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Stuck for a full day on a seized bottom bracket in a steel frame
Had a 90s steel road bike come in with a square taper bottom bracket that would not budge, even with my longest breaker bar and a ton of penetrating oil. I ended up building a jig to hold the frame and using a 4-foot pipe on the tool, which finally broke it free after about 8 hours of trying different things. What's your go-to method for a bracket that's really stuck in there?
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seanlee6mo ago
Honestly, I've had the best luck with a big pipe on the breaker bar and a solid hit with a mallet to shock it loose before applying steady pressure. The key is making sure the frame can't twist, so I'll clamp the down tube in a bench vise with soft jaws. If that fails, heat is the next step, but you gotta be real careful with a steel frame to not wreck the paint. Sometimes it just takes a mix of patience, more penetrating oil, and a lot of force.
7
anna_ross196mo ago
Been there... my last resort is always heat. I get a propane torch and carefully heat the shell of the bottom bracket, not the tool, until it's really hot to the touch. The metal expands and breaks the rust bond. Then I hit it with my longest breaker bar while it's still hot. It usually pops right out, but you have to be careful not to damage the paint.
1
lane.cameron6mo ago
That "last resort" heat trick is a lifesaver. I've had a few bottom brackets that just would not budge until I broke out the torch. It feels so good when it finally lets go.
1