Equal Size Tires on all 4 Corners

rbratton · 10-18-2009, 10:21 PM

I recently purchased another set of stock 19" wheels and tires and was planning to use one set on the street and one set on the track. Now I'm thinking of running one set of the rears on the front and one on the back with the stock 275 width tires. After fitting and test driving tonight, it seems like it is going to work. I'm just a little concerned about rubbing in the front with the suspension under load.

Has any one else tried this? Any thoughts or warnings? I'm heading to Putnam Park and intend to try this out next weekend.

Mike · 10-18-2009, 11:01 PM

It should be fine. I run275/35/18s all around, but they are 1" shorter than stock.

vehl · 10-19-2009, 04:42 AM

will that mean the front tyres will look 'fatter' than the rears cos the front wheels are 9' and the rears are 10'?

Mike · 10-19-2009, 11:46 AM

Quote:

Originally Posted by vehl

will that mean the front tyres will look 'fatter' than the rears cos the front wheels are 9' and the rears are 10'?

I'm sure he will be getting another set of wheels for them. I run 18x9.5 all around with my setup.

rbratton · 10-20-2009, 11:39 PM

Actually, I have four rear wheels (10") with 275 tires all the way around. I'd like to get another set of 18" wheels, but not finding a decent deal on a light racing wheels...

rbratton · 10-26-2009, 03:03 PM

I tracked the car with stock 10" wide wheels and 275 tires all the way around this weekend at Putnam Park. The decreased offset in the 10" wheels pushed the tires just outside the wheel wells, but doesn't cause any clearance issues. Performance wise, it was a drastic improvement over the stock tire setup. Turn in was much better, the car handled fairly neutral and I could easily get oversteer on corner exit as needed.

ChrisSlicks · 10-26-2009, 03:49 PM

I run a 275/35 up front on a 9" rim and there is a ton of clearance, especially after adding the SPC camber kit (which also sharpened the turn-in). Even if I did 10" all around I think I would keep a little size stagger as it lets you drive into corners a little deeper. I can still get both lift-off and power-on oversteer with a 275 front and a 305 rear.

CrownR426 · 10-26-2009, 05:28 PM

I don't think that's a good idea LOL

Island_370 · 10-26-2009, 07:59 PM

Quote:

Originally Posted by rbratton

I tracked the car with stock 10" wide wheels and 275 tires all the way around this weekend at Putnam Park. The decreased offset in the 10" wheels pushed the tires just outside the wheel wells, but doesn't cause any clearance issues. Performance wise, it was a drastic improvement over the stock tire setup. Turn in was much better, the car handled fairly neutral and I could easily get oversteer on corner exit as needed.

Is Putnam still a high abrasive track surface? I really enjoy that track, but it eats tires. Turn one is soooo fast.

rbratton · 10-26-2009, 08:32 PM

Quote:

Originally Posted by CrownR426

I don't think that's a good idea LOL

Yeah, I think 275s are a bit wide for 9" wheels.

rbratton · 10-26-2009, 08:33 PM

Quote:

Originally Posted by Island_370

Is Putnam still a high abrasive track surface? I really enjoy that track, but it eats tires. Turn one is soooo fast.

It is pretty abrasive, but there's a lot of grip and very fast. Turn 1 is awesome when you take it just right!

Mike · 10-26-2009, 08:59 PM

Quote:

Originally Posted by rbratton

Yeah, I think 275s are a bit wide for 9" wheels.

I ran 275/40-17s on my 350z with 9" wheels no problem.

ChrisSlicks · 10-26-2009, 09:08 PM

Quote:

Originally Posted by Mike

I ran 275/40-17s on my 350z with 9" wheels no problem.

Yep, been running them all year, been working great.

rbratton · 10-26-2009, 09:09 PM

You can certainly do it, but it's on the lower end of what is recommended. I'm no expert on this, but understand that tire width should be generally the same width of your wheel. A little difference each way is acceptable, but a tire that is much wider than your wheel will result in a more rounded contact patch. Ideally you want your contact patch as flat as possible. On a car with a lot of negative camber, round isn't as bad. A 275 tire is 10.82 inches wide and fits nicely on a 10" wheel.

