Bottom Bracket Tools
Combination tool that fits 16 notch external bearing crankset bottom brackets cups and lockrings, and also 8 internal spline crank adjustment caps.
Park Tool BBT-49 16 Notch 39mm Bottom Bracket Tool 3/8" Drive, Black
For installing and removing Shimano and ISIS Drive splined 20T BB cups
Specially designed bottom bracket tool for shop and consumer use.