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bottom bracket sizing guide?

se99pajse99paj Posts: 22
edited August 2013 in MTB beginners
So I decided to try and build my own mountain bike, I managed to get a frame and a few other bits off eBay, I'm going to use some parts from an old bike to try and keep costs down.

But I'm going to need a new bottom bracket and I'm a bit confused, how do you know what length it needs to be? I know the shell needs to be 68mm but what about the spindle? Some websites make it sound like trial and error.

Is it going to make more sense to just take it down to my local bike shop?

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