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Step 1: What You Need
- 1 old road bike or cyclocross tire. MTB tires are too wide.
- assorted old bike gears. a rear cluster can work. i used a 17T single-speed gear and a 13T gear from a rear cluster.
- 1/4" steel bolt, 3" long.
Step 2: Clip the Bead on the Tire
Step 3: Cut Tire to Width
Step 4: Remove Gear Cluster From Rear Wheel
Step 5: Take Apart Rear Gear Cluster
Step 6: Choose Your Gears
(1) the opening in the bigger gear
(2) your belt loops
You also don't want the bigger gear to be too big or it is going to gouge you when you bend over. ouch!
None of the little gears was really quite small enough, so i'm going to grind it down in the next step.
I ended up using a 17T gear from a single-speed bike and a 13T gear from the rear cluster.
Step 7: Attach Tire to Big Gear
Step 8: Cut Tire to Length
Step 9: Weld Crossbar Onto Small Gear
- cut the ends off the bolt until it is the right length.
- clamp onto the gear
- weld the ends onto the gear
Step 10: Grind Clasp to Size
Grind off the sides until it fits through your belt loops, and fits through the hole in the bigger gear.
Also clean up the welds while you are at it.
Step 11: Put Clasp Onto Belt
I punched holes in the tire every 1" using a leather punch. You can fold over the end of the tire and strap it into a loop by feeding wire through the holes. This will prevent the belt changing length. The belt will be sized for you, but you could change the length without too much trouble if needed.
After I did that though, I discovered that my tire made a snug fit, and the clasp doesn't slide at all even with no loop and attachment. So depending on the details you may not need to bother with the hole punching.
Step 12: Check Fit
To dis-engage first pull the clasp away from the big gear, then tip the end through the hole in the big gear.