Join Date: Jan 2000
Location: Island Lake, IL
Re: 275/50 Drag Radial on 69???
I run 255/60/15 MT ET Street drag radials on 15x8 with 4.5" back spacing on my 69 with stock wheel wells with stock wheel well trim.
Stock ride hight with stock rear 5 leaf springs (I have comp eng. J Bolt traction bars).
These fit with no problem, and no fear of cutting a tire from the trim either.
From my research, these were the largest wheels I could fit without doing some type of modification, or being damn close to the wheel well lip. The 275 will fit, but depending on the car, you will need to run trimmed wheel whell lips and/or remove the trim.
I've run 12.10 with these with a 1.63 60ft time, so they hook just fine. No reason I could see for 20mm (3/4") wider tread. Unless you plan to pull the front wheels off the ground on the launch or use a trans brake, this tire size should work.
I also run this tire size and wheel combo with BFG Radial T/A's on the street. It fills the wheel well nicely, and again no rubbing and no drama or modification.