2-1/8" Spider Diameter

This category groups Extreme HD Parts machined to an oversized 2-1/8″ spider diameter, the bore that seats the s-cam inside the enclosure tube. You’ll find enclosed cam tube-only assemblies, complete tube kits, and s-cam bushing kits matched to this bore, in both left-hand and right-hand rotation. It’s aimed at shops spec’ing brakes around the larger 2-1/8″ bore.