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Old 10-19-06, 03:25 PM   #1
jonbth
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Bottom bracket size

I bought a 2006 Trek Elite 9.8 frame and need to find out the bottom bracket size. I know the shell length is 68. I tried a 113 wide spindle and the large chainring is almost touching the frame (chainstay). I was wondering if 118 is a common mountain bike size. I searched a few posts and it seemed to indicate the 118 was a road bike length spindle.
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Old 10-19-06, 04:02 PM   #2
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Quote:
Originally Posted by jonbth
I bought a 2006 Trek Elite 9.8 frame and need to find out the bottom bracket size. I know the shell length is 68. I tried a 113 wide spindle and the large chainring is almost touching the frame (chainstay). I was wondering if 118 is a common mountain bike size. I searched a few posts and it seemed to indicate the 118 was a road bike length spindle.
i would have thought 113 was more common? my road bike is 111. i was under the impression 118 was rather wide, but if that is what you need...

was your 113 set-up symmetrical in relation of the cranks to the stays? could you space the right cup out?
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Old 10-19-06, 07:30 PM   #3
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Quote:
Originally Posted by jonbth
I bought a 2006 Trek Elite 9.8 frame and need to find out the bottom bracket size. I know the shell length is 68. I tried a 113 wide spindle and the large chainring is almost touching the frame (chainstay). I was wondering if 118 is a common mountain bike size. I searched a few posts and it seemed to indicate the 118 was a road bike length spindle.
Almost touching - how much space do you actually have, and what crank/chainring are you using? The OCLV frames are pretty stiff, so they can handle closer tolerances because the frame won't deflect as much. The best thing to do is contact Trek directly and ask what the recommended spindle size is for your chainring/crank. Since pretty much everyone has gone to the external bearing cranks, there doesn't seem to be a BB spindle to measure the way there used to be.
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Old 10-20-06, 02:03 AM   #4
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I have about 4mm clearance and am using the standard 44 32 22 isis splined crank. The chain doesn't hit but it's really close.
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Old 10-20-06, 07:29 AM   #5
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Might be 118. A lot of the Treks that come into my shop run a 124 spindle...
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