Can anyone tell me how to measure the size of bolts used on my bike? I'll be replacing some with aluminum or titanium and I'm not sure which size to order. I know it goes something like M6 X 125 or something but it differs from part to part. Also, are there any places that sell them for cheap? I'm thinking that maybe a non specific bike source (like hardware site) might sell them cheaper because they're just simple bolts (i.e. not SRP kits.) Thanks.

Your best bet is to do a search this has been asked a few times.

As for how to measure read this article by Nino.

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