How wide tires affect overall performance

/Angelo350Z/ · 09-26-2013, 01:16 AM

The bigger the difference in front and rear tire widths, the more the car will understeer. Car manufacturers started using staggered tire sizes on sports cars mainly for safety reasons. Of course, there's also the extra grip advantage.

Jordo! · 09-25-2013, 02:26 PM

Quote:

Originally Posted by osbornsm

Generally Speaking OP:

TOO wide front tire = More Understeer
TOO wide rear = no such thing

*Note: There is such thing as having a tire too wide for the wheel also

Wouldn't an overly wide front increase oversteer?

Chuck33079 · 09-25-2013, 02:28 PM

Quote:

Originally Posted by Jordo!

Wouldn't an overly wide front increase oversteer?

Yes, too wide on either end will make the other end grip less respectively. Too wide in back, understeer. Too wide in front, oversteer.

kenchan · 09-25-2013, 09:14 AM

if you're just streeting the car, just use stock size. maybe go 285/35/19 on the rear which is nismo size.

otherwise it's really overkill imho and just weights down the car.

quality stock size tires > cheap wide tires

DEpointfive0 · 09-25-2013, 10:59 AM

Quote:

Originally Posted by Chuck33079

A 305 may be overkill unless you're putting down serious power.

Quote:

Originally Posted by kenchan

if you're just streeting the car, just use stock size. maybe go 285/35/19 on the rear which is nismo size.

otherwise it's really overkill imho and just weights down the car.

quality stock size tires > cheap wide tires

Hey, hey!!! First of all

I'm ordering my 305's today!

I want 305's because they look SEXXXY
Apples to apples, the Michelin PSS weighs 27lbs as a 275, 28lbs for a 285, and 30 lbs for a 305. Those are some of the lightest tires you can find.

RE-11's are 31lbs for the 285 and 32lbs for the 305's

So not a WHOLE hell of a lot depending on which compound you want to stick to (no pun intended) and the tires get lighter over time! Lol
Lastly, 305/30-19's are 1.3% shorter than 275/35's so the added weight might mean a hair less because now you've geared up the car

Chuck33079 · 09-25-2013, 11:01 AM

Quote:

Originally Posted by DEpointfive0

I want 305's because they look SEXXXY

This is a good enough reason.

Apoc370z · 09-27-2013, 03:17 AM

Quote:

Originally Posted by kenchan

if you're just streeting the car, just use stock size. maybe go 285/35/19 on the rear which is nismo size.

otherwise it's really overkill imho and just weights down the car.

quality stock size tires > cheap wide tires

I was worry about 305s weighing down the car, especially with the added weight of the wheels.

by no means i am looking for cheap tires, but i want something that will look good but wont affect daily driving

wheee! · 09-25-2013, 11:56 AM

whut?

wheee! · 09-25-2013, 02:57 PM

Interesting... my 305 rear and front 275's seem to be perfect balance right now. My camber in the front is -1.6 and the rear is -1.2.... on the track it seems to be extremely nimble but no loss of 'balance'. I noticed neither understeer or oversteer throughout the roadcourse.

Chuck33079 · 09-25-2013, 03:29 PM

Quote:

Originally Posted by wheee!

Interesting... my 305 rear and front 275's seem to be perfect balance right now. My camber in the front is -1.6 and the rear is -1.2.... on the track it seems to be extremely nimble but no loss of 'balance'. I noticed neither understeer or oversteer throughout the roadcourse.

You maintained the stock stagger. 245 to 275= 30mm, 275 to 305=30mm.

DEpointfive0 · 09-25-2013, 03:39 PM

Quote:

Originally Posted by Chuck33079

You maintained the stock stagger. 245 to 275= 30mm, 275 to 305=30mm.

I'm gonna not go stock stagger and get 245 and 305. I'll take the risk of understeer

245's are on clearance, and 305's are on clearance as well... Lol

FortuneLSX-TT · 09-25-2013, 03:46 PM

Quote:

Originally Posted by DEpointfive0

I'm gonna not go stock stagger and get 245 and 305. I'll take the risk of oversteer

245's are on clearance, and 305's are on clearance as well... Lol

A 60mm stagger...ouch. You won't be oversteering, you'll have serious understeer.

