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Struggling with a seized seatpost on a 2019 Trek after trying the ammonia trick for three days straight.
The customer brought it in from a coastal town and the corrosion is so bad I'm thinking about trying a pipe wrench next, but I'm worried about crushing the tube, so has anyone had luck with a specific penetrating oil or a different removal method?
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oscarm246mo ago
Have you tried a mixture of acetone and automatic transmission fluid? That's what finally worked for my old beach cruiser. Apply it, let it sit overnight, then use a long breaker bar on a good quality seatpost clamp for even force.
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sarah_johnson466mo ago
That acetone and ATF mix is a classic. I've had good luck adding a bit of heat too, like a heat gun on the frame tube for a minute before you try to turn it. Just don't get it crazy hot. The real trick is patience, letting that mix work its way down for a full day, maybe even giving it a few more taps with a hammer to help it creep in. A long breaker bar is key, but make sure your bike is really secure so you don't twist the whole frame.
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diana554mo ago
Seat tube, not frame tube, yeah? I'd be careful with that heat too, warped a frame once and learned that lesson the hard way.
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