New crank set, but what length bottom bracket??

Darra8
Darra8 Posts: 721
edited August 2009 in MTB workshop & tech
Hi Guys,

I'm quite sure this has been asked many times before, but i have looked for the right answers, but get different lengths.

At the moment i have a 113mm BB and my acera cranks are, after tightening them up, are almost touching the BB housing. This is also stopping me getting the front mech to go far enough in to drop the chain onto the inner ring. I am also thinking of upgrading the crank to alivio at the same time, but have looked on different websites and one says 113 and the other says 118 BB lengths. As i already have 113 and it would seem that it's a little short, maybe 118 would be better. But the questions is will 5mm longer be enough, should i go for 121/122?

Hope someone can help.

Steve
40 year old pussy who "still" hates the thought of falling off!!

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