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Count Splines/Notches
Remove the crank and inspect the bottom bracket shell for tool fittings, which can be notches or indentations on the outer perimeter, splines on the inside perimeter, or pin holes on the face. Count the number of tool fittings on the cup.
Measure Diameter
Next use a caliper to measure the diameter or width of the tool fittings. For external notches, simply measure the outer diameter of the bottom bracket cup or adapter. Take the measurement in millimeters.
Select Tool
The BBT-69.3 is for 16-notch tool fittings with a major diameter (outside of notches) of 44-45 mm and a minor diameter (inside of notches) of 42.7 mm. Here are some tools we offer for this and a few similar tool fittings:
TRUSTED SINCE 1963
Since our origins in the back of a bike shop in 1963, it has been Park Tool's sole mission to design and manufacture high-quality tools that empower mechanics and riders of all skill levels to service their bicycles. Just like our other 500+ tools, our bottom bracket tools are a product of our decades of experience and expertise in the industry, in the shop and on the trail.
John
August 9, 2025
Used to mount/dismount centerlock rotors without any issues. No slippage, very sturdy and effective. Have not used it for bottom bracket yet.
Brian
July 23, 2025
I have not used this on a bottom bracket, but I used it to remove and install Shimano center lock brake rotors on a new set of carbon wheels and it worked flawlessly. I'd never performed this task prior to using this tool, but had no problems at all. Precise and snug fit between the tool and the notches in the rotor lock ring. My only question is why it's also described as a pedal tool. Not sure how it would be used to remove/install pedals.
rq8
May 30, 2025
Used to remove/replace a bad bearing and install new shimano replacement. No issues, easy to use.
Will
May 28, 2025
Well made, and I can use it with my torque wrench.
Old crank
May 16, 2025
Splines securely engage the notches on the threaded BSA bottom bracket. I allows removal and installation without marring the BB. Different threaded BSA bottom brackets have different diameters and number of notches, so be sure to get the correct tool for the job. I needed two different ones, one to remove the old BB and one to install the new one.
S Mauro
May 10, 2025
Metal was too soft to remove very stuck center lock disc brake retainer nut. Since the metal was soft aluminum, and the grip surface was very thin, this tool did not work great. I needed to use a ton of penetrating oil and an overnight soak. Only then I was able to remove the lock nut, still with a lot of force. However, the soft metal tool was damaged in the process. A harder metal, like steel, would be a better choice for this too. Also, a better was to hold grip onto the thin lock nut. PS: Whomever put the nut on before, obviously put it on too tight. I have now put on a replacement (original was damaged during removal), torqued to the proper spec with a torque wrench. This tool was very useful in using my torque wrench.
M. Parr
May 8, 2025
I like good tools, I love good tools made in the USA.Park tools are expensive, but they are precision made, fit right and are easy to use. Park engineers are pretty sharp in my book.
NShmeat
May 7, 2025
Came in a tiny package that just fit the item here. used it three time now and haven't seen any problems. feels nice and did the job well. would suggest.
Fabrizio Bandiera
March 11, 2025
Parktool è una garanzia.Perfetto per la ghiera certerlock esterna e per movimento centrale Ceramispeed BSA Shimano
Steven Reeves
February 24, 2025
Used it to replace my GPX bottom bracket. I love aluminum tools and this one is no exception.
Team4L
February 23, 2025
Pratique pour le démontage des boîtier BB et des écrous center lock
Sebastian Schaffranek
February 16, 2025
Sehr passgenau und präzise verarbeitet.
JohnnyB
December 14, 2024
Used to replace bottom bracket on mountain bike with ease. Park tools are well made and reliable. My son works in a large bike sales/service/repairs wharehouse and they only use Park Tool products. Says it all really. Pay more, get more.
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