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Pedal wrenchStep one: Borrow a pedal wrench.
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Take off the pedalsStep two: Take off the pedal. But only the pedals.
Take off the pedals
If your little biking kid is ready to ride, you can turn any little bike into a run bike.
Step one: Borrow a pedal wrench. If you don't have your own, any friendly bike shop could lend you one for a few moments. Check out the picture above to see what a pedal wrench looks like if you are searching for one in someone else's tools. (Not that I'm ever in that situation myself!)
Step two: Remove the pedals. All you need to take off are the pedals. Leave the crank arm (that's what the pedal is attached to) in place. The pedals will unscrew in different directions depending if they are right foot pedals or left foot pedals. One pedal is reverse threaded. Don't worry, you'll figure it out.
Step three: Lower the seat as low as it can go so your little biker can be flat footed for starts and stops.
P.S. Word of warning: Don't be too quick to put the pedals back on. Jasper's eager friends convinced him to put his pedals back on last spring long before he had his balance or really knew how to steer. That led to some spectacular crashes. And it's discouraging for the young rider to have an on again off again relationship with pedals.