Your fronts will have a lot less grip compared to the rear. Meaning if you go into a corner hot, your rears will handle it and not step out. Your fronts won't have enough traction to change direction and instead of turning, they will go straighter than you'd like. With a RWD, you can always give it a bit of power to reduce the traction to the rear and try and get some power induced oversteer though.

Chuck33079 · 09-25-2013, 03:59 PM

Quote:

Originally Posted by FortuneLSX-TT

A 60mm stagger...ouch. You won't be oversteering, you'll have serious understeer.

Your fronts will have a lot less grip compared to the rear. Meaning if you go into a corner hot, your rears will handle it and not step out. Your fronts won't have enough traction to change direction and instead of turning, they will go straighter than you'd like. With a RWD, you can always give it a bit of power to reduce the traction to the rear and try and get some power induced oversteer though.

Or set the rear sway to full stiff to at least help out some.

Apoc370z · 09-25-2013, 04:09 PM

Thanks a lot for all the input, i do not wanna quote and reply to individual posts with my phone so i will do that when i am at home.

skidad62 · 09-25-2013, 05:14 PM

Will 305s on Rays clear without camber if I'm running 25mm spacers?

09-26-2013, 01:16 AM	#1 (permalink)
/Angelo350Z/ A True Z Fanatic Join Date: Feb 2013 Location: Germany Posts: 2,230 Drives: Z34 \| MK7 \| F82 Rep Power: 3661	The bigger the difference in front and rear tire widths, the more the car will understeer. Car manufacturers started using staggered tire sizes on sports cars mainly for safety reasons. Of course, there's also the extra grip advantage. __________________ 2013 MB NISSAN 370Z SPORT

09-25-2013, 11:56 AM	#8 (permalink)
wheee! A True Z Fanatic Join Date: Sep 2009 Location: Mod Capital of Canada Age: 58 Posts: 7,354 Drives: cars. lots of cars. Rep Power: 40182	whut? __________________ H&R / Stillen / Berk / HKS / Swift / Michelin / UpRev / SPC / Amuse Rep / Seibon / Fringe XVO / TWM / more... My Journal

09-25-2013, 02:57 PM	#9 (permalink)
wheee! A True Z Fanatic Join Date: Sep 2009 Location: Mod Capital of Canada Age: 58 Posts: 7,354 Drives: cars. lots of cars. Rep Power: 40182	Interesting... my 305 rear and front 275's seem to be perfect balance right now. My camber in the front is -1.6 and the rear is -1.2.... on the track it seems to be extremely nimble but no loss of 'balance'. I noticed neither understeer or oversteer throughout the roadcourse. __________________ H&R / Stillen / Berk / HKS / Swift / Michelin / UpRev / SPC / Amuse Rep / Seibon / Fringe XVO / TWM / more... My Journal

09-25-2013, 05:14 PM	#15 (permalink)
skidad62 Base Member Join Date: Aug 2013 Location: Moncton NB Canada Posts: 214 Drives: 2010 370Z Roadster Rep Power: 12	Will 305s on Rays clear without camber if I'm running 25mm spacers? __________________ 2010 370Z Black Cherry Roadster Touring Sport 2003 Mustang Vortech YSI 640 rwhp - sold but not forgotten

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09-25-2013, 09:14 AM	#4 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	if you're just streeting the car, just use stock size. maybe go 285/35/19 on the rear which is nismo size. otherwise it's really overkill imho and just weights down the car. quality stock size tires > cheap wide tires

09-25-2013, 04:09 PM	#14 (permalink)
Apoc370z A True Z Fanatic Join Date: May 2011 Location: Orange County, CA Posts: 999 Drives: 2011 GM z34 Rep Power: 15	Thanks a lot for all the input, i do not wanna quote and reply to individual posts with my phone so i will do that when i am at home.