tire width plymouth duster

Every car is a little different, so I would measure to be on the safe side. Remove the back rim/tire and measure from the drum face to your closest point of interference, which is usually your fender well lip. I always suspend a piece of string with a nut on one end and secured to the inner fender well lip on the other. Also look at your wheel well housings and frame rails, this determines how far "in" you can allow for backspacing. The distance between your inner most contact point (frame, wheel well, etc.) to the fender well lip represents the theoretical tire width you can use. I would subtract 1/2-3/4" at both ends for clearance. Also, the width of the rim can affect the "bulge" of the tire sidewalls, so take that into effect. Make sure and measure both wheel wells, as I've seen an inch difference between the two before on cars I've owned. This sounds like a lot of trouble, but you can figure everything out in under 30 minutes, and really get a good tire fit. Plus, it sucks to buy tires and rims that either rub, or don't fill out the fender wells like you wanted.