ChrisSlicks · 10-26-2009, 09:47 PM

Quote:

Originally Posted by rbratton

You can certainly do it, but it's on the lower end of what is recommended. I'm no expert on this, but understand that tire width should be generally the same width of your wheel. A little difference each way is acceptable, but a tire that is much wider than your wheel will result in a more rounded contact patch. Ideally you want your contact patch as flat as possible. On a car with a lot of negative camber, round isn't as bad. A 275 tire is 10.82 inches wide and fits nicely on a 10" wheel.

It's not ideal for the street but works nicely at the track. The "roundness" is greatly reduced under high load, and can be refined with tire pressure. Negative camber increase is a requirement on this car, especially the front, for non-street driving. About -2.5 for track seems to be about perfect, could probably go to -3.0 for auto-x.

10-18-2009, 10:21 PM	#1 (permalink)
rbratton Base Member Join Date: Jan 2009 Location: Vine Grove, KY Posts: 89 Drives: 2009 370Z Rep Power: 16	Equal Size Tires on all 4 Corners I recently purchased another set of stock 19" wheels and tires and was planning to use one set on the street and one set on the track. Now I'm thinking of running one set of the rears on the front and one on the back with the stock 275 width tires. After fitting and test driving tonight, it seems like it is going to work. I'm just a little concerned about rubbing in the front with the suspension under load. Has any one else tried this? Any thoughts or warnings? I'm heading to Putnam Park and intend to try this out next weekend.

10-18-2009, 11:01 PM	#2 (permalink)
Mike The370Z.com Sponsor Join Date: Jun 2009 Location: Loganville, GA Posts: 5,944 Drives: 370z Rep Power: 2186	It should be fine. I run275/35/18s all around, but they are 1" shorter than stock. __________________ NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z Porsche: 93 968 / 23 Macan GTS / 93 968

10-26-2009, 03:03 PM	#6 (permalink)
rbratton Base Member Join Date: Jan 2009 Location: Vine Grove, KY Posts: 89 Drives: 2009 370Z Rep Power: 16	I tracked the car with stock 10" wide wheels and 275 tires all the way around this weekend at Putnam Park. The decreased offset in the 10" wheels pushed the tires just outside the wheel wells, but doesn't cause any clearance issues. Performance wise, it was a drastic improvement over the stock tire setup. Turn in was much better, the car handled fairly neutral and I could easily get oversteer on corner exit as needed. Last edited by rbratton; 10-26-2009 at 03:10 PM. Reason: picture doesn't work

10-26-2009, 05:28 PM	#8 (permalink)
CrownR426 A True Z Fanatic Join Date: Nov 2008 Location: South Korea Posts: 4,676 Drives: Manual Rep Power: 848	I don't think that's a good idea LOL __________________ Love + Hardwork + Passion RIP SVTRacer

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10-19-2009, 04:42 AM	#3 (permalink)
vehl Base Member Join Date: Dec 2008 Location: asia Posts: 140 Drives: 370z PW/ GTI Rep Power: 16	will that mean the front tyres will look 'fatter' than the rears cos the front wheels are 9' and the rears are 10'?

10-20-2009, 11:39 PM	#5 (permalink)
rbratton Base Member Join Date: Jan 2009 Location: Vine Grove, KY Posts: 89 Drives: 2009 370Z Rep Power: 16	Actually, I have four rear wheels (10") with 275 tires all the way around. I'd like to get another set of 18" wheels, but not finding a decent deal on a light racing wheels...

10-26-2009, 03:49 PM	#7 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	I run a 275/35 up front on a 9" rim and there is a ton of clearance, especially after adding the SPC camber kit (which also sharpened the turn-in). Even if I did 10" all around I think I would keep a little size stagger as it lets you drive into corners a little deeper. I can still get both lift-off and power-on oversteer with a 275 front and a 305 rear.

10-26-2009, 09:09 PM	#14 (permalink)
rbratton Base Member Join Date: Jan 2009 Location: Vine Grove, KY Posts: 89 Drives: 2009 370Z Rep Power: 16	You can certainly do it, but it's on the lower end of what is recommended. I'm no expert on this, but understand that tire width should be generally the same width of your wheel. A little difference each way is acceptable, but a tire that is much wider than your wheel will result in a more rounded contact patch. Ideally you want your contact patch as flat as possible. On a car with a lot of negative camber, round isn't as bad. A 275 tire is 10.82 inches wide and fits nicely on a 10" wheel.