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Adapting a 22.2 stem for use in a 22.0 steerer

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Adapting a 22.2 stem for use in a 22.0 steerer

Old 01-25-13, 03:07 PM
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calstar 
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Adapting a 22.2 stem for use in a 22.0 steerer

I know I've read on here somewhere that removing .2mm by sanding, etc., is not critical as far as strength goes. The math goes like this, .02cm x 2.54" = .045", so removing that much mtl (45 thousandths) should be pretty simple. Thoughts?? I know one can buy one of these 22.0 quill adapters https://www.ebay.com/itm/French-bicyc...item35c3c86d03 but why bother if adapting an existing 22.2 will work fine?

thanks, Brian
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Old 01-25-13, 03:23 PM
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pierce
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uinless you can use a lathe, its darn hard to maintain roundness and centering while sanding a cylinder.
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Old 01-25-13, 04:09 PM
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You can sand down a 22.2mm ISO alloy stem to fit a 22.0mm French headset. Use a rough grit paper to start, work to fine grit wet/dry. Wrap the paper around the stem and use a twisting, rotating motion - rather than sliding the paper up and down the stem. It will be round enough. This isn't a rotating axle we're talking about, and the actual "holding" part is being done by the expander wedge and slanted stem end, the combination of which are very much not round. Anyway, I've done it and it works fine.

This is easier than the alternative, which is to hog out a French stem's 25.0mm clamp to accept a 25.4mm ISO handlebar. I've done that with a drill press and it is a pain in the butt.
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Old 01-25-13, 05:18 PM
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Originally Posted by pierce View Post
uinless you can use a lathe, its darn hard to maintain roundness and centering while sanding a cylinder.
Sheldon Brown recommends sanding a standard stem to fit a french bike, and he rarely made bad calls.
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Old 01-26-13, 10:28 PM
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Originally Posted by Airburst View Post
Sheldon Brown ... rarely made bad calls.
I think I came across one little thing he said once I disagreed with... can't remember what it was, though.
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