Bottom Bracket Tool Selection: Press Fit
This article will review the selection of Park Tool options for various press fit bottom bracket systems. For service procedures see Press Fit Bottom Bracket Removal and Installation. For a review of the various bottom bracket standards, see Bottom Bracket Standards and Terminology.
- Digital caliper, such as Park Tool DC-1
The “press fit” bottom bracket lacks threading both in the frame and on the bearing adapters or cups. The bearing or bearing cup will be slightly larger than the bore of the frame and is pressed inside the shell. This creates an interference fit, also known as a press fit (PF). The bottom bracket is then held in place from the pressure created by the interference. A press fit bottom bracket will have no tool fittings.
If the cup or bearing adapters has tool fittings, it is either a threaded bottom bracket or thread-together bottom bracket. In either case, see Bottom Bracket Tool Selection: Threaded and Thread-Thru.
Press fit bottom brackets vary both in the shell diameter fit and the diameter of the crank spindle they will accept. Tool choice is determined by the inside diameter of the bearing, which nominally matches the outside diameter of the compatible spindle. Measure either the inside diameter of the bearing or the outside diameter of the spindle.
It is also possible the bottom bracket cups use an adapter to reduce the inside diameter for a different diameter spindle. These adapters must be removed first, using the correct tool for the inside diameter of the adapter.
24 mm & 22/24 mm Stepped Spindles
Examples include Shimano® two-piece cranks, SRAM® GXP®, and many more brands and models which feature 24 mm spindles. This includes the stepped spindles such as the SRAM® GXP® in 22/24.
Use the Park Tool BBT-90.3 for removal.
25–28.99 mm Spindle Systems
Examples include Campagnolo® Power Torque™, Ultra-Torque®, SRAM® DUB®, and bottom brackets with inside diameter from 25 to 30 mm.
Use the Park Tool RT-1 for removal.
30 mm Spindle Systems
Examples include SRAM® PF46 (PF30), PF42 (BB30), Race Face® Cinch® bottom brackets, and other systems using 30 mm spindles.
Use the Park Tool BBT-30.4 for removal
Note: Some special cases require Park Tool RT-1
There are other standards using a press fit system. The “Ashtabula” one-piece crank and BMX standards in Mid and Spanish press into the compatible frame shells. Use a punch and a hammer to remove these bearings.