My convertable, 66' was severely traction limited with the 235/70/15s that I had installed on the car, (640 ft.lb. torque HEMI.) The car weighs 4K, has a 3.54 gear in the Dana and acted like it was on ice with any throttle applied. I was told that a 275/60/15 wouldn't fit. In frustration, I borrowed a friends 275/60/15 M&H drag radials on 7"x15" Mopar "steelys" just to see for myself. They fit! and they hook! The temp was maybie 50 degrees, I didn't do a burnout to heat the tires but after a 10 mile cruise, I stopped and applied 1/2-3/4 throttle. The car EXPLODED! The sunvisor came loose and nearly decapited me! About 20' out, the tires let loose for mabie 10' and then hooked up for good. What a ride! I have had some fast cars, (still have a 11 second ride) but I have NEVER had a car leave so hard! For all of you who wonder, a 275/60/15 WILL fit a 66' B body, and it is well worth it!