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Old 10-26-10, 10:15 PM   #1
etherhuffer
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Headset race too 'thin' Schwinn World Voyager 1974

The crown race and top race are pitted and grooved on this old thing, but the cups look good. The amount of hard chrome on this old headset is pretty amazing.

So I got a couple of races and banged em home. Problem is the crown race. It fits the fork fine(27.0) but its not as tall(thick) as the original. Calipers say 10mm. The replacement one is thinner, and the fork crown hits the bottom of the cup. The cup is similar to a Tange Levin, with the roundish shape.

Any ideas on keeping the original cups and finding a better race? Gads, these old bikes.........
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Old 10-26-10, 10:55 PM   #2
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Doubt you're gonna find a 10mm crown race. Most I've seen are 4-5mm thick. The other issue is having the curvature matched properly so the balls will roll in the centre rather than off one edge.

Personally I would just replace the entire headset. They seem to last forever with proper service and adjustment. I've got a 105 headset that's 25-years old on its 4rd bike now. And my favourite, a Stronglight alloy & needle-bearing headset that's 20-years old on its 3rd bike.
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Old 10-27-10, 10:20 AM   #3
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You could try a 5mm shim under the race.
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Old 10-27-10, 11:24 AM   #4
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Originally Posted by Booger1 View Post
You could try a 5mm shim under the race.
Good idea. Any thoughts on where to find such a spacer?
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Old 10-27-10, 01:05 PM   #5
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Seems that all of the newer ones are about 5mm thick or so,maybe start with one of those and do a little grinding on a bench grinder if need be or flip it upsidedown and use 2 of them.Go to your local LBS and look for some headset spacers that will work.

It's easy for me,I'd just make one,I'm a machinist.It doesn't have to be steel,you can use aluminum for a shim,much easier to work with at home.

Last edited by Booger1; 10-27-10 at 01:10 PM.
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Old 10-27-10, 01:20 PM   #6
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Originally Posted by Booger1 View Post
You could try a 5mm shim under the race.
Will the shim be thinner than the height of the seat on the crown? You'd need to make a stepped shim that will touch the race underneath and on the inside. Due to the thinness of the material at the step, you'd want to use something stronger like steel or beryllium.

Last edited by DannoXYZ; 10-27-10 at 01:25 PM.
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