What size are BB90 bearings?
37mm OD
The BB90/95 standard is used by Trek on many frames. Two sealed bearings (37mm OD) are pressed directly in to the frame’s bottom bracket shell. A step is molded in to the frame for the bearings to seat against.
What cranks work with BB90?
Trek BB90/95 frames do not have bearing retianer clips. Compatible with 24mm or 24/22mm spindle cranks only. Uses two sealed bearings (37mm OD) which are pressed into the frame and stop against a raised step built into the frame’s bottom bracket shell. No snap rings are used.
Is BB90 a pressfit?
Park Tool describes BB90 bearings as “a mild press fit” — they typically don’t require as much force to insert as a conventional press-fit and, in some frames, the bearings will actually slip in by hand.
How long should a BB90 last?
Simple rule is (unless you’re starting a long trip) “if it ain’t broke don’t fix it”. Do normal maintenance, keep things properly lubed and your BB should last for another 4,000 miles or more.
What kind of bearings are in Trek BB90?
This bearing kit is for use on bicycles that use the BB90 standard – typically these are Trek. 6805 (61805) bearings at the top end of the size range, these do not come boxed and are individually measured for size. The bearings will either be SKF, NTN, FAG, NSK or KOYO.
What’s the difference between a BB90 repair kit and the BB90 standard kit?
What’s the difference between a BB90 Repair Kit and the BB90 Standard Kit? Short Answer: The Standard Kit uses VibraTite530while the Repair Kit uses VibraTite538.
What to do if your bearings are loose on your bike?
If a bearing or both bearings are loose in the frame bottom bracket shell while you are riding and/or can be installed or removed by hand with little effort when the crank has been removed from the bike, you need our REPAIR KIT.
What kind of bearings do Trek frames use?
Long Answer: Many manufacturers, including Trek itself, are marketing “0.1mm oversize bearings” as a solution to the problem of bearing creak and bearing retention in Trek frames with bottom bracket bearing socket wear and for frames Trek admits might have a manufacturing variance that effects bearing fit.
