RCZ's 370Z Journal.

RCZ · 04-17-2011, 10:18 PM

Hey ZForce,

I think you will be fine with the 255 and those spacers up front. There's plenty of room in those fenders. I would even go 265/285. I think thats a great combo for the car. Someone had the 265/305 combo on their stock wheels and spacers, but you're gonna have to look it up. Not sure who it was...maybe repipsa?

Try and get as much tire under the front fenders as possible, this car tends to understeer when you start playing around with bigger rears and grippier tires.

I have 265/305 right now and haven't had a chance to really put them to the test yet

ZForce · 04-19-2011, 01:04 AM

Quote:

Originally Posted by ZForce

Thanks man, I am thinking of going with stock up front (245/40) and 285/35 in the rears. The difference (1.57) in the

section width between the two staggered sizes is the same as the 265/35 & 305/30 combo. It's up from the OEM staggered tire difference of 1.18

255/35 was a thought but with the spring drop (1.2) it might drop too much and rub with 20mm spacers.

Quote:

Originally Posted by RCZ

Hey ZForce,

I think you will be fine with the 255 and those spacers up front. There's plenty of room in those fenders. I would even go 265/285. I think thats

a great combo for the car. Someone had the 265/305 combo on their stock wheels and spacers, but you're gonna have to look it up. Not sure who it

was...maybe repipsa?

Try and get as much tire under the front fenders as possible, this car tends to understeer when you start playing around with bigger rears and

grippier tires.

I have 265/305 right now and haven't had a chance to really put them to the test yet

Actually you are dead on with suggesting 265/35/19 & 285/35/19. The 265 is closer to the stock ratio than the 255. And the section width

difference between the two staggered sizes is 0.79, that is better than the stock staggered differences at 1.18.

I am really eye balling the combo you recommend. Can you get up driveways without scraping on your 265's ?

I will have to search on...repipsa

Here are some numbers off of Americas Tire Calculator Tire Dimensions Made Simple - Discount Tire

Results......................245/40/19.....265/35/19
Totals are in inches...........Tire 1......Tire 2........ Difference
Sidewall Height:................ 3.86......3.65........... -0.21
Section Width:...................9.65......10.43.......... . 0.78
Overall Diameter:...............26.72......26.3........... .-0.42
Circumference:..................83.93......82.63.. ......... -1.3
Revs per mile:

Results......................275/35/19.....285/35/19
Totals are in inches...........Tire 1......Tire 2........ Difference
Sidewall Height:................ 3.79......3.93........... 0.14
Section Width:..................10.83......11.22.......... . 0.39
Overall Diameter:...............26.58......26.85.......... . 0.27
Circumference:..................83.93......82.63.. ......... 0.87
Revs per mile:

COMPARISON OF STAGGERED SIZES

Results......................265/35/19.....285/35/19
Totals are in inches...........Tire 1......Tire 2........ Difference
Sidewall Height:................ 3.65.......3.93.......... 0.28
Section Width:..................10.43......11.22.......... 0.79
Overall Diameter:...............26.58......26.85.......... . 0.27
Circumference:..................83.93......82.63.. ......... 0.87
Revs per mile:

Results......................245/40/19.....275/35/19
Totals are in inches...........Tire 1......Tire 2........ Difference
Sidewall Height:................ 3.86.......3.79.......... -0.07
Section Width:...................9.65......10.83.......... 1.18
Overall Diameter:...............26.72......26.58.......... -0.14
Circumference:..................83.93......83.5 .......... -0.43
Revs per mile:

wstar · 04-19-2011, 01:39 AM

I'm running 275/35 + 295/35 now (on 18x10 + 18x11 wheels though). Forgestar picked the offsets, no spacers involved. My 275's are just a little too wide for the front fender well, but the setup works well (slight oversteer). The 295's fit in the rear just fine though, with a little room to spare. On my wheels, a perfect flush fit taking up all the available room would probably be 265 + 305, but then I think there'd be too much relative grip in the rear and maybe get into understeer.

04-19-2011, 01:39 AM	#3 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3596	I'm running 275/35 + 295/35 now (on 18x10 + 18x11 wheels though). Forgestar picked the offsets, no spacers involved. My 275's are just a little too wide for the front fender well, but the setup works well (slight oversteer). The 295's fit in the rear just fine though, with a little room to spare. On my wheels, a perfect flush fit taking up all the available room would probably be 265 + 305, but then I think there'd be too much relative grip in the rear and maybe get into understeer. __________________ 7AT Track Car! Journal thread / Car setup details

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04-17-2011, 10:18 PM	#1 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1120	Hey ZForce, I think you will be fine with the 255 and those spacers up front. There's plenty of room in those fenders. I would even go 265/285. I think thats a great combo for the car. Someone had the 265/305 combo on their stock wheels and spacers, but you're gonna have to look it up. Not sure who it was...maybe repipsa? Try and get as much tire under the front fenders as possible, this car tends to understeer when you start playing around with bigger rears and grippier tires. I have 265/305 right now and haven't had a chance to really put them to the test yet