We want to encourage those of you who ENJOY our site and find it USEFUL to DONATE and UPGRADE your membership from active member to donating or premium membership. If you want to know the differences in membership benefits, please visit THIS PAGE:
The ones with black center is for Sram (X7) shifters. These use Sram bearings and that black spacers from broken original Sram wheels.
The one with chrome center is for Shimano (SLX) shifter. These use Shimano hardware from a worn out wheel.
What motivated me is it. Sram wheels broke before being wear out. And they are expensive!