Tire research

[Hunner]

OOps need and inch taller tire on the drivers side.

[Hunner]

Im just thinking outloud and maybe somebody with better math skills can look this over.
I stand corrected that big ole 35 in BFG M/T is only 1.7 bigger overall and only .85 bigger in height not a full inch. It just changes your gear ratio, speedo, shift points and fuel calibration and acceleration. I know they fit cause a bunch of peeps gottum. In fact after seeing all these figures they are not enough bigger to make much difference in clearance.
BFG 35 is 34.8
Mickey Thompson 33 is 33.1
1.7 inch diff. divided by 2 is .85?
At 55 reads 57 mph which changes your odo
shift points and fuel calibration?
To get same gears you would have to drop down to 4.794.
Heck I thought they were really 35 inches and would have issues with clearance in extreme suspension articulation and mud build up.
Rim size seems to also have an effect not easily measured. Like squeezing a 34.8 tire made for an 8.5+ rim down to a 7.5 should change the footprint some. Would this also make the tire crown in the middle of the tread? When properly inflated do the edges touch the road? Hmmm
Even more facts the Mick Thompson 315 is actually 34.6 so even less difference, Im going wheeling and fergit about it! Gotta break um in!

[f5fstop]

Originally Posted by Hunner

At 55 reads 57 mph which changes your odo
shift points and fuel calibration?
I would check your odo with a GPS before assuming this. My odo is already off, reading 70 on the speedometer, but 68 on GPS devices (I checked with three so far, a Magellan Sportrak TOPO, my Pioneer AVIC NAV system, and a Garmin 60csx, and all three show 68). So if your speedo is like mine, it might only read 1 mph off.To get same gears you would have to drop down to 4.794.
Heck I thought they were really 35 inches and would have issues with clearance in extreme suspension articulation and mud build up.
Rim size seems to also have an effect not easily measured. Like squeezing a 34.8 tire made for an 8.5+ rim down to a 7.5 should change the footprint some. Would this also make the tire crown in the middle of the tread? When properly inflated do the edges touch the road? Hmmm
Even more facts the Mick Thompson 315 is actually 34.6 so even less difference, Im going wheeling and fergit about it! Gotta break um in!

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[Hunner]

I used a little calculator gizmo on the BFG site that showed that speedo diff. Im going to run down the road with my DeLorme hooked up and see what it says. I got a Garmin around here somewhere too. Im running the 33.1 Mickey so it should not have changed much if any. The Bridgestones say they are 33. Im also wondering about rpm. I think I was running 2000 rpm at 60 with the Bridgestones.
This picture is one place I was concerned about losing clearance. Now it seems in my case it would be 3/4" closer with the bigger size in a Mickey. Leaving 2" clearance. About the size of a small rock where I go. I have wedged a rock in there already with the stock tires. When that happens you let the smoke out of the tires, and that's not good!
Oh and that was shot at F3.5