Park Tool BBT-118

Shimano Octalink drive-side bottom bracket cups with external notches ISIS Drive bottom bracket cups including Truvativ and Bontrager Front chainring lockring for Bosch Gen 3, Gen 4, and Gen 5 e-bike systems Front chainring lockring for Specialized Levo Brose e-bike systems 8 notches with a nominal inside diameter of 37.6 mm and outside diameter of 42.7 mm Internal clearance: 31.14 mm (1.226'') depth (from tool face) x 22.48 mm (0.885'') diameter Attributes Bottom Bracket Type 42.7mm/8 notch