How to Remove and Install Bottom Brackets - Threaded Shell (BSA, T47, Cartridge, etc.)

This video walks through the complete procedure of removal and installation of bottom brackets used in threaded shells, including three-piece cranks, threaded "thru-spindle" external bearing cups, and bottom brackets used in T47 shells.

Questions or comments? Leave them below!

See all our bottom bracket videos in our Bottom Brackets playlist

Video contents:
00:00 Preliminary Info
01:36 Removal
03:56 Installation - Thread Preparation
05:19 Installation - Threaded Thru-Spindle
06:09 Installation - Cartridge-Style

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➤ Tools & materials used:

➤ More Bottom Bracket Repair Help:

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➤ About Park Tool:
Since our founding in 1963, Park Tool has been the leading name in bicycle tools. Our YouTube channel is an extension of our mission to be the ultimate resource for mechanics and riders of all skill levels. Here you will find comprehensive repair help tutorials for a wide range of components and processes, as well as troubleshooting guides, tips and tricks, and information on the latest Park Tool products.

[dustinmorse]

How many are here just to remember which way to turn a BB.

[p]

We must protect Calvin Jones at all cost.

[timnolan]

Another quality video clearly explaining the process. Calvin is a legend!

[godzillaisnuclea]

This channel is so comprehensive, so clear and its free, i'm amazed that a resource like this exists today

[RussellCambell]

Mission accomplished!!

Bottom bracket replaced ultra annoying noise gone!!

Thank you

[krollpeter]

You should get an Oscar for the best instruction videos on the internet.
The world would be a better place if all companies would so clear + concise about their products and how to use them!

[namdarbolour]

To prevent cross-threading the cartridge, one nice trick is to install the hollow cup (left side) first hand-tight. Then install the cartridge from the right side, so it will automatically center when it goes through the hollow cup on far side of BB, thus preventing cross-threading. Then back out the hollow cup, tighten the cartridge, then the hollow cup. This tip from Sam Tracy's "Bicycle: A Repair and Maintenance Manifesto, 2nd Ed, page 159.

[centraterasen]

Calvin, you are the man and the instructions that you provide on this any many other topics are pure gold. There are a lot of hacks out there but you are the true diamond. Thank you for sharing of your experience with the masses.

[disparage]

This video makes me want to personally thank the people who made it. Not many videos do that.

[tenpennyguy]

This video really helped me with replacement of two old square taper spindles by cartridges. The comments on care to avoid crossthread, use of threadlocker & grease, & torque were especially valuable. One lesson learned - The BB shell of older and cheaper bikes may be out of round, complicating the process of installing the cartridge.

[stateofdecay]

4 years later and the video is still one of the best

[ClaudiuB]

Wow, thanks about the turning directions. I was struggling to turn counterclockwise on chain side in order to disassemble it and before making any mistake I said: let’s check youtube

[Ballmead]

Love your videos mate. You're clear, concise and easy to follow. You've helped me out many times with my bikes.

[codyhughes]

Thanks guys for all the help. I've decided I needed something to stay busy bought an gt avalanche needed some love with the help of you guys and Bermpeak I've been able to learn something different buy kinda the same. Cheers.

[ub]

I love how they don’t only use high end bikes, it shows how humble they are.

[jubeirok]

Thx for all the tutorials - I replaced a creaking bb with a new one. ❤😊🎉

[Pushyhog]

Mr. C is the best & lights, action, camera, edit, edit timing, filmography videos.

[reynoldeuler]

High Quality Video. Many thanks for the good work. This is why I always try to buy ParkTool products.

[Sparvar]

You are amazing, thank you so much for your help! The first one I have found that makes sense and is easy to understand. And 10/10 on the moustache!

[knowledgeispower]

Thank you very much for this concise, yet thoroughly informative video! I was able to tune up all the bikes at my house with basic tools. You’ve saved me a bunch of money and the bikes are better than ever!