245s vs 285s

[N2BRK]

NUFN - I was looking through the application guide for BF T/A KO's and noticed one hell of a weight difference between the stock and 285/75 tires. That could certainly play a factor in city driving, trying to get 10lbs/tire of rotational mass to get going... significant to matter?? yes/no?

[delawitt]

I have been looking at new tires and bigger of course but don't want to lower my RPMs too much when towing, I'm not to concerned about every day driving but I came across this calculator that will allow you too put in such parameters as
Final Gear Ratio:
Transmission Gearing Ratio:
Tire Diameter in Inches:
Tire Growth Factor in Inches Per MPH Squared:
Transmission Slip Factors:
Transmission Efficiency(%)
and then calculate an RPM. This would be useful when making any decision to go bigger with tires. Here is the web site if anyone is interested.
RPM Range Computation

[n0useforaname]

Originally Posted by N2BRK

Did you account for the difference in distance traveled with the larger tires, or had your odometer adjusted for the new tires size each time?

Thanks!
Wally

Yes, and I even double checked it with road markers and my GPS. I was VERY anal. I'm not anymore, but I did a lot of research at the time....my wife actually got sick of me!

[Tow Master]

265's will be a big difference in looks and wont hurt your MPG's that mutch. I have 285's and it kills around town and highway MPG. Id get the 265's. IMO you'll be happy!