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I think you guys are bass-ackwards on your shift point thinking. If the car shifts by MPH from the rear wheels, then a taller rear tire will make your shift point (rpm) higher. A smaller tire will see more revolutions of the tire at a given MPH. So the car will THINK it’s doing 60mph when in fact it’s only doing 58 mph.
I just put a set of the 275 35 20 Nitto 555r2’s on my car yesterday. The stock LT1 with run flats says they are 27.77 inches diameter according to the tire spec. The 555r says it is 27.56. Pretty close so I went with it. The car shifts at 6300 rpm in full auto. I didn’t pay attention to where it shifted before I put the tires on but plan on switching back in order to check. My phone GPS shows the car to be off by 1 mph. The car will show 60mph when my phone GPS shows 59mph.
Despite the measurements per the specs, here is a side by side of the stock 245 against the Nitto 275/35. I’ll tell you what the REAL measurements are in the next few days as I’m going to measure them.
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