New high-speed ball-bearings produced especially for XRAY. ID x OD x depth (mm) = 5x12x4. Pair of 2 pieces.
Top-quality expert ball-bearings for a super-free, super-smooth drivetrain. These highest quality ball-bearings are fitted with original synthetic covers, and are usually degreased and gently oiled with AeroShell Fluid 12 oil for maximum smoothness, longevity, greatest limit and maximum performance.
These ball-bearings have significantly more (and larger) balls inside cage versus regular ball-bearings, making them more resilient under lots. The inside covers are really an easy task to expel for simple and fast maintentance.