Red06

I was told by a guy in our group with 10 plus years experience that ideally, you want the wear pattern on the tires to touch the tip triangle molded into the side of the tires. I've attached a picture from the inside of my tires that shows the triangle. I was playing with the pressure and got a bit too low and wore half of the triangle off on the outside.

I'm running the 245 width tires and start around 35 cold and they get to around 41 hot. 41 pounds gets me right to the tip of the triangle less than 40 and I'm rolling past the center of the triangle. But again, I'm on narrower tires.

I'd shoot for 38 pounds like Argo and Rodeo say and check the wear pattern then adjust accordingly.

Cheers,

candymanjl

that's what I always do. ultimately every tire / car / driving style is different and will require a little different setup.

I always set my tire pressure according to the wear and that helps them to last a long time.

Sleeper_08

Thanks for the tip about the wear triangles. I have not heard about them before.

gmoran1469

I ran 35 at the last track day. Was right on the tip of the triangle, 275/40/18.

Red06

If you happen to go past the triangles, as I did, you can use some chalk, assuming it's dry, or a grease pencil to put marks on the tires to see where they are wearing.

Import_Slaya

Keep in mind that targeting the triangles involves more than just tire pressure. Camber (and even toe and caster to some degree) will also play into the wear pattern. More negative camber will shift the wear pattern away from the tire outside edge, but you may in fact be quicker. Or not, as every car is different and every driver is different.

Red06

Agreed, and taking temperatures across the surface of the tire is probably a better way of fine tuning. I'm not to that point yet but working up to it. I need to be a bit more consistent as a driver to make fine tuning worth while.

Sleeper_08

I'm not at that point either but hoping that maybe by later in the season I'll be needing a good tire pyrometer!

Import_Slaya

+3 on that. Just thought I'd put it out there for info.

candymanjl

that's the best way, take tire temps on the outside, center, and inside and use those numbers to set the pressures. from what I've read you really need a nice contact style pyrometer rather than a infrared one like the stores usually have. something like this...

http://www.summitracing.com/parts/RE...8730/?rtype=10