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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-79.3 is for 12-notch tool fittings with a major diameter of 45–47 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.
Steezy C
August 2, 2025
Great quality tools from Park Tools as always. Yes, there are cheaper options but if you want to get the job done correctly then buy once, cry once. The BB tool fits the SRAM BB perfectly and grips the bb giving you confidence that you won’t damage anything. Solid performance!
ErikH
July 3, 2025
As others have mentioned a bit expensive for what it is but it works very well.
Daniel Williams
June 14, 2025
This tool is durable and made of high quality materials. Use is intuitive and the price is great!
Richard Daugirda
May 16, 2025
Disappointed it wasn’t blue in color, but silver is OK too.Bought to fit a SRAM DUB BB. Works well, no issues as I would have expected.
Jake Goss
May 9, 2025
Parktool makes the best bike tools and this one lives up to that. The trick is finding exactly the one you need. I like this socket wrench version of the tool as well for torque control.
Priscilla
March 14, 2025
The price is a bit high, but unfortunately, I needed to remove my SRAM bottom bracket, so I had to pay for it. I was concerned about buying a non-Park Tool version due to the inconsistent reviews I saw. You just can’t go wrong with Park Tool!
Kevin
February 22, 2025
Incredibly easy to work on bikes when you have the right, high-quality, tools made by a reputable company. Thanks Park Tool!
Stephen Howard
February 18, 2025
Worked on my dub bottom bracket
Robert
February 8, 2025
Wie immer eine tadellose Qualität von Parktool. Lösen und wieder festziehen des Lagers ging problemlos.
Nuno Luz
January 29, 2025
Don't get any of the other rubbish tools here on Amazon they're just awful.Parktool tools just work and they're expensive but will save you a lot of money
Friedrich Krause
January 25, 2025
Passendes Teil
Sean
January 23, 2025
Again this need a redesign as it slips off and you injure yourself hahaha not funny it hurt
Bergelch
November 22, 2024
Sauber gearbeitetes Werkzeug mit Gewinde für das Anbringen einer "Abrutschhilfe" - BBT-RS Haltesystem.
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