Tire research

[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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