

Hiya Team!
I’ve made a bit of a cockup whilst trying to install some new bits to my bike.. basically the bottom bracket cups wouldn’t come off and we tried everything we could think of (including the angle grinder, the first mistake) and was wondering if anyone on here would know what to do? Really love this frame so would love to fix this mess!
Please help!
by AlfiesLeftleg
29 Comments
How long of a lever have you put across those cross slits?
That frame is in the process of becoming a piece of wall art my man. You know about the non standard threads of a bsa bottom bracket shell?
Just stop whatever you’re doing to the frame you love so much and take it to a professional. There is a very slim chance there are enough notches left on that shell to put a tool on. Heat/cold, good penetrating oil might help too. It’s it quite possibly galvanically frozen into the bb shell if that’s a steel frame.
Autoshop/machine shop or maybe a lbs could help. Anyplace with some good tools…
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Just curious:
Did you first try with a proper BB tool?
Did you try a pipe wrench after?
There are ways to save it, but if you actually want to at this point, you need to take it to a professional and be prepared to pay for it. It’s going to be very time consuming and stressful and you should tip your mechanic afterwards if they succeed.
Take it to a reputable bike shop. All is not lost, you just need aomeone who knows what they are doing. If you’re in Toronto by some strange coincidence I’d be happy to help you.
What I do in my workshop in a situation like this: I feed a hacksaw through the bottom bracket and saw through the cups in 3 different locations. If you keep the saw level, then the cups will come out with ease, and you’ll cause minimum damage to the threading, and you’ll still be able to install a new bottom bracket once the threading has been re-cut.
Now the cups look like they’re aluminium, so it’ll be easy to saw through. This trick doesn’t work on hardened steel.
Edit: corrected spelling errors from auto correct
I’d soak the bb in penetrating oil, clamp those cups in a bench vise and twist the frame.
Were you turning it the right way? 😉🤣🤣
You went to the angle grinder before grabbing a pipe wrench? You need to be able to install the new BB as well, so you may as well get the right tools now.
Thats a mess.
do you live in a cave?
Can’t help with the bb but it’s pretty cool you get to work in the bat cave
What in tarnation!!
You really need to stop and take this to a bit shop
There reverse thread, so using the correct tool abs rotating forward to loosen will make a huge difference!
Best of luck getting them out now.
Learn how to use a pipe wrench + torch
BB question adequately answered; i want to know more about the bike cave.
1. Google how to turn a BSA bottom bracket
2. I would grab what is left of the BB cup with pliers and tap the pliers with a hammer.
Time to go to the store and buy 3 six packs of beers. Bring those and the bike to your local bike shop and beg, ya done fucked up dog
A hacksaw blade and a zen 6hrs may be in your future
Lol, did “everything you could think of” include using a bottom bracket tool (like a Park Tool BBT-9) + some penetrating oil?
Looks like you got the angle grinder into the frame, I’m no expert but that looks cooked (long term it’s going to fracture because you’ve created a stress point)
Should have stopped to think a little harder the moment an angle grinder came into mind.
Brute force is rarely the solution. Sometimes it is, but usually you’re doing something very wrong.
Angle grinder 🤣
Did at no point the thought that you don’t ever need to use an angle grinder in bicycle maintenance ever occur to you beforehand?
Big pipe wrench
Honestly think it’s over. It looks like you already went through part of the frame with the grinder. But only the shop that gets that out will be able to assess that.
Did you use the correct tool…?
You just need to keep trying new and novel persuasion devices. Just go wander the isles of Harbor Freight and think of all the possibilities and combo of tools you can destroy. Godspeed 🫡