home made four wheel bike

REAR WHEELS

We took three front and one rear 20 inch wheels from used bicycles. The rear has 5-speed gears, but we didn't mount change-speed transmission. If you don't think about speed-change (the chain is quite long so I doubt it works well), it's a better solution to take a transmission wheel with only one gear, because the gear and chain not made for change-speed transmission are deeper and there is less chance for chain falling down from the gear.

The rear wheels are mounted on L steel profiles (E,F,G,H). For the right wheel you just need to drill a hole for the wheel axle, while on the left one (transmission) make about 3-4 cm long jag, so you can later stretch the transmission chain by pulling the transmission wheel back. Mount the drive-wheel as close as possible to longitudinal profile (A), to have chain as parallel as possible with the rear gear!

Click image to enlarge - Free plans of our bike car

The transversal distance between E-F and G-H profiles depends on the width of your wheels. Transmission wheel is usually wider! It is a good idea to make drive wheel parallel with left longitudinal profile (A) by declining drive wheels holders (E,F - green) by the same degree as the left longitudinal profile (A) - make them parallel with it. It is important to make chain (yellow), front gear (orange) and rear gear (light blue) as parallel as possible to prevent chain falling down from gears.

Parallelity of gears, longitudinal profiles and chain

Click image to enlarge - Free plans of our four wheel bicycle

right rear wheel of do it yourself pedal car

left rear wheel self made four wheel bicycle

Breaks are mounted on transversal profile B, so the longitudinal position of the hole for the wheels axis (B-dist) depends on your breaks.

Rear side of do it yourself 4 wheel bike

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