CeramicSpeed

OSPW X Shimano GRX/RX820 2x12 Coated Pulley Wheel System

What Our Gearhead® Experts Are Saying:

"I recommend this OSPW X system to riders who actually put GRX through rough conditions. The coated bearings last noticeably longer, and the ability to change spring tension makes a real difference in chain stability when terrain or load changes."

We rely on drivetrain efficiency to stay consistent when gravel rides turn long and unpredictable. The OSPW X Pulley Wheel System for Shimano GRX RX820 2x12 is engineered specifically for mixed-surface riding, where contamination, vibration, and sustained torque quickly expose weak components. CeramicSpeed designs this system to maintain smooth rotation while protecting bearings from the elements riders encounter beyond paved roads.

The oversized 13-tooth upper and 19-tooth lower aluminum pulley wheels reduce chain articulation, lowering friction compared to stock configurations. Each pulley spins on handbuilt coated ceramic bearings, using Grade 3 silicon nitride balls that increase hardness and smoothness while reducing overall weight. The carbon-reinforced cage balances stiffness with impact resilience, helping maintain precise chain tracking over rough terrain.

Compatibility is tightly focused on Shimano GRX RX820 2x12 drivetrains, ensuring proper chain wrap and clearance up to a 36-tooth cassette. Four adjustable spring tension positions allow riders to fine-tune chain control for fast racing, loaded gravel touring, or muddy cyclocross conditions. This system is best suited for riders chasing efficiency gains without sacrificing durability in demanding off-road environments.