Regarding the initial query, are you sure the outside diameters are different? I had something similar with the old Schumacher block tyres. I found that the front blocks I had were set really for thinner than normal 4wd front wheels. When stretched to fit normal 4wd front wheels it reduced the outside diameter of the tyres. The tyresvrear were fine. In the end I just moved the inside of the front tyres further outboard on the rims so that the outside diameter on the front tyres matched the rear.
|