Celsior Master

I currently have 245/35-19 and 275/30-19. I was thinking of going fat with 40 up front and 35 in back but has anyone done 245/35-19 and 275/35-19?

rominl

iTrader: (4)

not sure if anyone has done it before, but personally i wouldn't i would just get 40 in the front and 35 in the back. i don't want to see more profile in the back, it's like a "thicker" wheel in the back than the front

Celsior Master

right now i have 35 fr and 30 rr and my back looks thinner. that bothers me even more.

and im just afraid of the 40s up front rubbing cuz im am almost certain they will

since my tires wear very differently (im on my 3rd set of fronts but still on the original rears) i might just throw on 35 on the back and then if its not good i can just do 40 front a couple months after

rominl

iTrader: (4)

very interesting, you have 245 and 275 right? if so, that's weird coz' they both (35 front and 30 rear) should come out to have almost identical sidewall. i wonder if it has anything to do with the kind of lip size you got front and rear.

of course you can make the final call to get 35 in the back and stay with 35 in the front, nothing really wrong with that. just that i have never seen that done before

Celsior Master

the difference in sidewall is either because my fronts are michelin ps2 and my rear is yokohama avs and/or my rears are the first set ive had on (since 2000) while my fronts are 2 months old.

rominl

iTrader: (4)

ah, actually it's both. the avs are know for being very thin and stiff, that's why it looks "thin" on the profile. on the other hand the ps2 is on the beefy side so it looks thick. and the rear probably has less treat than the front too, and it will give you the same illustration

ikankoi

i am curious about it also. ive been lurking to G35drivers.com and I notice that the recommendations are 245/35 and 275/35 for 19" staggered 8.5/9.5. is it because G35 and GS has different stock wheel size? i dont think so since we are looking at the final overall diameter of the wheel, or am i missing something here?

GATO

iTrader: (1)

forget me if this is a dumb question.....but why do most rides use a thiner profile tire in the back.

I mean to me it makes more sense and would understand it bettr, if the thiner profile was up front...using the bigger profile in back. why do ya'll use otherwise???

rominl

iTrader: (4)

oh yeah, i forgot about that!!!! yes, on the rear of the z and the g35, the recommended size is 35 in the back for 275/19!!! when my friend got that i went huh as well, but seems like that's the spec?

rominl

iTrader: (4)

well, that goes back to what the number means.

the second number in the tire spec (profile the way you call it), it's actually an aspect ratio. so it's a % of the width. and that explains why it's "smaller" in the back, coz' you have a wider rear tire

so if you do the math, on 245/35/19, the sidewall is 35% of 245, and on 275/30/19, the sidewall is 30% of 275

if you do the math, you will see that they are very close to each other so you get the same profile physical size front and back

KRGS4

I run 245/40 19s up front in the spring/summer. Lowered 1.5 Eibach Pro Kit. There was very very very very minor rub on the small vents in the tire well *The ones that luuk like inverted vents.

I too a heat gun to them for about 3-5 minutes and pressed them in...smoothed them out.

I have abosoultely no rubbing issues now. even at full lock turns, bumps,etc. The 40 height is has the best of both worlds. Good handling and still a plush ride.