utkinpol

i run 275/335 rubber on my car which is 997.1 C2 with gt3 suspension arms, 335 tire sits on a 12" rear rim. got 'em from a guy with 997.1 gt3 car who ran same 335 tire in rear.
it is first time i hear 335 tire does not fit NB 997 car in rear, it is something new.

my CCW are c14 model:
18x9 +50mm (7" backspace), 18x12 +69mm (9.25" backspace).

I would prefer to have 9.5" in front and I beleive CCW now has such a wheel in proper offset for NB GT3 car that does not require to roll up fenders. call them and ask them - i do not know for sure.

utkinpol

they do fit fine if you rotate upper mounts to move shocks to most inward position, it gives enough space for 265 tire.
I have JRZ shocks with 2.5" springs so it gives a bit more space and I have about of half inch gap from inner edge of 275 tire to a spring. if youhave stock wide springs you may want to measure it properly or play with spacers - 5mm or 7mm perhaps.
with 2.5-3 degrees of camber in front even if it looks that tire sits on same vertical line with fender edge it will in fact dive inside as strut compresses just fine with no rubbing. it takes some effort to get it done but result is worth it.

James-GMG

What tire are you running?

MDrums, we should know more about the Trofeo R in Jan.

Mvez

for more balance, and to avoid going to extremes to stuff a 265/275 up front, all the GT3/RS needs is a 245/255 front tire and a 305/315 in the rear. Hopefully Pirelli will offer more 18" sizes, I love my RS on 245/305's (with a wider front track from a 9" wheel). Plus, keeps tire weights lower, improves braking.

Mvez

FYI - Nitto has responded to some recent requests for a NT01 305-35-18 size. Atleast they are even responding, so we need to keep requesting it.

"Thank you for contacting Nitto Tire.

Thank you for the size suggestion. We are looking into releasing more sizes in the future for the NT01. However, we do not have a set timeframe or set list of new sizes to come. We will take your suggestion into consideration for NT01 size expansion.

Thank you,
Nitto Technical Department"

mdrums

I used to runn 255/35/18 front and 315/30/18 rear and that was PLENTY of tire for a 997 car. I also ran 245/40/18 and 305/35/18 and that was equally a great combo for 18" on a 997 car. With proper alignment and good tires (RA1 and ne new R888 or Hoosier R6) these sizes will work great if you choose 18" for the track.

utkinpol

255/315 is an ideal size to run on 9/12 rims but it does not exist in most tire lines. 245/335 is too unbalanced, i tried it with RA1 and could not dial understeer out no matter what I tried.

i run now 335 RA1 in rear and 275 NT-01 in front and it works great. NT-01 is a bit softer than RA1 but grip is similar and they warm up in a similar way too, overall I like it. plus size wise 335 RA1 is taller than 275 NT01 by hlf inch - exactly what 997.1 specs want.

but from what I was told there was a guy here on 997.1 gt3 car who ran on nt01 tires with fronts half inch taller than rears and did not have any CELs. go figure.

ps. going with 335 in rear compared to 305 tire dramatically increases stability at braking and overall makes it simpler for me to steer in a sweeper on throttle. as i went initially with 265/335 i practically stopped throwing car into spin at AX. but NT01 does not have 265 size, unfortunately, only 275.

Nick Wong

Not ideal since you lose caster but thanks for the info, I can't go that route since I replace my upper mounts.
Thanks, I will see what I can figure out

mdrums

Yep but others have had ABS coming on to easy and the brakes acting weird.

Out on the track most of us are pushing it somewhat and really count on the car performing correctly so I'd stick with the correct front to rear overall ratio %

utkinpol

by the same reasoning i run ra1/nt01 combo with rears taller than fronts. i have one more brand new set of 335 RA1, as i will go over those tires i will get some solution in 255/315, hoosiers or v710 probably and will get a tire trailer. it will be easier to manage in a long run than this constant dilemma of how to combine track and street rubber.

of caster problem - it is a given that you need to install adjustable front fork arms to setup proper castor amount.
rear toe arms and front fork arms - it is a require step 1, solid steel bushings in LCAs and rear dogbones is step 2, adjustable shocks with custom springs is step 3, etc, until you run of motorsports parts to put on

Mvez

I actually contemplated running Nitto's NT555RII which comes in a 305-35-18, along with 245 NT01's, or my 245 RA1's.

I honestly think we'll see a NT01 in a 305-35-18 next year.

kkswow12

anything new on the taller rears lately...?

powdrhound

Old thread but the NT01 305/35/18 has been available for 4 years now. I run NT01 275/35/18 and 335/30/18 on 18x10x13s. Rears are 1/2 taller than fronts. Works great...

Spyerx

yes 245/305 is perfect, ratio of the 275/335 should be good too.

however, i don't think NT01 is available in germany... is it?