Latest Arrivals...

Ofmega Gran Premio Vintage 36h Front Hub

£28.00 £35.00

✓ Original part - produced in the 1980s
✓ Suitable for historic cycling events such as L'Eroica
✓ Made in Italy
✓ Worldwide shipping

Ofmega Gran Premio front hub, in production during the 1980s. Made from aluminium/steel and weighing in at 228 grams. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike too.

If you're taking part in L'Eroica or any other vintage event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong front hub!

OVERVIEW

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

Mavic 500 Vintage 36h Front Hub

£32.00 £40.00

✓ Original part - in production from the 1970s to the 1980s
✓ Suitable for historic cycling events such as L'Eroica
✓ Made in France
✓ Worldwide shipping

Mavic 500 front hub, in production from the 1970s to the 1980s. Made from aluminium/steel and weighing in at 242 grams. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike too.

If you're taking part in L'Eroica or any other vintage event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong front hub!

OVERVIEW

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

Miche Superfast Vintage 36h Front Hub

£28.00 £35.00

✓ Original part - in production from the 1980s to the 1990s
✓ Made in Italy
✓ Worldwide shipping

Miche Superfast front hub, in production from the 1980s to the 1990s. Made from aluminium/steel and weighing in at 227 grams. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike too.

OVERVIEW

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

Shimano 105 (HB-1050) Vintage 32h Front Hub

£26.00 £32.50

✓ Original part - in production from the 1980s to the 1990s
✓ Made in Japan
✓ Worldwide shipping

Shimano 105 front hub, in production from the 1980s to the 1990s. Made from aluminium/steel and weighing in at 221 grams - pretty lightweight for a front hub at that time. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike too.

OVERVIEW

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

Campagnolo Victory (422) Vintage 36h Front Hub

£44.00 £55.00

✓ Original part - produced in the 1980s
✓ Suitable for historic cycling events such as L'Eroica
✓ Made in Italy
✓ Worldwide shipping

Campagnolo Victory front hub, made in Italy and in production during the 1980s. Made from aluminium/steel and weighing in at 148 grams - incredibly lightweight for a front hub at that time. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike too.

If you're taking part in L'Eroica or any other vintage event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong front hub!

OVERVIEW

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

Campagnolo Nuovo Tipo (1251) Vintage 36h Front Hub

£52.00 £65.00

✓ Original part - in production from the 1960s to the 1980s
✓ Suitable for historic cycling events such as L'Eroica
✓ Made in Italy
✓ Worldwide shipping

Campagnolo Nuovo Tipo front hub, made in Italy and in production from the 1960s to the 1980s. Made from aluminium/steel and weighing in at 228 grams. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike too.

If you're taking part in L'Eroica or any other vintage event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong front hub!

OVERVIEW

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

Campagnolo Gran Sport (1006) Vintage 32h Front Hub

£60.00 £75.00

✓ Original part - produced in the 1950s
✓ Suitable for historic cycling events such as L'Eroica
✓ Made in Italy
✓ Worldwide shipping

Campagnolo Gran Sport front hub, made in Italy and in production during the 1950s. Made from aluminium/steel and weighing in at 213 grams - pretty lightweight for a front hub at that time. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike too.

If you're taking part in L'Eroica or any other vintage event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong front hub!

OVERVIEW

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

Shimano Deore LX (HB-M560) c.1993 NOS Classic 32h Front Hub

£47.50 £50.00

✓ Original part - produced in the 1990s
✓ New old stock! Still unused after all these years
✓ Made in Japan
✓ Worldwide shipping

Shimano Deore LX front hub, dating back to 1993 (yet still new & unused after all this time!). Made from aluminium/steel and weighing in at 219 grams - pretty lightweight for a front hub at that time. A fine choice for keeping your classic bike authentic, but also great for any other compatible bike too.

OVERVIEW

*New old stock items may have marks from storage over the years, and as we often have multiples they can vary from piece to piece, but they are always genuine new & unused items.

