Latest Arrivals...
Sakae/Ringyo (SR) Custom NOS Vintage 40T 118 BCD Inner Chainring
£35.00
✓ Original part - produced in the 1970s
✓ New old stock! Still unused after all these years
✓ Suitable for historic cycling events such as L'Eroica
✓ Worldwide shipping
Sakae/Ringyo (SR) Custom chainring, hailing from Japan and in production during the 1970s (yet still new & unused after all this time!). Made from aluminium and weighing in at 68 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, Anjou Velo, Velo Retro or another similar vintage cycling event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong chainring!
OVERVIEW
Production Era - 1970s
Country - Japanese
Material - Aluminium
Weight - 68 g
Stock Code - D-CRI8V
*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
Tooth Count - 40
Between Adjacent Bolt Holes - 69.4 mm
BCD - 118 BCD
Chainset Type - Double
Bolt Count - 5-Bolt
Chain Width - 3/32"
Intended Speed - 5 Speed, 6 Speed
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▼SHIPPING, TAXES & RETURNS
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We've been safely sending orders around the world since 2010. Orders are carefully packed, sent with tracking & insurance, and normally collected around midday on Tuesdays and Fridays. Larger items may occasionally require an extra day or two to prepare.
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.
EU orders under €150 (excluding shipping) - import VAT and the new €3 customs duty are paid as part of your order, so there's nothing further to pay on delivery.
EU orders over €150 (excluding shipping) - import fees are payable to the carrier before delivery, with nothing collected at checkout.
USA orders - import fees are collected at checkout for all orders to the USA, so there won’t be any surprise charges when your order arrives.
Other international orders - local import fees may apply and are not collected by us. Please check your country's import rules before purchasing.
Specialites TA Cyclotourist (CY205) Vintage 52T 50.4 / 74 BCD Outer Chainring
£21.25 £25.00
✓ Original part - in production from the 1950s to the 1980s
✓ Suitable for historic cycling events such as L'Eroica
✓ Professionally checked & cleaned
✓ Worldwide shipping
Specialites TA Cyclotourist chainring, hailing from France and in production from the 1950s to the 1980s. Made from aluminium and weighing in at 144 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, Anjou Velo, Velo Retro or another similar vintage cycling event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong chainring!
The chainring's been carefully cleaned, thoroughly checked by one of our mechanics and graded as good condition, but do take a good look at the detailed photos so you can see the cosmetic condition before you buy.OVERVIEW
Model ID - CY205
Production Era - 1950s - 1980s
Country - French
Material - Aluminium
Weight - 144 g
Stock Code - U-CRO12V
TECHNICAL INFO
Tooth Count - 52
Between Adjacent Bolt Holes - 29.6 mm
BCD - 50.4 / 74 BCD
Chainset Type - Double
Bolt Count - 5-Bolt / 6-Bolt
Chain Width - 3/32"
Intended Speed - 5 Speed, 6 Speed
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▼SHIPPING, TAXES & RETURNS
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We've been safely sending orders around the world since 2010. Orders are carefully packed, sent with tracking & insurance, and normally collected around midday on Tuesdays and Fridays. Larger items may occasionally require an extra day or two to prepare.
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.
EU orders under €150 (excluding shipping) - import VAT and the new €3 customs duty are paid as part of your order, so there's nothing further to pay on delivery.
EU orders over €150 (excluding shipping) - import fees are payable to the carrier before delivery, with nothing collected at checkout.
USA orders - import fees are collected at checkout for all orders to the USA, so there won’t be any surprise charges when your order arrives.
Other international orders - local import fees may apply and are not collected by us. Please check your country's import rules before purchasing.
Ofmega Vintage 52T 144 BCD Outer Chainring
£21.25 £25.00
✓ Original part - produced in the 1980s
✓ Lightweight for the era - just 67 grams
✓ Suitable for historic cycling events such as L'Eroica
✓ Professionally checked & cleaned
✓ Worldwide shipping
Ofmega chainring, hailing from Italy and in production during the 1980s. Made from aluminium and weighing in at 67 grams - pretty lightweight for an outer chainring 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, Anjou Velo, Velo Retro or another similar vintage cycling event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong chainring!
