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PostPosted: Tue Feb 15, 2011 1:15 am 
Dirt Disciple

Joined: Mon Feb 14, 2011 2:45 am
Posts: 19
Hi there, I have an alloy stem stuck in a steel threaded for steerer.....any advice getting the two to part?.....the centre pin and wedge thing are loose and free, but they seem locked together.....on two frames I own! :?


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PostPosted: Tue Feb 15, 2011 9:06 am 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
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Joined: Sat Jan 27, 2007 10:35 pm
Posts: 8423
Location: The desolate flats of Cambridgeshire
Give me a lever long enough and I can shift the world. But some Penetrating oil or coke would probably help in this case.


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PostPosted: Wed Feb 16, 2011 8:13 pm 
Old School Hero

Joined: Fri May 08, 2009 5:17 pm
Posts: 226
Location: Edinburgh
Ammonia can dissolve aluminium corrosion, try blocking the stem bolt, turning the bike upside down and filling the steerer with ammonia. Go easy on the twisting, it's really easy to bend/twist light rorks. Use a bit of wood between the top of the fork legs rather than the wheel to twist against. This reduces the risk of twisting the forks blades.

Failing that, a nuclear option that has worked for me in the past is; saw off the top of the stem leaving 4cm of stem poking out. remove forks from frame. blowtorch steerer, aiming to get it to the point just before it turns red. dunk the stem-stump in ice water to just before the steerer. the stem then cools more than the steerer, when the water stops boiling off the stem put the stump in a vice, should twist/pull right out.

This should only really be done if you absolutely have to, it's a pain in the arse and dangerous! You could also use caustic soda to dissolve the aluminium but that's even more dangerous/annoying


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PostPosted: Thu Feb 17, 2011 10:44 am 
Retro Guru

Joined: Wed Dec 10, 2008 9:19 am
Posts: 2098
Location: Sheffield, top city
hey Eastsidebikes, are you Dr Frankenstein by any chance? :lol:


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PostPosted: Thu Feb 17, 2011 11:20 am 
Old School Hero

Joined: Fri May 08, 2009 5:17 pm
Posts: 226
Location: Edinburgh
I have put together some zombie bikes in my time :D


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