New high-speed ball-bearings produced specifically for XRAY. ID x OD x thickness (mm) = 13x19x4. Set of 2 pieces. Top-quality professional ball-bearings for a super-free, super-smooth drivetrain. These best quality ball-bearings are fitted with special plastic covers, and they are degreased and gently filled with unique oil for optimum smoothness, endurance, greatest tolerance and optimum performance.
These ball-bearings have more (and bigger) balls within the cage compared to the regular ball-bearings, making them alot more resilient under loads. The medial side covers are easy to remove for quick and comfortable servicing. These ultra-high precision ball bearings are created to withstand all extremes during the track under race conditions if not simply fun race. A "must have" product!