The chainring's been carefully cleaned, thoroughly checked by one of our mechanics and graded as good condition, but do take a good look at the detailed photos so you can see the cosmetic condition before you buy.OVERVIEW
Production Era - 1980s
Country - Italian
Material - Aluminium
Weight - 67 g
Stock Code - U-CRO8V
TECHNICAL INFO
Tooth Count - 52
Between Adjacent Bolt Holes - 84.6 mm
BCD - 144 BCD
Chainset Type - Double
Bolt Count - 5-Bolt
Chain Width - 3/32"
Intended Speed - 5 Speed, 6 Speed, 7 Speed
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▼SHIPPING, TAXES & RETURNS
-
We've been safely sending orders around the world since 2010. Orders are carefully packed, sent with tracking & insurance, and normally collected around midday on Tuesdays and Fridays. Larger items may occasionally require an extra day or two to prepare.
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.
EU orders under €150 (excluding shipping) - import VAT and the new €3 customs duty are paid as part of your order, so there's nothing further to pay on delivery.
EU orders over €150 (excluding shipping) - import fees are payable to the carrier before delivery, with nothing collected at checkout.
USA orders - import fees are collected at checkout for all orders to the USA, so there won’t be any surprise charges when your order arrives.
Other international orders - local import fees may apply and are not collected by us. Please check your country's import rules before purchasing.
Shimano Dura-Ace (GA-200) c.1975 Vintage 52T 130 BCD Outer Chainring
£34.00 £40.00
✓ Original part - produced in the 1970s
✓ Suitable for historic cycling events such as L'Eroica
✓ Professionally checked & cleaned
✓ Worldwide shipping
Shimano Dura-Ace chainring, hailing from Japan and dating back to 1975. Made from aluminium and weighing in at 102 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, Anjou Velo, Velo Retro or another similar vintage cycling event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong chainring!
The chainring's been carefully cleaned, thoroughly checked by one of our mechanics and graded as good condition, but do take a good look at the detailed photos so you can see the cosmetic condition before you buy.OVERVIEW
Model ID - GA-200
Production Era - 1970s
Country - Japanese
Material - Aluminium
Weight - 102 g
Stock Code - U-CRO7V
TECHNICAL INFO
Tooth Count - 52
Between Adjacent Bolt Holes - 76.4 mm
BCD - 130 BCD
Chainset Type - Double
Bolt Count - 5-Bolt
Chain Width - 3/32"
Intended Speed - 5 Speed, 6 Speed, 7 Speed
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▼SHIPPING, TAXES & RETURNS
-
We've been safely sending orders around the world since 2010. Orders are carefully packed, sent with tracking & insurance, and normally collected around midday on Tuesdays and Fridays. Larger items may occasionally require an extra day or two to prepare.
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.
EU orders under €150 (excluding shipping) - import VAT and the new €3 customs duty are paid as part of your order, so there's nothing further to pay on delivery.
EU orders over €150 (excluding shipping) - import fees are payable to the carrier before delivery, with nothing collected at checkout.
USA orders - import fees are collected at checkout for all orders to the USA, so there won’t be any surprise charges when your order arrives.
Other international orders - local import fees may apply and are not collected by us. Please check your country's import rules before purchasing.
Cicli Guadrini Pantographed Vintage 52T 144 BCD Outer Chainring
£38.25 £45.00
✓ Original part - produced in the 1980s
✓ Suitable for historic cycling events such as L'Eroica
✓ Professionally checked & cleaned
✓ Worldwide shipping
Cicli Guadrini chainring, hailing from Italy and in production during the 1980s. Made from aluminium and weighing in at 87 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, Anjou Velo, Velo Retro or another similar vintage cycling event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong chainring!
The chainring's been carefully cleaned, thoroughly checked by one of our mechanics and graded as good condition, but do take a good look at the detailed photos so you can see the cosmetic condition before you buy.OVERVIEW
Condition Notes - Pantograph enamel completely worn off as seen in photos
Production Era - 1980s
Country - Italian
Material - Aluminium
Weight - 87 g
Stock Code - U-CRO6V
TECHNICAL INFO
Tooth Count - 52
Between Adjacent Bolt Holes - 84.6 mm
BCD - 144 BCD
Chainset Type - Double
Bolt Count - 5-Bolt
Chain Width - 3/32"
Intended Speed - 5 Speed, 6 Speed, 7 Speed
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▼SHIPPING, TAXES & RETURNS
-
We've been safely sending orders around the world since 2010. Orders are carefully packed, sent with tracking & insurance, and normally collected around midday on Tuesdays and Fridays. Larger items may occasionally require an extra day or two to prepare.