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

Suntour XCD 6000 (HB-XD00) NOS Vintage 36/36h Hubs

£76.00 £80.00

✓ Original part - in production from the 1980s to the 1990s
✓ New old stock! Still unused after all these years
✓ Made in Japan
✓ Worldwide shipping

Suntour XCD 6000 hubs, in production from the 1980s to the 1990s (yet still new & unused after all this time!). Made from aluminium/steel and weighing in at 719 grams. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike too.

OVERVIEW

*New old stock items may have marks from storage over the years, and as we often have multiples they can vary from piece to piece, but they are always genuine new & unused items.

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

Miche Primato Pistard Large Flange Pista NOS/NIB Classic 36/36h Hubs

£92.00 £115.00

✓ Original part - in production from the 1990s to the 2000s
✓ New old stock! Still in the original packaging!
✓ Made in Italy
✓ Worldwide shipping

Miche Primato Pistard hubs, in production from the 1990s to the 2000s (yet still new & unused after all this time!). Made from aluminium/steel and weighing in at 567 grams. A fine choice for keeping your classic bike authentic, but also great for any other compatible bike too.

OVERVIEW

*New old stock items may have marks from storage over the years, and as we often have multiples they can vary from piece to piece, but they are always genuine new & unused items.

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

Shimano Exage (RM50 / FH-HG50) c.1992 NOS Classic 32/32h Hubs

£55.00

✓ Original part - produced in the 1990s
✓ New old stock! Still unused after all these years
✓ Made in Japan
✓ Worldwide shipping

Shimano Exage hubs, dating back to 1992 (yet still new & unused after all this time!). Made from aluminium/steel and weighing in at 678 grams. A fine choice for keeping your classic bike authentic, but also great for any other compatible bike too.

OVERVIEW

*New old stock items may have marks from storage over the years, and as we often have multiples they can vary from piece to piece, but they are always genuine new & unused items.

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

Unbranded Steel Vintage 1" Threaded JIS Headset

£16.00 £20.00

✓ Original part - produced in the 1970s
✓ Suitable for historic cycling events such as L'Eroica
✓ Professionally Checked & Cleaned
✓ Worldwide shipping

Unbranded Steel headset, in production during the 1970s. Made from steel and weighing in at 136 grams. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike too.

If you're taking part in L'Eroica or any other vintage event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong headset!

OVERVIEW

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

Unbranded Steel Vintage 1" Threaded Headset

£28.00 £35.00

✓ Original part - produced in the 1970s
✓ Suitable for historic cycling events such as L'Eroica
✓ Professionally Checked & Cleaned
✓ Worldwide shipping

Unbranded Steel headset, in production during the 1970s. Made from steel and weighing in at 136 grams. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike too.

If you're taking part in L'Eroica or any other vintage event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong headset!

OVERVIEW

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

Shimano Deore DX (HP-M651) c.1990 NOS Classic 1 1/8" Threaded Headset

£55.00

✓ Original part - produced in the 1990s
✓ New old stock! Still unused after all these years
✓ Made in Japan
✓ Worldwide shipping

Shimano Deore DX headset, dating back to 1990 (yet still new & unused after all this time!). Made from aluminium/steel and weighing in at 193 grams. A fine choice for keeping your classic bike authentic, but also great for any other compatible bike too.

OVERVIEW

*New old stock items may have marks from storage over the years, and as we often have multiples they can vary from piece to piece, but they are always genuine new & unused items.

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

Unbranded Steel Vintage 1" Threaded Headset

£24.00 £30.00

✓ Original part - produced in the 1970s
✓ Suitable for historic cycling events such as L'Eroica
✓ Professionally Checked & Cleaned
✓ Worldwide shipping

Unbranded Steel headset, in production during the 1970s. Made from steel and weighing in at 180 grams. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike too.

If you're taking part in L'Eroica or any other vintage event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong headset!

