Bicycle Mechanics - Bottom Brackets

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Kev
04-29-03, 03:46 PM
I'm converting my one road bike to Shimano 105, I got the 105 crankset, FD, RD etc.. I forgot to get the BB when I ordered everything else. I have a XT BB sitting in my garage, it has the octa-spline which I believe is the same as the road shimano BB, but the width of it is 118 vs the 118.5, will this work? Or should I just go to my LBS and get the correct BB?

Rev.Chuck
04-29-03, 04:06 PM
No. The depth of the splines is different. The depth of the splining in the crank(105) is about half the depth of the splining on a XT bb. Also if your 105 is double then you need the 109 bb any way.
Kev
04-29-03, 04:38 PM
It's a tripple so should be 118.5 I believe.. oh well atleast BB are inexpensive, I figured was worth a shot.

Rev.Chuck
04-29-03, 04:44 PM
Yep, it is 118
Kev
04-29-03, 04:47 PM
Thanx for the help rev.chuck. I figure if I don't ask questions I'll never learn.
Hopefuly will get my old bike built up before end of may. Still need to finalize teh paint job.
D*Alex
04-29-03, 05:40 PM
FWIW, you are better off with an Ultegra BB. Those 105 BB's don't last long for me.