Ofmega Competizione (1100) Vintage Double Chainset

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

Ofmega Competizione chainset, in production from the 1970s to the 1980s. Made from aluminium and weighing in at 522 grams - incredibly lightweight for a chainset of this 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 chainset!

The chainset'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.


Body Condition - Good
Chainring Condition - OK
Model ID - 1100
Condition Notes - T.A Outer ring, original inner
Production Era - 1970s & 1980s
Country - Italian
Material - Aluminium
Weight - 522 grams
Stock Code- U-CS1V


Chainring Count - Double
Tooth Count - 52/42
Chain Width - 3/32"
BCD - 144 BCD
Speed* - 5 Speed, 6 Speed
Crank Length - 170 mm
Pedal Threads - Standard (9/16" x 20 TPI)
Bottom Bracket Type - Square Taper

*See help section.


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).


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.