JUST THE FACTS:
BB90 is the road bike version of Trek's proprietary Direct-in-frame bottom bracket system. No cups or extra hardware required. The Trek BB90 bottom bracket bearing replacement presses directly into the frame. These Shimano bearings work with all Shimano HollowTech crank systems.
Our zero-drag bearing shields are included with your purchase.
How do I know if my bike needs a Repair Kit or a Standard Kit?
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.
If the bearings are snug in your frame’s bottom bracket shell, and you need to knock the bearings out mechanically, and need to use a press to install the bearings, order our STANDARD KIT.
What’s the difference between a BB90 Repair Kit and the BB90 Standard Kit?
The Standard Kit uses VibraTite530 while the Repair Kit uses VibraTite538. Both of these compounds secure the bearings in place during use while allowing for simple removal and servicing by standard means when necessary and DO NOT have any effect on your frame’s warranty whatsoever. The 530 works better in tight spots while the 538 works best with a looser fit, so please order the correct kit for the best results.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. Either way, there is no way to know if their 0.1mm oversize is big enough or, as will be the case for most bikes, is actually way too big. Believe us when we say that 0.1mm is gigantic. Isn’t bigger a good thing? Answer: Only if it’s the right size, because bearings that fit too tight will not run smoothly, in many cases barely turning, and this means not just wattage-sucking, dismal performance, but a drastic reduction in bearing service life.
This is why we only use high-quality, standard size Shimano bearings with the right retaining compound and hardware to solve problems with Trek BB90 bikes.
ABOUT OUR BEARING CHOICES:
Ceramitech Bearings: Our Si3n4 hybrid BB90 ceramic bearings feature ultra-spherical silicon nitride balls matched to SAE 52100 chrome steel bearing races that have been processed with additional heat treatment and polishing steps. The result is a hybrid-ceramic bearing that lasts longer than any steel bearing with spin performance no steel bearing can rival. We’re so confident in the durability of our Ceramitech bearings that we back them with a Lifetime Bearing Exchange warranty. These Trek BB90 bearings feature mid-contact seals for extreme performance and durability. Each bearing comes lubricated with Kluber IsoFlex Topas NB 52. Lifetime Warranty.
WS2 Coated Ceramitech Bearings: We took our amazing Ceramitech bearings and added an extremely durable, tungsten disulfide (WS2) coating that has a 0.03 coefficient of friction---which means it’s slicker than Teflon, graphite, and even molybdenum disulfide. WS2 has an affinity for oils and greases, which means it maintains a hydrodynamic layer of lubricant where it’s needed most. The result is astonishing spin performance and increased endurance. These Trek BB90 bearings feature mid-contact seals for extreme performance and durability. Each bearing comes lubricated with Kluber Isoflex Topas NB52. Lifetime Warranty.
ABEC-7 Steel Bearings: Crafted from SAE 52100 chrome steel, our BBInfinite ABEC-7 (ISO 492, Class 4) bearings are so buttery that you’d have to buy our Ceramitechs to find anything better. These Trek BB90 bearings feature mid-contact seals for extreme performance and durability. Each bearing comes lubricated with Kluber IsoFlex Topas NB52 or Koyo. 1-Year Bearing Exchange Warranty.
WS2: 38g | CERAMITECH: 39g | ABEC-7 SS: 41g
Frame Width: BB90
Frame Diameter: 37mm
Spindle Diameter: 24mm