Tincup's 63 Dart w/5.7 Hemi

MoparPowa said

Yeah, the Nitto's are known to run narrow and they are, although to be fair there isn't any weight on them at all without an axle or anything. Surprisingly for being a 10.5" rim the sidewall fits perfectly.. And yes, the tubs are full, but I have at minimum a 1/2" on the inside of the rails right now and I can slide 2 fingers fairly easily through the outer wheel house. I could've, with bigger wheels, fit 335's.. 13.5" section width tires in a 3200lb vehicle with 600hp, corvette's watchout! :snakeman:

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Typically the rear end manufacturers recommend at least 1" of clearance to the inside for a street car. There is another way to double check this, we know the dimension of the frame rails (outside to outside) add 2" to that number for clearance (1" per side) then Take a straight edge across the back of the tire and measure your total backspacing (wheel & tire). Add that (X2) to the previous measurement and see what you get. If you get 54.75" then that's it.
Theoretically 38" wide rails + 2" clearance = 40" + (2) 7.375"BS = 54.75" Give or take...