[Craigsmustang]

Ive got an 07 mustang GT and will be installing a set of 19" Parnelli Jones Replica wheels. The Wheel sizes are 19" x 9" in the front and 19" x 10" in the rear.

Anyone have any thoughts on tire sizes, brands and models?

Thanks

[FYouGitive]

Originally Posted by Craigsmustang

Ive got an 07 mustang GT and will be installing a set of 19" Parnelli Jones Replica wheels. The Wheel sizes are 19" x 9" in the front and 19" x 10" in the rear.

Anyone have any thoughts on tire sizes, brands and models?

Thanks

Lucky guy!

I have Michelin Pilot Sport PS2 tires on mine, 275-35 on all corners.

There are a few manufacturers that make appropriate sizes for those wheels. I chose 275s because the autocross rules allow up to that size in my class. Also, they are very little (like 2%) smaller in diameter than the standard tires, so there was no need to recalibrate the speed-o-meter.

I might have gone with 285s, otherwise.

I like the Michelins, expensive and heavy as they are, because they accommodate the deficiencies of large-wheel, short-sidewall configurations. They minimize the bumps and still maintain good "feel" of road and surface conditions. They don't do much "tramlining", and at freeway speeds show the characteristics they were designed for: stable, safe, responsive high speed touring in quiet luxury. (I should get a job as an advertising copy writer)

I had adjusted my suspension balance, with symmetrical tires/rims, front and rear, so there was neutral steering at the limit, with provocable over- and under-steer. With the wider PJs on the rear, even with same-size tires, oversteer was mild but present. Moving the front sway bar links from stiffest (tunes in understeer) to least stiff (allows more oversteer) brought it pretty much into balance.

If you go with bigger tires as well as wider rims on the rear, there will be much more understeer (car wants to go straight when you turn the wheel), and it may not be possible to compensate with air pressure differences on standard suspensions.

Ford Racing recommends installation of steering stops when installing wheels in +1 and +2 sizes. I have not installed the stops, and while there is the occasional indication of tire rub on full-lock steering, it hasn't been a significant problem.

[tw0scoops123]

Originally Posted by FYouGitive

Lucky guy!

I have Michelin Pilot Sport PS2 tires on mine, 275-35 on all corners.

There are a few manufacturers that make appropriate sizes for those wheels. I chose 275s because the autocross rules allow up to that size in my class. Also, they are very little (like 2%) smaller in diameter than the standard tires, so there was no need to recalibrate the speed-o-meter.

I might have gone with 285s, otherwise.

I like the Michelins, expensive and heavy as they are, because they accommodate the deficiencies of large-wheel, short-sidewall configurations. They minimize the bumps and still maintain good "feel" of road and surface conditions. They don't do much "tramlining", and at freeway speeds show the characteristics they were designed for: stable, safe, responsive high speed touring in quiet luxury. (I should get a job as an advertising copy writer)

I had adjusted my suspension balance, with symmetrical tires/rims, front and rear, so there was neutral steering at the limit, with provocable over- and under-steer. With the wider PJs on the rear, even with same-size tires, oversteer was mild but present. Moving the front sway bar links from stiffest (tunes in understeer) to least stiff (allows more oversteer) brought it pretty much into balance.

If you go with bigger tires as well as wider rims on the rear, there will be much more understeer (car wants to go straight when you turn the wheel), and it may not be possible to compensate with air pressure differences on standard suspensions.

Ford Racing recommends installation of steering stops when installing wheels in +1 and +2 sizes. I have not installed the stops, and while there is the occasional indication of tire rub on full-lock steering, it hasn't been a significant problem.

So do you have 9s all the way around?

[FYouGitive]

Originally Posted by tw0scoops123

So do you have 9s all the way around?

With the wider PJs on the rear, even with same-size tires, oversteer was mild but present.

No, ten-inch there. I'd like another pair of nines, but my current trajectory is toward some lighter 18x9.5 wheels with the same brand/type tires. 'most anyone will sell you 9.5s for front and rear, but not 10s for the front.

[Craigsmustang]

Thanks. Lots of good info. After the tires im planning full suspension mods (springs, struts, shocks , bars etc...) so hopefully I can dial in the staggered tires.