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bottom bracket size- Trek 2100

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bottom bracket size- Trek 2100

Old 04-30-12, 08:10 AM
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bottom bracket size- Trek 2100

I've got a Trek 2100 (late 90s model), very similar to this one with broken crank.

So, I decided to do a small upgrade and got an octalink 105 crankset, and am now looking for an octalink bottom bracket. The catch- I cannot measure the size until I get back (the bike is 1000s km away). However, it seems there are only 2 standard BB sizes- English and French/Italian.

Which one should I choose? Should I better wait to get back and have a look?
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Old 04-30-12, 08:45 AM
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Octalink bottom brackets come in only two length, 109 mm for a double crank and 118 mm for a triple so pick the right length to match your crank. Your Trek is English threaded so there is no ambiguity there at all. For your 105 crank you need a 5500 or 6500 series bottom bracket which have the V-1 series splines. You must not get a V-2 (MTB type).

BTW, Italian and French are two different threading standards. Shimano does make Italian threaded bottom brackets (you don't need it) but, AFAIK, makes no French threaded ones at all and may never have.
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Old 04-30-12, 02:38 PM
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Shimano did make French bottom brackets. I've seen Dura Ace. They don't now and they never will again.
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