Anyone sourced an upgrade for these(Fafnir 203VV)? I believe the originals are only rated for something like 12000 RPM, but are spinning over 17000 RPM. I think their longevity is limited due to the fact that the grease spins out of them. I recall finding some higher RPM rated bearings in the past, but never found a source for them.

 

These look like they will work(6203ZZ): 2 Bearing 6203ZZ 17x40x12 Shielded Ball Bearings

 

Will see how they hold out:

 

Any 6203 bearing will work(any local parts store should have plenty). The letters behind the 6203 just tell you what seals the side has, if any. For the price of them I would just run what you have until they start making noise.

6203-2RS Bearing 6203 Radial Si3N4 Ceramic Stainless ABEC-7

http://www.6203bearing.com/6203ZZ-Be...ess-ABEC-7.htm

http://www.bearings-china.com/sitema...c-bearings.htm

 

Looks like the ceramics are even higher speed rated.

 

The last set I bought from ProCharger were noisy from the get go. They told me that is not possible and to send them back. Never did and they only lasted less than 2k miles.

I normally buy either Japanese or German bearings and switch out when needed. Have almost 60k on the system and have replaced the idler bearings probably four times.

As I write this, it doesn't sound very reliable. WTF