2PCS Hybrid 24377-2RS Ceramic Ball Bearing 24X37X7mm MR2437 for BB90

Excelente producto

Buena calidad

Put a set of these bearings in my Wheels Manufacturing Bottom Bracket. ABEC 5 ceramic hybrid are the highest rated bearings I can find in this size. I will get another pair so I can always have a clean set ready.

Works well. Quality part

MR2437s are meany to fit in a bicycle bottom bracket. I was skeptical at this price, half the comps and 10% or the big names. They were smooth, they fit nicely in the BB90, and I'll put in an update if I break them, but they work!

I did not know that I would need spacers and a dust cover. The OEM dust cap fits through the OEM bearing and has a lip that pops out the other side of the bearing to keep it in place. The inner diameter of these bearings is smaller than the OEM bearings, so the OEM dust cap doesn't fit - so, I needed a spacer and dust cap. Fortunately, I got a different bearing kit at the same time as this one that came with spacers and covers. I used these Abec-5 with the spacers/covers from the other kit.

These lasted for two rides, then.... Crunch. I anticipated this would happen so fortunately I had a set of Enduro plain old steel bearings. Those usually last for 3-6 months in my Wheels Manufacturing BB30 Shimano 24 mm adapter.

Had no issue installing these in the front hub of my bike. Redneck tip: Put the bag with both bearings in the freezer for 24 hours before installation. The cold will contract the bearing and they drop in to about 75% depth without tools. You can then use a 1-1/16 (or similar) socket and rubber mallet to finish seating them. Just make sure they go in EVENLY and that whatever you are driving them in with contacts the OUTER race of the bearing.

This is the second or third set of bottom bracket bearings I have used in my Ridley X-trail cyclo-cross bike. They replace the spares in my bench because I needed to change bearings just before a club ride at the end of last season. That ride followed a gravel ride where I encountered water with about 0.5km to go at the end of a rail trail section. Rather than add 20km to my day I headed into the water and immediately had to get off and walk: it was too deep and the bottom was mud. I pushed the bike across what turned out to be more like 0.7km. The BB was under water quite a bit during that and just before the next ride I found that one of the bearings was seized. They are easy the swap with Wheels Mfg. puller which I did and it is running fine. So, these bearings feel good and the price is right but they do not like water. I openned my Shimano Deore XT rear hub after that and there was still lub in it, just a bit black. The hubs got a bit less water but still it indicates that Shimano is more robust.

They shipped quick and measured up correct which is good.. But... They clearly show the bearings with Blue seals but did not come with that, they are black. In my experience, and I have a fair bit, your basic inexpensive bearings will come with a bare bones cheap black rubber seal. Seals of higher quality and different rubbery type materials will be other colours, like blue, green, yellow etc. I specifically chose these because they were shown with a blue seal indicating a better quality seal. Now they also state "silicon nitride ceramic balls". To be fair I have not and will not pop them apart to see but I highly doubt that they are ceramic when the seals aren't even the same as pictured. I can purchase a cheap offshore bearing at a local industrial place for about $6-7, so at $10 for these I won't bother sending back and will just use them for as long as they last. Guessing I'll get 3-4 months like I get with my local $6 ones. Too bad about the false claims. Did the review just to make other aware and to not expect much. Still gave 2 stars based on the quick amazon shipping and the fact that they do measure correctly for a 6804...