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.
EU orders under €150 (excluding shipping) - import VAT and the new €3 customs duty are paid as part of your order, so there's nothing further to pay on delivery.
EU orders over €150 (excluding shipping) - import fees are payable to the carrier before delivery, with nothing collected at checkout.
USA orders - import fees are collected at checkout for all orders to the USA, so there won’t be any surprise charges when your order arrives.
Other international orders - local import fees may apply and are not collected by us. Please check your country's import rules before purchasing.
Sakae/Ringyo (SR) Royal Super Light Black Drilled NOS/NIB Vintage 51T 144 BCD Outer Chainring
£42.50 £50.00
✓ Original part - produced in the 1970s
✓ New old stock & still in the original packaging!
✓ Suitable for historic cycling events such as L'Eroica
✓ Worldwide shipping
Sakae/Ringyo (SR) Royal Super Light chainring, hailing from Japan and in production during the 1970s (yet still new & unused after all this time!). Made from aluminium and weighing in at 98 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, Anjou Velo, Velo Retro or another similar vintage cycling event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong chainring!
OVERVIEW
Production Era - 1970s
Country - Japanese
Material - Aluminium
Weight - 98 g
Stock Code - D-CRO5V
*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
Tooth Count - 51
Between Adjacent Bolt Holes - 84.6 mm
BCD - 144 BCD
Chainset Type - Double
Bolt Count - 5-Bolt
Chain Width - 3/32"
Intended Speed - 5 Speed, 6 Speed
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▼SHIPPING, TAXES & RETURNS
-
We've been safely sending orders around the world since 2010. Orders are carefully packed, sent with tracking & insurance, and normally collected around midday on Tuesdays and Fridays. Larger items may occasionally require an extra day or two to prepare.
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.
EU orders under €150 (excluding shipping) - import VAT and the new €3 customs duty are paid as part of your order, so there's nothing further to pay on delivery.
EU orders over €150 (excluding shipping) - import fees are payable to the carrier before delivery, with nothing collected at checkout.
USA orders - import fees are collected at checkout for all orders to the USA, so there won’t be any surprise charges when your order arrives.
Other international orders - local import fees may apply and are not collected by us. Please check your country's import rules before purchasing.
Sakae/Ringyo (SR) Royal LA-5 NOS Vintage 50T 144 BCD Outer Chainring
£38.25 £45.00
✓ Original part - produced in the 1970s
✓ New old stock! Still unused after all these years
✓ Suitable for historic cycling events such as L'Eroica
✓ Worldwide shipping
Sakae/Ringyo (SR) Royal LA-5 chainring, hailing from Japan and in production during the 1970s (yet still new & unused after all this time!). Made from aluminium and weighing in at 97 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, Anjou Velo, Velo Retro or another similar vintage cycling event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong chainring!
OVERVIEW
Production Era - 1970s
Country - Japanese
Material - Aluminium
Weight - 97 g
Stock Code - D-CRO4V
*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
Tooth Count - 50
Between Adjacent Bolt Holes - 84.6 mm
BCD - 144 BCD
Chainset Type - Double
Bolt Count - 5-Bolt
Chain Width - 3/32"
Intended Speed - 5 Speed, 6 Speed
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▼SHIPPING, TAXES & RETURNS
-
We've been safely sending orders around the world since 2010. Orders are carefully packed, sent with tracking & insurance, and normally collected around midday on Tuesdays and Fridays. Larger items may occasionally require an extra day or two to prepare.
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.
EU orders under €150 (excluding shipping) - import VAT and the new €3 customs duty are paid as part of your order, so there's nothing further to pay on delivery.
EU orders over €150 (excluding shipping) - import fees are payable to the carrier before delivery, with nothing collected at checkout.
USA orders - import fees are collected at checkout for all orders to the USA, so there won’t be any surprise charges when your order arrives.
Other international orders - local import fees may apply and are not collected by us. Please check your country's import rules before purchasing.
