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Old 08-05-08, 02:54 PM   #1
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Cheap 22mm disc brake adapter for older Trek/GF bikes

I was recently asked for my plans for a disc brake adapter I made for a neighbor-kid's GF a few years ago. I couldn't find my drawings; but I scratched around in my garage and found my first prototype and measured it up for the requester. After I got done and PM'd him, I thought maybe more people could benefit from my little bit of ghetto/shade-tree machine work. This adapts 51mm IS disc brakes to the old 22mm vertical-holed chainstay mounts on Treks and GFs.

I know, the store-bought ones don't cost that much; but if you're handy and happen to live near a city with recycling yards that will sell you aluminum scrap by the pound, you can make one yourself for a little bit of nothing.

I made this from a piece of 1x1x" 6061 angle. The 22mm holes need to be pretty close to the inside face (11mm), so with that thick of walls, you see I needed to relieve some vertical 'troughs' to accept the bolts/washers/aircraft lock nuts. I did these with a straight-shouldered bur bit for a Dremel. You could freehand it with a Dremel, of course, or chuck it in a drill press and 'precision bore' them if you choose.



Originally Posted by Mark Twain
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Old 08-06-08, 08:11 AM   #2
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That's a great DIY Doug! Thank for sharing.
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Old 11-06-12, 10:27 AM   #3
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thanks so much for sharing!

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Old 11-06-12, 10:43 AM   #4
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I get a sense that you have a fun garage.
I think its disgusting and terrible how people treat Lance Armstrong, especially after winning 7 Tour de France Titles while on drugs!

I can't even find my bike when I'm on drugs. -Willie N.
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