Park Tool BBT-22 Shimano Bottom Bracket Cartridge Tool
Park BBT-22 Shimano Bottom Bracket Cartridge Tool is a shop quality tool for installing and removing Shimano and ISIS Drive splined 20-tooth bottom bracket cups. Made from investment cast steel, the BBT-22 utilizes a flat tooth profile to ensure maximum engagement with the bottom bracket cup. Can be used with a 3/8" drive torque wrench, 3/8" ratchet driver, 32mm wrench, FRW-1 Freewheel Remover Wrench, or 1" wrench.
I hate internal cartridge bottom brackets. I especially hate the shallow splined interface someone opted for on one of the most abused, cold-welded, and torqued-upon parts of the bike. That being said, this tool is a versatile way to handle a less-than-ideal situation. The ability to switch between a variety of wrenches practically guarantees that you'll have something handy that'll turn this tool when the time comes. It is also very durable. I have seen lesser sockets strip at the splines and get mushy edges on the hexes. This won't.
Its a pretty straight-forward tool, but when you need it there really is no substitute. Park Tools make the best bike tools out there.
I've had mine for 15 years or so. It's been used extensively and the finish barely shows any use at all. Sits in the box and doesn't take up too much room. Nice too, great price.
Great little tool, has removed many a bottom bracket. Held up to impact use on one stuck BB - lost some paint on the splines but doesn't seem to affect use. Good lifelong tool.