Simplex Vintage Clamp-On Downtube Shifters
£48.75 £65.00
✓ Original shifters - in production from the 1960s to the 1970s
✓ Suitable for historic cycling events such as L'Eroica
✓ Professionally checked & cleaned
✓ Worldwide shipping
Simplex downtube shifters, hailing from France and in production from the 1960s to the 1970s. Made from aluminium/plastic and weighing in at 87 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 a similar vintage event, these are fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong shifters!
The shifters have been carefully cleaned, thoroughly checked by one of our mechanics and graded as good condition, but do take a good look at the detailed photos so you can see the cosmetic condition before you buy.OVERVIEW
Production Era - 1960s & 1970s
Country - French
Material - Aluminium/Plastic
Weight - 87 g
Stock Code - U-S-C13V
TECHNICAL INFO
Fixing Type - Clamp-On
Shift Type - Friction
Speed - 5 Speed, 6 Speed
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▼SHIPPING, TAXES & RETURNS
-
We've been safely sending orders around the world since 2010. Orders are carefully packed, sent with tracking & insurance, and normally collected around midday on Tuesdays and Fridays. Larger items may occasionally require an extra day or two to prepare.
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.
EU orders under €150 (excluding shipping) - import VAT and the new €3 customs duty are paid as part of your order, so there's nothing further to pay on delivery.
EU orders over €150 (excluding shipping) - import fees are payable to the carrier before delivery, with nothing collected at checkout.
USA orders - import fees are collected at checkout for all orders to the USA, so there won’t be any surprise charges when your order arrives.
Other international orders - local import fees may apply and are not collected by us. Please check your country's import rules before purchasing.
Gian Robert Competition Gold Vintage Clamp-On Downtube Shifters
£37.50 £50.00
✓ Original shifters - in production from the 1970s to the 1980s
✓ Suitable for historic cycling events such as L'Eroica
✓ Professionally checked & cleaned
✓ Worldwide shipping
Gian Robert Competition Gold downtube shifters, hailing from Italy and in production from the 1970s to the 1980s. Made from aluminium/steel and weighing in at 70 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 a similar vintage event, these are fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong shifters!
The shifters have been carefully cleaned, thoroughly checked by one of our mechanics and graded as good condition, but do take a good look at the detailed photos so you can see the cosmetic condition before you buy.OVERVIEW
Production Era - 1970s & 1980s
Country - Italian
Material - Aluminium/Steel
Weight - 70 g
Stock Code - U-S-C10V
TECHNICAL INFO
Fixing Type - Clamp-On
Shift Type - Friction
Speed - 5 Speed, 6 Speed, 7 Speed
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▼SHIPPING, TAXES & RETURNS
-
We've been safely sending orders around the world since 2010. Orders are carefully packed, sent with tracking & insurance, and normally collected around midday on Tuesdays and Fridays. Larger items may occasionally require an extra day or two to prepare.
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.
EU orders under €150 (excluding shipping) - import VAT and the new €3 customs duty are paid as part of your order, so there's nothing further to pay on delivery.
EU orders over €150 (excluding shipping) - import fees are payable to the carrier before delivery, with nothing collected at checkout.
USA orders - import fees are collected at checkout for all orders to the USA, so there won’t be any surprise charges when your order arrives.
Other international orders - local import fees may apply and are not collected by us. Please check your country's import rules before purchasing.
Zeus Criterium / Nisi Vintage 28"/700c Tubular Road Rear Wheel
£123.75 £165.00
✓ Original vintage rear wheel - produced in the 1970s
✓ Lightweight for the era - just 960 grams
✓ Suitable for historic cycling events such as L'Eroica
✓ Professionally checked & serviced
✓ Worldwide shipping
Zeus Criterium / Nisi rear wheel, the hub hailing from Spain and in production during the 1970s. Made from aluminium and weighing in at 960 grams - pretty lightweight for a rear wheel 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 a similar vintage event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong wheel!
The wheel's been serviced, checked by one of our mechanics and graded as very good condition, but do take a good look at the detailed photos so you can see the cosmetic condition before you buy.OVERVIEW
Rim Condition - Very Good
Production Era - 1970s
Country - Spanish
Material - Aluminium
Weight - 960 grams
Stock Code - U-W-SR1V
TECHNICAL INFO
Rim Size - 28"/700c Tubular
Bike Type - Road
Drilling - 36 Hole
Spacing OLD - 126 mm
Speed - 5 Speed, 6 Speed, 7 Speed
Sprocket Fitting - Screw On (English/ISO: 1.375 x 24 TPI)
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▼SHIPPING, TAXES & RETURNS
-
We've been safely sending orders around the world since 2010. Orders are carefully packed, sent with tracking & insurance, and normally collected around midday on Tuesdays and Fridays. Larger items may occasionally require an extra day or two to prepare.
