Sram Black Box Ceramic Bearing Jockey Wheels XX1 & X0 11T Teeth_36T Max PSI: 40

Max PSI: 40

Axle to crown: 520mm

The Nike Air Zoom Structure 22 Running Shoes look fast and feel secure

with the adjustability

classic-style

Sram Black Box Ceramic Bearing Jockey Wheels XX1 & X0 11T Teeth_36T Max PSI: 40Sram Black Box Ceramic Bearing Jockey Wheels XX1 & X0 11T The SRAM Black Box ceramic derailleur pulleys are made of the same material as the standard pulleys, but they use polished stainless steel races and ceramic ball bearings in a sealed unit. The pulleys are a bit lighter and more durable thanks to the ceramic balls, but more importantly they have substantially less drag than standard stainless steel balls. And they can be taken out and re lubed