OVERVIEW

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

YST Steel Vintage 1" Threaded Headset

£20.00 £25.00

✓ Original part - in production from the 1970s to the 1980s
✓ Suitable for historic cycling events such as L'Eroica
✓ Made in Taiwan
✓ Professionally Checked & Cleaned
✓ Worldwide shipping

YST Steel headset, in production from the 1970s to the 1980s. Made from steel and weighing in at 170 grams. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike too.

If you're taking part in L'Eroica or any other vintage event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong headset!

OVERVIEW

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

R.F.G Crante Luxe No. 16 Vintage 1" Threaded Headset

£24.00 £30.00

✓ Original part - produced in the 1970s
✓ Suitable for historic cycling events such as L'Eroica
✓ Made in France
✓ Professionally Checked & Cleaned
✓ Worldwide shipping

R.F.G Crante Luxe No. 16 headset, in production during the 1970s. Made from steel and weighing in at 138 grams. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike too.

If you're taking part in L'Eroica or any other vintage event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong headset!

OVERVIEW

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

Ofmega City Vintage Double Chainset

£44.00 £55.00

✓ Original part - produced in the 1980s
✓ Made in Italy
✓ Professionally Checked & Cleaned
✓ Worldwide shipping

OVERVIEW

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

▼HELP SECTION

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Tooth count - the number of teeth on the chainring(s), the higher the number the harder the gear.

Chain width - some single chainsets will only work with a thicker 1/8” chain, all other chainsets take a standard 3/32” chain.

BCD - the distance between the chainring bolts, you’ll need this if you want to change rings.

Speed* - the number of cogs at the back the chainset was originally designed to be used with. You can happily mix different speeds, it’s just worth noting that the bigger the difference the more likely you are to experience shifting issues. As a rule of thumb, one or two speed difference shouldn’t be a problem, unless the chainset is for 10 speed or higher - these usually need the correct speed chain to avoid problems.

Pedal threads - this is usually stamped on the pedals. The standard thread is 9/16” x 20 tpi which almost all bikes use, the exception being older French bikes, bikes with one-piece cranks and Shimano’s Dyna Drive system - these are not interchangeable.

Bottom bracket type - ‘square taper’ bottom brackets, as the name suggests, have a square shaped axle that slots into the chainset. These are interchangeable between brands as long as you stick to the same axle length & profile. With all the other brand specific systems such as Shimano’s Octalink you must stick to the matching bottom bracket type.

Campagnolo Gran Sport (1012/1) Vintage Rear Mech

£100.00 £125.00

✓ Original part - produced in the 1950s
✓ Suitable for historic cycling events such as L'Eroica
✓ Made in Italy
✓ Professionally checked & cleaned
✓ Worldwide shipping

If you're taking part in L'Eroica or any other vintage event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong rear mech!

OVERVIEW

TECHNICAL INFO

▼SHIPPING, TAXES & RETURNS

---

We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 working days but larger items can often take a little longer to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import duties to pay upon receipt (even with the new post-Brexit trade deals, some countries may still charge you import VAT & clearance fees, so please bear this in mind when purchasing).

▼HELP SECTION

---

Shifting system - friction means your gear levers don't click when you change gear, when they do click it's referred to as indexed shifting. If you have indexed gear levers they must use the same system as the rear derailleur, if you're using friction levers you can mix and match.

*Speed - the number of cogs at the back the derailleur was designed to be used with. This is important with indexed shifting, but with friction shifters you can in theory run any rear mech with any number of cogs, but you are more likely to have issues running high numbers of cogs with mechs from earlier eras.

Max cog size - the amount of teeth on the largest cog of your freewheel/cassette can be no greater than this to work with this derailleur.

Chain wrap - subtract the size of your smallest rear cog from your biggest, then do the same with your chainrings, add the 2 numbers together and you have your chain wrap.

Chain width - generally speaking, derailleurs designed for more than 3 speed use will fit a standard 3/32'' chain, the exception being some Cyclo & Simplex models from around the mid 1900s.