View Full Version : Tire spacing

06-01-2019, 12:02 PM
Numbers keep changing in my old head so here goes. Presently I have tires on the Montana that have a 30.2" outside diameter, & I have 3 & 5/8" between the tires. Looking to replace with tires that have a 31.7" outside diameter, how much of that 3&5/8" am I going to loose.

06-01-2019, 01:05 PM
1.5 inches. You'll also get 1.5" closer to the top of the wheelwell.

Dual rear wheel/tire spacing is a critical element and should be done by well trained installers when changing designated sizes.

06-01-2019, 02:08 PM
I don't believe Cal is correct. From center to edge would only increase one half of the 1.5 inches or .75 inches.
However the distance between tires would shrink to 2 1/8 inches. I don't know if that would be a problem.

06-01-2019, 02:12 PM
For me the only difference is the expandable wheel chocks have to go in upside down since the adjusting bolt is unreachable now if right side up.

Walt & Vicki
06-01-2019, 03:38 PM
You will lose 1.5 inches of your 3 5/8. You divide the overall height difference in half, per tire, then add the two together for your 1.5. You will only be 3/4 of an inch closer to your wheel well. So yes, as twindman said, you will have 2 1/8 between your tires.

06-01-2019, 04:25 PM
Thanks to all for the response.

06-01-2019, 04:48 PM
Thanks to all for the response.

I changed my tires from ST235/80 to ST235/85 and I didn't have any problems 3/4" increase to inside the fender well was never a problem