Tires Different tire size then what came from factory?

Turkeyman · Nov 19, 2008

I have a 4720 w/ R4's, 550 hours and will need to replace the front tires in about 100 hours. I figure if I need fronts I will just try to get bigger rears at the same time. I need the ply rating of a R4 (8-10 ply) but the traction of a R1. Has anyone changed tires sizes to something other then what came from the factory?
I looked at Michelin 11x16 R1W/R4 for the front and 19.5x 24 R4's for the rear. Firestone suggested 250/85D16.5 - R1's for the front and 16.9 x28 for the rear. I know with some of these tires I will need new rims.
Deere will only tell me the over speed ratio is 1.71 but will not suggest tires sizes.

Any help is appreciated.

Whitey · Nov 20, 2008

You need to go by either rolling or loaded circumference. It has to do with your gear ratio, tire size and MFWD. I believe that the Goodyear Titan web page has a chart. I know I went through this when I bought my JD 770.......it had R1s and I wanted R4s........Deere was no help and I gave myself a real headache trying to figure it out. I also believe that if you search these to topics on this page or others you might find past threads.

Good luck.