External English (BSA) threaded bottom bracket for 73mm shells. Wheels Mfg uses only Enduro bearings and silicone seals for the most durable and smoothest bottom brackets available. Fully serviceable. Includes: (2) – Enduro Silicone dust seals (1) – 2.5mm aluminum BB cup spacers for use with 68mm wide BB shell (1) – 1.8mm aluminum BB cup spacers for use with 68mm wide BB shell (1) – 0.7mm aluminum BB cup spacers for use with 68mm wide BB shell (2) – 0.5mm crank spindle spacers (2) – 1.0mm crank spindle spacers (1) – Wave Washer Direct replacement for SRAM/Truvativ GXP bottom brackets! – Bearings: Enduro ABEC-3 – Color: Red – Bottom Bracket/Frame Interface: ISO/English or BSA Threaded (1.37 in x 24 TPI) – Bottom Bracket Shell Width (mm): 68-73mm – Bottom Bracket Shell I.D.: 33.6-33.9 mm – Crank Spindle Type: GXP (SRAM, Truvativ, Etc.) – Crank Spindle Diameter: 22/24mm – Weight: 116g