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Old 08-11-2009, 11:34 PM
Nashville Kat's Avatar
Nashville Kat Nashville Kat is offline
Motorized Bicycle Elite Member
Join Date: Apr 2009
Location: Jacksonville, Florida
Posts: 1,403
Default Your Bicycle is a great hub grinder!

Got an old traditional ten-speed or mountain bike alloy hub you don't think the sprocket will fit?

Take a good look at the hub: if it is like most, theres lots of alloy there on the other side, and I think the threads on the frewheel side may just be cut into the same kind of piece-

I just ground down the side of a traditional Schwinn 10 speed hub simply by turning the bike over, and holding a flat metal file against it as I pedalled the wheel.

It's it's own grinder! Hold the file about halfway across the bare alloy side and it cuts a nice groove that stops the sprocket about an eighth of an inch from the flange-

The alloy grinds easily, and there's a lot of thickness there- but take care! My old standard sprocket now fits over this, but I'm not ready to put a motor on yet. Takes several minutes.

Also here is 34 tooth sprocket I got on ebay (seller dadjohnr) for about $10 shipped, and I've drilled 8 holes in it to bolt directly onto the large flange hub-

(I'll have to take this one still somewhere else to get the middle hole drilled to the usual size, but I may try grinding it myself- as you can see, it's quite minimal, 34 teeth, and if I can get it attached this way, will be EXTREMELY lightweight.)

Also notice it's OFFSET out at the teeth, to keep it away from the frame's chain stay!
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Last edited by Nashville Kat; 08-12-2009 at 12:29 AM.
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