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!
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!
Attachments
Last edited:
