S
Steve Sr .
Guest
In all of the bearings that I have repacked over my many years of cycling I have never seen this. I
posted a previous question about bearing "roar" when the wheel was spun up on the work stand. A few
folks mentioned that this was probably the freehub and not to worry.
I finally got a chance to pull everything apart today. Both sides had plenty of grease on the wheel
bearings. The non-drive side actually looked pretty clean.
Once I started to clean up all the parts I noticed that both bearing cones looked like they had
galled in rather big chunks. The races in the hub and the freehub looked fine. The ball bearings
also looked fine.
This hub is only about 2 years old and has been ridden about 5-6K miles in good weather. When I
first got these wheels some folks in this group suggested re-greasing them as Shimano didn't use
enough grease at the factory. Taking that advice I tore the hubs apart and regreased them using a
good quality synthetic grease.
Can anyone explain why this bearing failure happened and what to do to prevent it from recurring? Is
this a known problem with these hubs? It almost seems that the bearing cones were too brittle and
rather than wear they just fractured.
As far as repair should I also replace the balls as well as the cones?
Thanks,
Steve
posted a previous question about bearing "roar" when the wheel was spun up on the work stand. A few
folks mentioned that this was probably the freehub and not to worry.
I finally got a chance to pull everything apart today. Both sides had plenty of grease on the wheel
bearings. The non-drive side actually looked pretty clean.
Once I started to clean up all the parts I noticed that both bearing cones looked like they had
galled in rather big chunks. The races in the hub and the freehub looked fine. The ball bearings
also looked fine.
This hub is only about 2 years old and has been ridden about 5-6K miles in good weather. When I
first got these wheels some folks in this group suggested re-greasing them as Shimano didn't use
enough grease at the factory. Taking that advice I tore the hubs apart and regreased them using a
good quality synthetic grease.
Can anyone explain why this bearing failure happened and what to do to prevent it from recurring? Is
this a known problem with these hubs? It almost seems that the bearing cones were too brittle and
rather than wear they just fractured.
As far as repair should I also replace the balls as well as the cones?
Thanks,
Steve