Tire load index

370z209 · 02-26-2015, 06:50 PM

Just wondering but would it be okay to run a load index of 92 in the front if the rears are 97? I dont carry anything else in my car besides the wifey. Her and I are probably around 280lbs total.

Current wheel and tire specs:
20x9.5 255/35/20 97
20x11 305/25/20. 97

Have an extra set of the following:
255/30/20 92

Brendan · 02-26-2015, 07:23 PM

I think you'll be fine.

http://www.tirerack.com/tires/tirete....jsp?techid=35

The tires will be able to carry a max load of 5,996 lbs.

370z209 · 02-26-2015, 08:54 PM

Thats what I told the guy at American Tire but due to there regulations he said he cant Mount the tires.

Brendan · 02-26-2015, 09:52 PM

That seems odd. You never want to force a shop into doing work they don't want to do but did he show you the regulation in writing? That seems like useful information.

cv129 · 02-27-2015, 07:44 PM

I think static weight of the car is not as important as the weight + additional load the tires have to endure when you hit a pot hole/curb/bump. On a scale, my left front weights 972lbs, so around 945lbs without the tire itself. But rest assure, there's a lot more force acting on the tires when you run over obstacles, or during heavy braking, or cornering, or all at the same time.

I'm sure the oem load rating requirement has safety margin built-in. How much of that can you safely forgo? I don't know.

02-26-2015, 06:50 PM	#1 (permalink)
370z209 Base Member Join Date: May 2014 Location: Bay Area Posts: 114 Drives: 2015 S4, 2015 A3 Rep Power: 10	Tire load index Just wondering but would it be okay to run a load index of 92 in the front if the rears are 97? I dont carry anything else in my car besides the wifey. Her and I are probably around 280lbs total. Current wheel and tire specs: 20x9.5 255/35/20 97 20x11 305/25/20. 97 Have an extra set of the following: 255/30/20 92 __________________ MEISTERSCHAFT \| SWIFT \| SPL \| WORK\| NISMO \| PROJECT KICS\| AEROJACKET Soon to be for sale: - Muteki 32901N Neon Chrome SR48 Open End and Locking Lug Nuts - Forgestar F14 19" 19x9 ET=21 Semi Concave 19x11 ET=24 Deep Concave

02-26-2015, 08:54 PM	#3 (permalink)
370z209 Base Member Join Date: May 2014 Location: Bay Area Posts: 114 Drives: 2015 S4, 2015 A3 Rep Power: 10	Thats what I told the guy at American Tire but due to there regulations he said he cant Mount the tires. __________________ MEISTERSCHAFT \| SWIFT \| SPL \| WORK\| NISMO \| PROJECT KICS\| AEROJACKET Soon to be for sale: - Muteki 32901N Neon Chrome SR48 Open End and Locking Lug Nuts - Forgestar F14 19" 19x9 ET=21 Semi Concave 19x11 ET=24 Deep Concave

02-27-2015, 07:44 PM	#5 (permalink)
cv129 A True Z Fanatic Join Date: Jul 2011 Location: Dallas, TX Posts: 3,191 Drives: 09 Nismo, 16 Nismo Rep Power: 159827	I think static weight of the car is not as important as the weight + additional load the tires have to endure when you hit a pot hole/curb/bump. On a scale, my left front weights 972lbs, so around 945lbs without the tire itself. But rest assure, there's a lot more force acting on the tires when you run over obstacles, or during heavy braking, or cornering, or all at the same time. I'm sure the oem load rating requirement has safety margin built-in. How much of that can you safely forgo? I don't know. __________________ Setrab \| RE-71 \| SPL \| JRZ \| Nismo \| ARK \| Whiteline \| RacingBrake \| CJM Oil Pan \| Ti shield

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02-26-2015, 07:23 PM	#2 (permalink)
Brendan Track Member Join Date: Apr 2013 Location: Colorado Posts: 626 Drives: Poor man's Porsche Rep Power: 541	I think you'll be fine. http://www.tirerack.com/tires/tirete....jsp?techid=35 The tires will be able to carry a max load of 5,996 lbs.

02-26-2015, 09:52 PM	#4 (permalink)
Brendan Track Member Join Date: Apr 2013 Location: Colorado Posts: 626 Drives: Poor man's Porsche Rep Power: 541	That seems odd. You never want to force a shop into doing work they don't want to do but did he show you the regulation in writing? That seems like useful information.