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6

You can always brick-build a wheel. The curved slope pieces can closely approximate a circle. For example, 12 4x1 curved slopes gives a circle with a radius of 160 LDUs (8 studs). For more information on brick-built wheels, I suggest you refer to the "Brick Built LEGO Wheels Book": ...


3

The Technic Riding Cycle theme features several bikes that may be of inspiration. One particular set Moto Cross Bike (42007) uses several 3711: Technic, Link Chain parts to make a chain. Based on Bricklink prices for the last six months, 39 chain pieces (the amount shown in the set above) would cost £4.29 (Aprox. $6.91 or €1.26). Pulleys and rubber ...


4

It looks like LEGO sells chain and sprockets, don't know if you'd have them lying around though. You could also try using pulleys instead. If you don't have any of the actual pulleys, take the tread off of two wheels and stretch a rubber band across, that should work too.



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