Trying to figure out which tire size to buy

[Cornfield creations]

I am trying to figure out if I can run a 315/75/16. I have a 4" TC lift, and I went to a 16x8 rim, 3.625 backspace.

I ran a search as to the difference between the 315/75/16- 305/70/16- and a 33x12.50/15. Going down the list they are in that order. The 315 vs. the 33's that I have is abot 2 inches taller, but slightly narrower, plus running an 8" rim would make them crown a bit, so I am thinking I may fit them with only a 4" lift. Is my reasoning correct, or am I gonna have major rub issues?

This is the calculator I used.


http://www.1010tires.com/TireSizeCalculator.asp




Tire 1 - 315/75R16 >Search Tires Tire 2 - 305/70R16 >Search Tires Tire 3 - 33x12.50R15 >Search Tires
Section Width: - -
Section Width: 12.40 in 315 mm
Section Width: 12.00 in 305 mm
Section Width: 12.51 in 318 mm
Rim Diameter: - -
Rim Diameter: 16 in 406.4 mm
Rim Diameter: 16 in 406.4 mm
Rim Diameter: 15 in 381 mm
Rim Width Range:
Rim Width Range: 8 - 10 in
Rim Width Range: 8 - 9.5 in
Rim Width Range: 8.5 - 11 in
Overall Diameter: - -
Overall Diameter: 34.60 in 878.84 mm
Overall Diameter: 32.81 in 833.37 mm
Overall Diameter: 32.52 in 826.00 mm
Sidewall Height: - -
Sidewall Height: 9.30 in 236.22 mm
Sidewall Height: 8.40 in 213.36 mm
Sidewall Height: 8.76 in 222.50 mm
Radius: - -
Radius: 17.30 in 439.42 mm
Radius: 16.40 in 416.56 mm
Radius: 16.26 in 413.00 mm
Circumference: - -
Circumference: 108.6 in 2758.4 mm
Circumference: 103.0 in 2616.2 mm
Circumference: 102.1 in 2593.3 mm
Revs per Mile: -
Revs per Mile: 601.1
Revs per Mile: 633.9
Revs per Mile: 639.6
Speedometer1: mph km/h
Speedometer1: mph km/h
Speedometer1: mph km/h
Speedometer Difference: % Speedometer Difference: % Speedometer Difference: %
Diameter Difference: %

 

[dfl701]

You will be ok with the 315s. It's what I run and no rubbing issues at all.