About Us

I started Performance Line Bearings because my Bosch powered ebike is now out of warranty. Sadly, the motor became noisy and I discovered play in the crank arms, coming from the motor crankshaft itself.

After reading the forums I decided to replace the main motor bearing, but after removing the right-hand motor cover, I found not only the main motor bearing was worn but also the left-hand crankshaft bearing.

After weeks of hunting on the web, I could find no information or parts for this issue! Not being keen to spend big money on a new motor I found a reputable bearing manufacturer and had the left-hand crank-shaft bearing manufactured.

I have also had enough bearings made for others who may find themselves with the same issue. Although the left-hand crank bearing carries the standard designation 6004 but it’s not a standard internal bore diameter and therefore, not an “off the shelf” part.

After starting with the Bosch motor I was asked if I could do other motors? And After looking at other motors, it was evident they suffer from the same issues (water ingress destroying the bearings). Again, some of the parts had to be made and some were very hard to find, but so far, we now offer this service for Yamaha, Brose, Panasonic, Impulse etc.

We started life working from a log cabin, but now we have a commercial unit with a custom built workshop, just for ebike motors. I believe the motor is the heart of the bike, so built an operating theater to take special care of it.

The how to video and downloads are my own guides, and for information purposes only. I will not be responsible if you follow them and break something! You will be doing so at your own risk.

Thank you for stopping by. I hope it helps if you find yourself out of warranty and suffering motor failure.


If you would like to see more?