The XSO chains features RK's proprietary "RX-Ring" seal design and is offered in 520

The base is shot peened and anodized

while incorporating the SUB mounted stabilizer to slip in under the bars

This allows for higher mileage in the center and increased grip on the edges for stability in cornering

Please note uses OEM stem nut

Motorex - DOT 4 Racing Brake Fluid Supplier-Zoom Cleaner The XSO chains features RK'sDeveloped especially for use in extremely harsh conditions encountered under the highest level of motorsports racing. Helps prevent vapor lock in the harshest environments. Specifications Extremely high dry and wet boiling points (min. 295 C 195, C 563 F 383 F) Made for use under extreme racing conditions Can be mixed with all brake fluids of the same specification Far exceeds DOT 4 and higher specifications. FMVSS 116 DOT 4 ISO 4925 CLASS 4 SAE J1703