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Just a thought as I could do with a lower gear or two for Rourke's Ride in October. Rather than buy a cassette with a 28 tooth sprocket I was wondering if I could get a smaller chain ring. Currently 34 on my Ultegra (110mm BCD). Is there anyone doing a 32 or 30 even? Or would they be too small for the ring bolt diameter. I have had a search but nothing smaller than 33 that I can find. I think I'm out of luck!

Ta  20

4 comments

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cat1commuter [1421 posts] 5 years ago
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Sorry, 33 is the smallest number of teeth which will fit on a 110 BCD crank. Smaller than that and the chain starts touching the chainring bolts. (Likewise 38 teeth is the smallest chainring which will fit on 130 BCD cranks.)

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bikeandy61 [524 posts] 5 years ago
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Cheers Cat 1 - I had come to the conclusion that this was probably the case. *ugger!

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Fringe [1047 posts] 5 years ago
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best bet is to fit a larger cassette, and long cage rear mech, oh and you'll prob need a new chain... mmm. gets exspensive dun'it  39

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dave atkinson [6208 posts] 5 years ago
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Candy Cranks do a 32T in 110bcd, or so they claim:

http://candycranks.bigcartel.com/product/mandala-dual-bcd-chainring

never seen them in the UK though