Park Tool BBT-179 Bottom Bracket Tool

Made from precision-machined 4140 steel, the BBT-179 is a high-performance tool for removing and installing select threaded bottom brackets with a 12-notch tool holder, including SRAM® BSA DUB®, Race Face® Cinch®, Rotor® BSA30, and others. The BBT-179 is designed to be compatible with any bottom bracket featuring the corresponding tool holder. It features an extra-deep body for particularly wide axles and flat walls at the engagement point for recessed lockrings. The BBT-179 offers three tool engagement options—a 3/8" drive, a 1" hex, and 36-mm wrench flats—so you can loosen even the most stubborn bottom bracket shells. For added stability, the BBT-179 features integrated threads for use with the Park Tool BBT-RS Bottom Bracket Tool Retention System or the GPS-1 guide pins (each sold separately).

Features of the Park Tool BBT-179 Bottom Bracket Tool

Compatible with 12-notch threaded connections on bottom brackets with a major diameter (outside the notches) of 45–47 mm and a minor diameter (inside the notches) of 44 mm, including:

• SRAM® BSA DUB®
• Race Face® Cinch®
• Rotor® BSA30
• Zipp® Vuma™
• Hawk Racing™ BB3086™

Tool Specifications:

• 3/8" drive
• 1" and 36-mm wrench flats
• 50.04 mm (1.97") outer diameter at the engagement point
• Internal clearance: 42 mm (1.654") depth (from front of tool) x 30.44 mm (1.198") diameter
• Not suitable for use with impact wrenches