This article is brought to you by MonkeyLectric and the Monkey Light bike light
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.