Hi, did some testing today and found out that 3/1 is quite slow on 12 v, but it will do it. But the problem is, that i dont know how good she system will be, if i woult put a 34mm sprockets to the wheel shafts and 100mm sprockets to the motors, i dont want to use many gears because i cant get all sizes.Going to the store tomorrow and look what they have.