Tire size question

getshawty · 10-07-2016, 08:54 PM

Iv done a search and found out that I can fit 305's on the standard Rays but I carnt find the exact answer to this.
Iv lowered the car on coilovers approx 50mm now the standard Tyres are
Front 245/40 diameter 678.6mm
Rear 275/35 diameter 675.1mm
Can I fit
Front 255/35 diameter = 661.1mm
Rear 305/30 diameter = 665.6mm

The difference is 3.5mm standard and 4.5mm new size

Iv heard wider rear and skinny front may sometimes create understeer but I don't drive my car like I stole it so this won't be a problem, I just want to know if I can fit these new sizes without the car bringing any warnings lights on thinking a tyre is spinning.
Thanks for any advice.

BobbyLight · 10-11-2016, 02:05 PM

305 is too wide for the rim in my opinion. Bigger isn't always better, and that 305 will slow you down especially if you are N/A.

getshawty · 10-14-2016, 08:20 AM

OK if it's too wide, what about
Front 255/35/19 diameter = 661.1mm
Rear 295/30/19 diameter = 659.6mm

This size there's just over 1mm difference?

Silverback204 · 10-14-2016, 12:59 PM

Becareful, I put new rims on my car and the car shut down.
Speedo won't work, abs, traction and Ikey.
Tires must have at least 3% tollerance I heard

getshawty · 10-17-2016, 10:17 PM

I definitely don't want that but the standard size is 0.53% from front to rear different and the 255/35 295/30 is only 0.23% different so I'm assuming this would be OK.
Are there any members that have done this as i need new tyres soon or is there a site that I can ask that will know the answer.

Brendan · 10-18-2016, 12:35 AM

Quote:

Originally Posted by Silverback204

Becareful, I put new rims on my car and the car shut down.
Speedo won't work, abs, traction and Ikey.
Tires must have at least 3% tollerance I heard

What sizes?

axmea? · 10-18-2016, 01:11 AM

OP --- it'll work. I had the exact tire sizes on OEM sport rays before getting new wheels. Looked good with 20 mm spacers all around. No warning lights or anything like that.

shirokenkami · 10-29-2016, 10:59 AM

If you go too wide of a tire on a narrower rim it's going to flex the side wall and even the treads themselves thus creating a danger. You might get away with some extra width but too much can be detremental.

http://rimringz.com/product_images/u...o-tire-fit.jpg

Here is a site I use to calculate what tire width you'll want for the width x diameter.

Tyre Size for Rim Size/Width Calculator - What's the best tyre size for my rim?

JerryDeluxe · 10-29-2016, 05:11 PM

Stock rims get stock size tires , aftermarket rims get custom size tires imo

10-07-2016, 08:54 PM	#1 (permalink)
getshawty Base Member Join Date: Aug 2016 Location: Derby Posts: 5 Drives: 370z Rep Power: 9	Tire size question Iv done a search and found out that I can fit 305's on the standard Rays but I carnt find the exact answer to this. Iv lowered the car on coilovers approx 50mm now the standard Tyres are Front 245/40 diameter 678.6mm Rear 275/35 diameter 675.1mm Can I fit Front 255/35 diameter = 661.1mm Rear 305/30 diameter = 665.6mm The difference is 3.5mm standard and 4.5mm new size Iv heard wider rear and skinny front may sometimes create understeer but I don't drive my car like I stole it so this won't be a problem, I just want to know if I can fit these new sizes without the car bringing any warnings lights on thinking a tyre is spinning. Thanks for any advice.

10-18-2016, 01:11 AM	#7 (permalink)
axmea? A True Z Fanatic Join Date: Apr 2012 Location: SoCal Posts: 6,235 Drives: WELL ZED PW 6MT Rep Power: 53241	OP --- it'll work. I had the exact tire sizes on OEM sport rays before getting new wheels. Looked good with 20 mm spacers all around. No warning lights or anything like that. gomer_110, Brendan and getshawty like this. __________________ >MyZ's Album< NISMO Convert/ECUTEK/Takeda CAI/F.I. HFC NR CB Carbon/F.I. 34 Row Oil Cooler/4.08 Final Drive /Powertrix+Swifts/Hotchkis/SPL/Whiteline/TWM/Zoom Engineering/EVO-R/AeroJacket Vented CF Fenders + CF Spoiler/Avant Garde-WORK/NST/Morimoto Halo/STi Clear Lenses/Carbon Signal Automotive/RJM Performance/ZSpeed Clutch Flywheel CSC delete

10-29-2016, 10:59 AM	#8 (permalink)
shirokenkami Base Member Join Date: Oct 2016 Location: Middle Tennessee Age: 38 Posts: 232 Drives: 2013 Z Tour Spt 6mt Rep Power: 23	If you go too wide of a tire on a narrower rim it's going to flex the side wall and even the treads themselves thus creating a danger. You might get away with some extra width but too much can be detremental. http://rimringz.com/product_images/u...o-tire-fit.jpg Here is a site I use to calculate what tire width you'll want for the width x diameter. Tyre Size for Rim Size/Width Calculator - What's the best tyre size for my rim? __________________ “The only thing necessary for the triumph of evil is for good men to do nothing.”- Edmund Burke

10-29-2016, 05:11 PM	#9 (permalink)
JerryDeluxe Enthusiast Member Join Date: Aug 2015 Location: San Diego, Ca Posts: 277 Drives: 16' 370z auto sport Rep Power: 10076	Stock rims get stock size tires , aftermarket rims get custom size tires imo __________________ Swift Spec R/KONI Yellow Shocks, SSR Executor CV01, GThaus, CF Lipkit, CF Hood/Fenders

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10-11-2016, 02:05 PM	#2 (permalink)
BobbyLight Base Member Join Date: Apr 2016 Location: Charlotte, NC Posts: 97 Drives: 09 370z BS 6MT Rep Power: 9	305 is too wide for the rim in my opinion. Bigger isn't always better, and that 305 will slow you down especially if you are N/A.

10-14-2016, 08:20 AM	#3 (permalink)
getshawty Base Member Join Date: Aug 2016 Location: Derby Posts: 5 Drives: 370z Rep Power: 9	OK if it's too wide, what about Front 255/35/19 diameter = 661.1mm Rear 295/30/19 diameter = 659.6mm This size there's just over 1mm difference?

10-14-2016, 12:59 PM	#4 (permalink)
Silverback204 Base Member Join Date: Sep 2016 Location: Canada Posts: 9 Drives: 2016 370z Rep Power: 9	Becareful, I put new rims on my car and the car shut down. Speedo won't work, abs, traction and Ikey. Tires must have at least 3% tollerance I heard

10-17-2016, 10:17 PM	#5 (permalink)
getshawty Base Member Join Date: Aug 2016 Location: Derby Posts: 5 Drives: 370z Rep Power: 9	I definitely don't want that but the standard size is 0.53% from front to rear different and the 255/35 295/30 is only 0.23% different so I'm assuming this would be OK. Are there any members that have done this as i need new tyres soon or is there a site that I can ask that will know the answer.