Single Speed chainring size question- Mtbr.com
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  1. #1
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    Single Speed chainring size question

    Ok....I may be over-thinking this. It's been known to happen. I bought a nos single speed crankset with a blackspire 36t chainring, which is a little too large for the bike in question. I need a 32t, but when I started looking around I noticed there were some variances in bcd in what's available. I'm not quite sure what I need. Heck, would someone please tell me what this whole bcd thing means anyway? This is now on my Trek 69er, as wasn't a fan of the bontrager crankset that came on it. I love the 36T blackspire ring I have....great quality. But I'll never use it. Thanks for your help!


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  3. #3
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    I'm pretty sure the BCD is the distance between the bolts and varies between manufacturers. You can buy a Blackspire 32 tooth. Those cranks look like a M950 or M952 but that spider doesn't look like it's per manufacturer specs. You'll have to see what the BCD of that chainring is prior to swapping it out. Take it in to your LBS and they will measure it for you, or you can do it yourself.
    http://www.sjscycles.co.uk/bolt-circ...-artlbcdchart/

  4. #4
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    It says on the ring it's a 112mm BCD. The smallest ring you can get for that crank is 34t.

    --sParty
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  5. #5
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    Thanks guys. That helps.

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