BB90 to a BB92
08-22-17, 03:41 PM
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BB90 to a BB92
Hey guys just a quick question. I have a 2008 Trek Madone 5.2 Pro and I need to replace the bottom bracket. Trek uses BB90's. Im looking to buy one from Chain Reaction Cycles, but I can only find BB92 road press. Does anyone know if that will fit. I called my local shop but they never heard of a BB92. Thanks guys
08-22-17, 03:59 PM
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Look here - Complete guide to bottom brackets - BikeRadar USA
Instead of having cartridge bearings that were pressed into aluminium cups that were then threaded into the frame, Trek eliminated the middle man and pressed the bare bearings directly into the frame.
08-22-17, 04:38 PM
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A BB90 is a Trek road bottom bracket. It simply uses bearings pressed in, one on each side.
BB92 is a mountain bike shell width. Honestly, the 2 mm is simply a slight spacer difference.
What you need to do is identify which crank you have...24mm both bear sides Shimano...24/22 for Sram. This determines which bearing set you need to replace with your bottom bracket.
Enduro bearings are good quality...angular contact...and not expensive.
See here:
Wheels Mfg - BB90/95 Replacement Parts
For installation:
https://www.parktool.com/blog/repair-help/
BB92 is a mountain bike shell width. Honestly, the 2 mm is simply a slight spacer difference.
What you need to do is identify which crank you have...24mm both bear sides Shimano...24/22 for Sram. This determines which bearing set you need to replace with your bottom bracket.
Enduro bearings are good quality...angular contact...and not expensive.
See here:
Wheels Mfg - BB90/95 Replacement Parts
For installation:
https://www.parktool.com/blog/repair-help/
Last edited by Campag4life; 08-22-17 at 04:48 PM.
08-22-17, 06:20 PM
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Thanks guys very informative. I think I might just wait and spring for a new groupset.
08-22-17, 06:27 PM
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08-22-17, 06:59 PM
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08-22-17, 08:20 PM
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Hey guys just a quick question. I have a 2008 Trek Madone 5.2 Pro and I need to replace the bottom bracket. Trek uses BB90's. Im looking to buy one from Chain Reaction Cycles, but I can only find BB92 road press. Does anyone know if that will fit. I called my local shop but they never heard of a BB92. Thanks guys
