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Do they need to be replaced? Why can't you service them?
When I did the conversion, I just put a light bit of fresh grease on the new driver, everything came apart looking good so I didn't touch the sprags. It's been a while but as I recall the only tricky part was setting the preload, I think it needed to be done under full installed axle clamping load.Bumping this thread as I would like to convert a classic hub to micro spline.
As I understand it, there is no need to regrease the sprag clutch? Bearings appear to still be in good condition.
What kind of grease did you use on the driver?When I did the conversion, I just put a light bit of fresh grease on the new driver, everything came apart looking good so I didn't touch the sprags. It's been a while but as I recall the only tricky part was setting the preload, I think it needed to be done under full installed axle clamping load.
I should have specified, I used the Kluber Isoflex LDS 18 Special A grease as required by Onyx. I believe they include some with the kit, but I bought a tube of it years ago when I got my first pair of Onyx hubs. It's pricy but that tube will probably last me forever. The sprags need a pure grease with no added friction modifiers to function correctly.What kind of grease did you use on the driver?
I have a classic that's been in use since 2016 and I've never needed to service the sprags. My hub still spins super smooth. It's pretty amazing how long the sprag bearings can go without needing anything.Bumping this thread as I would like to convert a classic hub to micro spline.
As I understand it, there is no need to regrease the sprag clutch? Bearings appear to still be in good condition.
Just come across this post.When I emailed Onyx to find out:
Hi Tim,
That hub has the following bearings
6902
6805
6804 – center bearing, replaceable here at Onyx only.
On the non-drive side there are two different variations. The 6804 version has be serviced here – that’s the red hub in the attached picture. The 6902 version is field replaceable – that’s the Antifreeze Green hub in the attached picture.
Thank you,
Dan Peterson
Sent from my moto g(7) power using Tapatalk
Can you get the inner bearing out with a slide hammer? What size drifts do you need to press in the various bearings?Just come across this post.
I don't know why Onyx say only they or a machine shop can replace the centre bearings, i've done several myself no problem. I have a park tool bearing spacer / bushing set and some other bits and pieces to use as spacers etc. It is not as simple as a conventional hub with 1 bearing either side that I agree, the only issue is that the NDS bearing and the centre bearing are the same size, so once the outer bearing and its locating circlip are removed, you remove the inner bearings circlip and use the puller to pull the bearing out and with a rejig of spacers etc to then pull it out through the outer bearings bore and a reverse to pull the new inner bearing through the outer bearing bore then pull into its central location. Its a bit of messing about to set it up right but perfectly doable.
This does sound a little complicated. It would be nice if there was a service video.Just come across this post.
I don't know why Onyx say only they or a machine shop can replace the centre bearings, i've done several myself no problem. I have a park tool bearing spacer / bushing set and some other bits and pieces to use as spacers etc. It is not as simple as a conventional hub with 1 bearing either side that I agree, the only issue is that the NDS bearing and the centre bearing are the same size, so once the outer bearing and its locating circlip are removed, you remove the inner bearings circlip and use the puller to pull the bearing out and with a rejig of spacers etc to then pull it out through the outer bearings bore and a reverse to pull the new inner bearing through the outer bearing bore then pull into its central location. Its a bit of messing about to set it up right but perfectly doable.
Pretty rare to never. It's the most well protected and lightest loaded bearing in the hub. I've had a couple of sets for years and I have never had to touch the center bearings. But I would definitely figure out how to replace it myself before sending it away if I ever have one go bad.How often do the center bearing need to be serviced?
2x6804, 1x6805, 1x6802 for ISO 6-bolt hub. In addition to that, the driver requires its own bearings that are model-specific. The older axle design might use different driver bearings than the new, and currently used MFU axle design.and it looks like the rear hub may require 4, 5, or 6 bearings. The video on that page shows 4 bearings. Does anyone know how many bearings are in the rear hub, and how many of each I need? Thanks.
Maintenance on the hub can vary depending on usage.
At this time frame (2/2023 with no service ever), we would suggest cleaning and regreasing the clutch mechanism. This uses a specific grease and should be done every few years as it will absorb condensation.
On the classic hubs from ~2018. The brake side bearing is a 6804. The drive side bearing is a 6902. These are the two most common bearings to wear out.
The clutch area has a support bearing on each side. 6804 and 6805 size.
All the stock bearings in the hub are ceramic hybrids. They can typically be cleaned and greased rather than replacement. We have video walk throughs on our youtube channel for reference on the process.
So, if you want to have replacements on hand for all the bearings in an Onyx Classic 6-bolt Boost hub with a Shimano freehub, and the hub was made before the current MFU design, you need the following bearings:On the classic pre MFU, the shimano freehub has a single 6902.
On the current classic with MFU, the shimano freehub uses a 6802 and 6902 stacked over a spacer.
2x 6804
1x 6805
2x 6902
And on the edge of the inner race facing outwards it says:Verinent
6805 RH
On the inside face of the bearing, there is a black seal, which says:Onyx Racing Ceramic Balls
I removed the orange seal with a pick to service the ball bearings, but the grease was wet, clean, and plentiful; so I put the seal back on without doing anything.Verinent
6805 RS
The bearing in the middle of the hub has a snap ring holding it in place, which you access from the NDS. On the black bearing seal, it says:Verinent
6804 RH
The black seal faces the DS, and there is an orange seal that faces the NDS. If you were to remove the snap ring, I don't see any reason way you couldn't pull that bearing out the DS.Verinent
6804 RS
I stuck my finger through the middle of each bearing, and they all felt smooth when I rotated my finger.Verinent
6902 RH