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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 01-28-11, 10:32 AM   #1
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Determining chain width by measuring teeth

I need to replace the chain on my winter commuter (Bianchi BuSS) that I recently got on Craigslist. I don't really trust that the bike currently has the right sized chain (1/8 vs 3/32) Is it possible to determine the correct chain width by measuring the teeth on the drivetrain?
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Old 01-28-11, 11:18 AM   #2
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Yes. Just use some calipers or a ruler and measure them. A 3/32" chainring should be about 2mm, and a 1/8" chainring should be about 3mm. The difference may seem small, but at this scale it should be pretty obvious. Make sure you're measuring the tooth, and not the ring or the tapered edge of the tooth.

If you have another bike with a known chainring size, you could try comparing to that.
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Old 01-28-11, 12:28 PM   #3
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Well, if the bike is rideable, then it has to be the right size. A 3/32" chain will not work with a 1/8" drive train. All other combinations are "correct".
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Old 01-28-11, 03:06 PM   #4
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Just google some pics and eyeball it. It's pretty easy to tell.
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