[Ron Sutton]

Originally Posted by Sieg

Ron - Here's my track width data:

Measured outer sidewall to sidewall front and rear. Tire width is sidewall to sidewall. Nitto NT-05's IIRCC - Dale's running Nitto NT-01 255/40/17, 275/40/17.

Front: 69.0625" 245/40/18 tire on 8" rim measures 9.5"
Centerline Track = 59.5625"

Rear: 70.875" 275/40/18 tire on 9.5" rim measures 10.875"
Centerline Track = 60.00"

Hi Sieg,

Your rear TW is 7/16" wider than the front, so that will contribute a very small amount to freeing up your car in the corners.

The 12% wider tires in the rear will contribute a larger amount to tightening up your car in the corners.

Both of those items are just two pieces of the bigger puzzle.

If ... your front geometry is like most PT cars with the KPI/Caster split favoring the KPI significantly ... that would contribute the largest amount to the car's handling being unbalanced & tight/pushy on tight corners ... until the front geometry is corrected or the rear suspension tuned to reduce grip to free the car up.

On the other hand, if you're not running track days with tight corners or AutoX, it may not matter. I surely don't know your car or situation, so I don't want to make any unfounded assumptions.

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