mikew968

What amount of neg camber does the PDH like on the front and rear of a Cayman? Also is there any difference between a 275-645-18 and a 265-645-18 other than the size? The 265 is actually wider for the tread but the section is a lot wider on the 275??????

Frank 993 C4S

Mike,

Most folks run the 265/645-18 tire up front but I was told that it will only fit if you relocate the radiator brackets and roll the fenders. I've only ever seen one car with a 275/645-18 and it was at SUV ride height. Pirelli doesn't list the 275 in their race tire data booklet - not sure why. Previously, we all used to run the 245/645-18 but now I think I'm the only one in the country because I can't find used takeoffs anymore.

I've run max camber in my Gen I Cayman of up to 4.4 degrees on the outside front tire at Lime Rock and up to 3.9 deg on the inside at Watkins Glen. On my new Gen II car've backed that off by half a degree given the higher straight line speed and 200 lb higher weight and it seems to work well.

On the rear, I am as high as 3.1 deg on the outside and 2.6 deg on the inside.

The above is very much track dependent. Hope this helps.

mikew968

thanks Frank!

i am running 275 on the front with short springs and aggressively rolled fenders! i think the 265 might work a bit better.

CosmosMpower

That's a lot of tire in the front of a Cayman. I run 245/645/18 on my 997.1 GT3.

dan212

Frank - Really?? You were running 265's up front??

Frank 993 C4S

Dan - No, I seem to be the only one still running the 245s.

MRW

Me too.

Maxant13

245/645 for me as well.

007DT

Well if you guys have any 275's you want to sell let me know.. I run that on all 4 corners on my M3. Looking for more Pirelli DH

tcsracing1

i run 265 front and 305 rear DH pirellis for my GT4CS. Rears are DHA however..