Build a 4 wheel pedal bike

FRONT GEAR

Take a front gear from a bicycle (we took one with two gears and couldn't unmount one from another). The chain is different if the drive wheel (left rear) has just one gear or more gears (like most mountain bikes). So is different also the front gear. Don't do anything before you are sure, you have the right combination of the front gear, chain and the drive wheel!

Go to your local turner to make you a little tube with inner diameter as for the pedals (12 mm) and outer diameter to fit the inner diameter of the front gear. You need just a gear - if there is still a pedal of the bicycle on it, unmount or cut it away.

Front gear of Build a 4 wheel pedal bike

Click image to enlarge - Do it yourself 4 wheel pedal bike free plans

Than cut a jag in the tube made by your turner to fit the wedge in it, to connect the tube with the gear. Than drill a hole in the tube and the pedal together and put a treenail in it to connect the pedals with the tube. If treenail isn't tight fixed, use a tape to prevent loosing it from the hole.

Click image to enlarge - free plans for 4 wheel pedal bike

Don't forget: the gear should be parallel with the longitudinal profile (A) - otherwise it's very possible the chain will keep falling from the gear!

Grease all contacts between moving parts (steering, pedals) with lubricating grease or WD 40 spray.

This sites are just information about what we did. The vehicle is not done by any safety standards and can be life dangerous when producing or using it. You are free to use our design and ideas in part or in whole, but you do it absolutely on your own risk and responsibility!
If using it commercial, you must cite the source: "Designed by www.spiller.si":

INTRODUCTION
DIMENSIONS
CHASSIS FRONT WHEELS
REAR WHEELS
STEERING
STEERING WHEEL
PEDALS
FRONT GEAR
REAR GEAR
SEAT
BREAKS
LINK
OTHER LANGUAGES