The job
A cartridge-cup socket with a 32 mm contact, 3/8-inch square drive and one-inch external flats.
Park Tool · Bottom-bracket cup tool
Park Tool BBT-22 Cartridge Bottom Bracket Tool
A cartridge-cup socket with a 32 mm contact, 3/8-inch square drive and one-inch external flats.
$41.28Nov 7, 26, 12:53 AM · New York
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- Component contact 20 splines; 32 mm
- Square drive 3/8 in
- External flats 1 in, not 32 mm
Component contact
20 splines; 32 mm
Distinguish contact from wrench size
Buy the driving wrench for the one-inch flats or 3/8-inch drive; do not use the 32 mm contact dimension as the wrench specification.
What this choice changes
Twenty-spline engagement for matching cartridge cups
The BBT-22 addresses the 20-spline cartridge bottom-bracket fitting, a different contact from the 16-notch tools used around external cups. Its hollow form clears the oversized ISIS Drive and Octalink spindles named by Park Tool. That clearance is useful during cup service, but does not turn the socket into a crank puller.
Keep the two kinds of size separate when planning your tools. The 32 mm dimension describes the component contact; the socket is driven through a 3/8-inch square drive or one-inch external flats. A suitable driving tool is separate. The flat tooth profile and spline engagement are the features to compare against the cartridge cup, rather than choosing from a brand name alone.
Choose it after confirming both the 20-spline pattern and the cup’s dimensions. If your service begins with removing a supported crank arm, a suitable extractor such as the correctly configured CWP-7 performs that earlier operation. The BBT-22 then handles the matching cartridge cup.
Specifications & supplied details
| Detail | Specification |
|---|---|
| Component contact | 20 splines; 32 mm |
| Square drive | 3/8 in |
| External flats | 1 in, not 32 mm |
| Spindle clearance | Maker names oversized ISIS Drive and Octalink spindles |
| Body | Tool steel with flat tooth profile |
| Supplied | One socket; driving tool separate |
Choose for your actual setup
Distinguish contact from wrench size
Buy the driving wrench for the one-inch flats or 3/8-inch drive; do not use the 32 mm contact dimension as the wrench specification.
Identify the cartridge cup
Spline count and fitting diameter must both match. External-cup tools are not substitutes simply because the bicycle brand is the same.
Fit checks & limits
- Not a crank-arm extractor.
- No impact-driver or other power-tool use.
Questions before you choose
Why are 32 mm and one inch both listed?
They refer to different interfaces: 32 mm is the cartridge contact; one inch is the external driving flats. The square drive is 3/8 inch.
Does Octalink compatibility mean this pulls an Octalink crank?
No. It clears the named spindle during cartridge-cup work. A compatible crank puller handles crank-arm extraction.
What does the BBT-RS add?
In supported configurations it helps retain the tool against the fitting during initial loosening or final tightening. It supplies neither this socket nor its driving wrench.
Guides for this choice
Buying guide ↗
Match the Component Contact Before the Drive Handle
Separate the surface that touches the bicycle from the interface that accepts your wrench, then check access and any required retaining accessory.
Buying guide ↗Choose Crank Pullers, Cap Tools and Bottom-Bracket Contacts
Separate arm extraction, cap adjustment, cup engagement and counterholding to buy the contacts your actual drivetrain needs.
Other equipment to consider
Selected listing details, manufacturer information and source images were compared. No hands-on trial or universal fit is claimed. Product identifier: B0014BM9Q2.