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Handle bar mounts - 1974 Collegiate Sport

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Handle bar mounts - 1974 Collegiate Sport

Old 10-15-08, 09:48 AM
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jeffsui
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Handle bar mounts - 1974 Collegiate Sport

I have an odd question. My friend gave me a 1974 Collegiate Sport and I wanted to fix it up enough to ride. I overhauled most of the bike and its almost in ride-able status except the handlebars wont "stick".

What I mean is no matter how tight i make the handle bar mount the bars rotate around and around. There was some thin metal that fell out of the handle bars when I took them off (they were already rotating when i got the bike in the first place) but it looks like most of it was missing (which may be why they are rotating in the first place).

I tried to wrap electrical tape - and then tinfoil around the handlebars but I still couldn't make any headway.

Aside from welding the handle bars to the stem - does anybody have any ideas?

Thanks,
-Jeff
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Old 10-15-08, 10:12 AM
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treebound 
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Electrical tape will work as a lubricant and cause it to slip more, I've had to clean a bunch of that stuff out of people's seat tubes when they wrapped their seat posts with it trying to get a seatpost to stop slipping. Clean off all of the adhesive and residue from the handlebar and stem.

Tin foil is too thin and too weak to do much good as well.

The thin piece of metal was probably a shim. It might have been a 2-piece shim at one point, and from the sounds of it one side was lost sometime in the past.

You need to measure the diameter of the hole in the stem and also measure the diameter of the handlebar mounting area. Then either find a shim of an appropriate thickness or find a different handlebar or find a different stem. Sometimes you can make a shim out of a soda can or a soup can if you're handy with tin snips and with bending metal to fit well. But the best way is to find a good match between handlebar and stem sizes.

And sometimes the chome plating on the old steel stems and handlebars has flaked off or been rubbed off over the years. I've got one handlebar at home from an old Schwinn that was clamped into a stem off center and part of the clamping area on the handlebar is distorted thereby making the handlebar rock and become basically impossible to tighten properly.

Don't know if this will help any, hope it does in some way however.
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Old 10-15-08, 10:29 AM
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Thanks... i think it will at least point me in the right direction

-Jeff
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Old 10-15-08, 11:41 AM
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treebound 
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Depending upon what the parts measure out to these might be what you need:
http://www.sheldonbrown.com/harris/h...ars/index.html
Down at the bottom of the page:
Nitto Handlebar Shims $11.95
These beautifully made stainless-steel shims let you use a standard 25.4 mm (1 inch) diameter handlebar in an Italian size (26.0 mm) stem.
Velo-Orange also has some:
http://www.velo-orange.com/haandst.html
http://www.velo-orange.com/nittoshim.html

But again it depends upon the stem and handlebar diameters if these will work. But at least the pic on the velo-orange page will give you an idea of what to fabricate if you go in the do it yourself direction.
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Old 10-15-08, 11:48 AM
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A low-cost solution is to use cut up aluminum can pieces as shims. Cut some strips the width of the stem and wrap a few times until you have enough.

Neal
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Old 10-15-08, 12:46 PM
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CACycling
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I've found beer cans work best for shims. Usually have to go through 2 or 3 cans of beer till I find one with just the right thickness though. It's tough but I'm willing to put in the extra effort.
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Old 10-15-08, 12:48 PM
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Originally Posted by CACycling View Post
I've found beer cans work best for shims. Usually have to go through 2 or 3 cans of beer till I find one with just the right thickness though. It's tough but I'm willing to put in the extra effort.
Lol!
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