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Originally Posted by jhandy
Why would the front tires have any effect on the grip of the rears?
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They don't directly impact the performance of the rears. However, since they are made by 2 different manufacturers the tires will have different consistencies.
If you put race slicks on the front and skinny snow tires on the rear, you would expect the handling to be in-consistant front to rear due to the differences in available grip.
Tire composition (1 ply, 2 ply, 3 ply, nylon belts, steel belts, rayon belts etc) as well as the rubber all impact grip. As does tread pattern.As does temperature. As does, to an extent treadwear rating (itself a tricky, inconsistant rating that generally is accurate for "all season" type tires, but can be manipulated by a manuffacturer - ie some "R" comp tires have been "mis labeled" in this catagory.)
So.. By not getting a matched brand/style on the car, you are experiencing some performance differences. It took me a bit to notice the performance differences between the BFG KDWs the previous owner put on the rears vs the Khumo Ecstas he had on the front.
I would allow a couple hundred miles of "scrub in" to see if it gets better.. but it may not.