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A customer brought in a bike with a seized seatpost that had been stuck for over a year.
I tried the usual ammonia mix first, but it didn't budge. Then I heated the seat tube with a heat gun for about three minutes, focusing on the area just below the top tube junction. The aluminum post finally twisted out with a loud crack, and the inside of the steel tube was covered in white corrosion powder. What's your go-to method for a post that's been frozen that long?
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lilyf747mo ago
My old shop teacher swore by a 50/50 mix of acetone and automatic transmission fluid. He said it creeps into the corrosion better than anything. I've seen it work on a post that was in there for a decade. That white powder is the worst sign.
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claire9925mo ago
Mike tried that acetone trick on a seized fence post last year and it actually worked, and @paige_wells44 was there to see it.
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