If all 4 rims and tires are the same size, try rotating the front to the rear. Most rims are now hub centric, which means that the rim is centered on the axle/spindle hub. This done using plastic rings that fit both the hub diameter and the inside of the center rim hole snuggly. When you have the tires balanced, do it properly, which means that the weights should be on the outside and inside if the rims. Trying to hide the weights by only putting them on the inside/backside of the rim guarantees that the tires will be pout of balance no matter what the balancing machine shows. Dynamic imbalance causes the tire/wheel assembly to wobble. Static imbalance causes the assembly to hop. Large diameter rims are also subject to getting bent easily as there is little sidewall height to act as a shock absorber when hitting ruts and potholes.