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.
EU orders under €150 (excluding shipping) - import VAT and the new €3 customs duty are paid as part of your order, so there's nothing further to pay on delivery.
EU orders over €150 (excluding shipping) - import fees are payable to the carrier before delivery, with nothing collected at checkout.
USA orders - import fees are collected at checkout for all orders to the USA, so there won’t be any surprise charges when your order arrives.
Other international orders - local import fees may apply and are not collected by us. Please check your country's import rules before purchasing.
Gipiemme Low Flange NOS Vintage 36/36h Hubs
£82.50 £110.00
✓ Original part - produced in the 1980s
✓ New old stock!
✓ Suitable for historic cycling events such as L'Eroica
✓ Made in Italy
✓ Worldwide shipping
Gipiemme Low Flange hubs, in production during the 1980s (yet still new & unused after all this time!). Made from aluminium/steel and weighing in at 598 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 hubs!
OVERVIEW
Bearing / Race Condition - New Old Stock*
Production Era - 1980s
Country - Italian
Material - Aluminium/Steel
Weight - 598 grams
Stock Code - D-HU-P2V
*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
Drilling (F/R) - 36/36 Hole
Spacing (O.L.D.) (F/R) - 100 mm /126 mm
Speed - 5 Speed, 6 Speed, 7 Speed
Sprocket Fitting - Screw-On (Italian 1.378 x 24 TPI)
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▼SHIPPING, TAXES & RETURNS
-
We've been safely sending orders around the world since 2010. Orders are carefully packed, sent with tracking & insurance, and normally collected around midday on Tuesdays and Fridays. Larger items may occasionally require an extra day or two to prepare.
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.
EU orders under €150 (excluding shipping) - import VAT and the new €3 customs duty are paid as part of your order, so there's nothing further to pay on delivery.
EU orders over €150 (excluding shipping) - import fees are payable to the carrier before delivery, with nothing collected at checkout.
USA orders - import fees are collected at checkout for all orders to the USA, so there won’t be any surprise charges when your order arrives.
Other international orders - local import fees may apply and are not collected by us. Please check your country's import rules before purchasing.
Ofmega City Vintage Double Chainset
£41.25 £55.00
✓ Original part - produced in the 1980s
✓ Made in Italy
✓ Professionally Checked & Cleaned
✓ Worldwide shipping
Ofmega City chainset, in production during the 1980s. Made from aluminium/steel/plastic and weighing in at 983 grams. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike too.
The chainset's been carefully cleaned, thoroughly checked by one of our mechanics and graded as ok condition, but do take a good look at the detailed photos so you can see the cosmetic condition before you buy.
OVERVIEW
Chainring Condition - Good
Condition Notes - Crack in plastic on non-drive side - not structural as this is just an outer casing.
Production Era - 1980s
Country - Italian
Material - Aluminium/Steel/Plastic
Weight - 983 grams
Stock Code - U-CS6V
TECHNICAL INFO
Chainring Count - Double
Tooth Count - 52/42
Chain Width - 3/32"
BCD - 144 BCD
Speed* - 5 Speed, 6 Speed, 7 Speed
Crank Length - 170 mm
Pedal Threads - Standard (9/16" x 20 TPI)
Bottom Bracket Type - Square Taper
*See help section.
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▼SHIPPING, TAXES & RETURNS
-
We've been safely sending orders around the world since 2010. Orders are carefully packed, sent with tracking & insurance, and normally collected around midday on Tuesdays and Fridays. Larger items may occasionally require an extra day or two to prepare.
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.
EU orders under €150 (excluding shipping) - import VAT and the new €3 customs duty are paid as part of your order, so there's nothing further to pay on delivery.
EU orders over €150 (excluding shipping) - import fees are payable to the carrier before delivery, with nothing collected at checkout.
USA orders - import fees are collected at checkout for all orders to the USA, so there won’t be any surprise charges when your order arrives.
Other international orders - local import fees may apply and are not collected by us. Please check your country's import rules before purchasing.
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▼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.