Racing tires

[Hakeeb]

What size hoosiers do they sell at VAR for the sport compacts and how much are they?

[C.Wenzel46]

100+ once heard they were in excess of 120 but that was a couple years ago. Might be lower now. Plus your only going to find 13's.235-60 is the biggest I believe!!! You dont need them though, I led over 10 laps with DOT's

[Nerd49]

Originally Posted by C.Wenzel46

100+ once heard they were in excess of 120 but that was a couple years ago. Might be lower now. Plus your only going to find 13's.235-60 is the biggest I believe!!! You dont need them though, I led over 10 laps with DOT's

The only racing tire sizes I've seen are either 13" or 15". 13" wheels may not clear your brake calipers. I have to run 15" on my Nissan because of the brakes. 13" racing wheels also only come in 4 lug pattern unless you do some sort of custom order. 5 lug are all 15". I happened to find a Bart "multifit" wheel that had 4 on 4.25 and 4 on 4.5 lug patterns on the same wheel. They're 15" which means the smallest circ. tire you can get is a 245/60-15 which is 84". that's prob going to mess with your gear ratio. And if you don't have a lot of torque in your motor, they'll prob bog your motor. I did get Mike to allow non studded snow tires since 14" racing tires don't exist.

[Hakeeb]

Originally Posted by C.Wenzel46

100+ once heard they were in excess of 120 but that was a couple years ago. Might be lower now. Plus your only going to find 13's.235-60 is the biggest I believe!!! You dont need them though, I led over 10 laps with DOT's

What size tires are you running? how do they measure the 8.5 inches? Is it tread width or section width?

[Nerd49]

The tire size he's running may or may not be the correct size for your car. You need to find out your final drive ( diff gear ratio times your tranny gear) and what RPM you want your motor to run at. If you find a "final drive" on a website that has your car specs that will actualy be your diff gear ratio.

Once you get those numbers, take 4200000 and divide your numbers into it. (4200000 comes from what I've managed to pry out of the Ford drivers for their final drive, etc.)
My car for example:
final drive 7.75
RPM 6000-6300
4200000/ 7.75/ 6000= 90 = circ of tire/ 3.14 = 28.5" dia
4200000/ 7.75/ 6300= 86 = circ of tire/ 3.14 = 27.4" dia

you'll prob find yourself more in the 8's for final drive and tire dia more in the 25" range based on other "rice burners" I've looked up.

Once you find your dia. You can find tire sizes on Tire Rack - Your performance experts for tires and wheels.

Tread width is 80-85% of the section width depending on manufacturer. There's a good tech article on this site that decodes the numbers on the tire sizes. I believe it was titled "Am I using the right tire?"

[Hakeeb]

I was asking how wide of tire he is running. I am wondering if I should go with 215, 225, 235, or 245. The 195's I am running are just not working out for me

[Nerd49]

I believe he was around 7" tread width which would be like 215-225 and I'm prob gonna get another bumper tag in hot laps for telling you, but oh well, you're gonna be one more Ford muncher on the track!

In theory, wider is better. More contact area, better grip. I'd try going as wide as you can without rubbing something.

[Hakeeb]

yeah like I am a threat on the track

[C.Wenzel46]

8.46 in

[Nerd49]

Originally Posted by C.Wenzel46

8.46 in

Ahhhh, typical man, bragging about the size of his rubber!