Help with tire clearance issues!
 

I need some advice. I have the mods listed below with five-lug cobra r's. I have no idea what offset the wheels are. Up front I am running 245/40 and 255/40 in back. The problem is that my right rear tire extends past the fender well and is being ripped apart every time I hit a decent bump at speed. The left rear is noticeably further in but still makes contact on very hard bumps or a very big load, as do they front tires. What tire can I go with in back to get rid of this? Does the difference between a 40 and 50 series tire relate to the width at all, or just sidewall height?Would a 245/50 work? Help! Any input is appreciated.


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90 LX Convert - Griggs GR-40 Street Kit, GT-40 Irons, Cobra Intake and MAF, Auburn 3:55, Full Frames and 8 point cage, 5 lug. Stiff and Strong, like a camp counselor.

As to the tires. The width is the first number ie. 255 in milimeters, divide by 25.4 to have side wall width. the next number ie 55 is the mutliplier to determine tire height. Multiply the tire width by the multiplier to get tire height. Double height and add to wheel diameter to get over all tire wheel diameter ie.
255/25.4=10.04 inches wide at side wall.
10.04*.55= 5.52 inches tall tire.
5.52*2+ wheel diameter 17 = over all wheel height. All of this information is available in an easy to understand on the Tire Rack Web site www.tirerack.com.