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Bottom brackets(2 posts)

Bottom bracketsecna
Oct 18, 2003 6:32 PM
I have a hybrid with mostly MTB components, and am looking to switch to mostly road. It seems like MTB bottom brackets are 68x113 and the ones that match any crankset I'm looking at are 68x118. Is the 68 all that matters as far as fitting my frame go and I just use the 118 for the road crank or are both numbers related to the frame?
re: Bottom bracketsrussw19
Oct 18, 2003 7:12 PM
First, you need to get the right bottom bracket for both your frame and crankset.

The first number in a bottom bracket size is the shell width. That is the width in milimeters of the actual bottom bracket shell of your frame. If your old one is 68mm then that's what you get. English thread bottom brackets come in two sizes, 68mm and 73mm, so make sure first which one you have.

The next number is the spindle length. That is dependent on your crank. The best way to find out what you need is to look up your crank on the web and see what the manufacturer tells you to use. Without knowing what crank you are using, no one here can tell you what spindle length to use.

If you are unsure, take your bike to the local shop and have them tell you what you need.... that's why they are there.