Bicycle Mechanics - Btm.Bracket size?........

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freeranger

05-27-07, 03:56 PM

I know I can take it apart & it should be printed on the btm bracket, but thought I'd have one ready so I can slap it back together after taking it apart. 1998 GT Timberline--square taper btm.bracket-anyone know the size--I think it is a 68 x 113, but I'm not positive. Doesn't sound real great after todays ride-may or may not last thru this season.

Antipodes

05-27-07, 04:09 PM

May be oversized 73mm, but most likely 68mm...

MudPie

05-27-07, 04:14 PM

When in doubt, you can measure:

a) width of bottom bracket shell - most likely, it will either be 68 or 73mm.

b) length of spindle (take off the crank arms). This is a little tricky since you probably won't have direct access to the spindle ends with a ruler. If you have a pair of calipers, then you're good to go. If you only have a ruler, you can have someone hold straight edges against the end of the spindle and you can measure the distance between the two straight edges.