Duramax Diesels Forum Truck of the Week
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Old 10-14-2017, 01:42 PM
08liftedHD 08liftedHD is offline
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Default Street tire pressure for Nitto 420s: poor wear

Hi all,

What pressure do you guys run in your Nitto 420s tires for street/DD? I have been running 42-45psi and am getting excessive center (middle of tread) wear with less wear towards outsides of tire, assuming this means I'm over-inflated....

Truck has 305/50/20s on a 20x10in rim.
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2008 Chevy LMM CCSB Z71 LTZ D/A
SDP Batmo/race covered S475 over stock. Exergy 40% over, Suncoast V 1056 Billet input/outputs. Pela Motorsports CP3 and 1/2" fuel lines. EFI by Adam Pela. Fabtech 6" dropped to 3" w/ dual dirtlogic 2.0 (GONE- now she's stock height with 3"shackles). RDL Cast-flow manifolds, Extreme up-pipes, and Y-bridge. ADII w/draw straw and return line upgrades, BT lockup box. Custom DP-back 5" exhaust. AFE 3" I/C pipes. Rareparts tie-rods. Crankitup Centerlink. Cognito Braces. Mag-Hytec Trans/Dif Pans. PPE ported rails and race valve. Suncoast Billet T-case brace. 60" Cognito traction bars. Bilstein 5100's. Nitto 420s. Dual VIAIR 480c compressors. Hornblasters Shocker XL's. Firestone bags. 20x9 Jesse James lawless 8's.

8LUG Magazine March '12
722/1423 stock bottom end (and probably a generous dyno)
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Old 10-14-2017, 03:11 PM
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Load inflation chart and some math will help a ton.
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Old 10-14-2017, 07:15 PM
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Bout 42 still get inner wear but less pressure and it has a lot of roll when cornering. I just deal with it. The way I drive I barely get 5k miles out of mine anyway.
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Old 10-14-2017, 07:49 PM
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Holy crap... I have 5k on my toyos on 12s and they look brand new. That's nc backroads curves too
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Old 10-14-2017, 08:15 PM
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Nittos are a little softer than toyos and I drive my truck like I stole it every time I get in it.
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Old 10-15-2017, 08:03 AM
08liftedHD 08liftedHD is offline
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Quote:
Originally Posted by OregonDMAX View Post
Bout 42 still get inner wear but less pressure and it has a lot of roll when cornering. I just deal with it. The way I drive I barely get 5k miles out of mine anyway.
Iím around 5-7k a set. Donít drive too crazy.

Its a pain in the ass though, I have to put truck on jack stands every time because no tire shop will put an D rated tire on a truck that needs an E load rating.
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2008 Chevy LMM CCSB Z71 LTZ D/A
SDP Batmo/race covered S475 over stock. Exergy 40% over, Suncoast V 1056 Billet input/outputs. Pela Motorsports CP3 and 1/2" fuel lines. EFI by Adam Pela. Fabtech 6" dropped to 3" w/ dual dirtlogic 2.0 (GONE- now she's stock height with 3"shackles). RDL Cast-flow manifolds, Extreme up-pipes, and Y-bridge. ADII w/draw straw and return line upgrades, BT lockup box. Custom DP-back 5" exhaust. AFE 3" I/C pipes. Rareparts tie-rods. Crankitup Centerlink. Cognito Braces. Mag-Hytec Trans/Dif Pans. PPE ported rails and race valve. Suncoast Billet T-case brace. 60" Cognito traction bars. Bilstein 5100's. Nitto 420s. Dual VIAIR 480c compressors. Hornblasters Shocker XL's. Firestone bags. 20x9 Jesse James lawless 8's.

8LUG Magazine March '12
722/1423 stock bottom end (and probably a generous dyno)
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Old 10-15-2017, 08:32 AM
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you already answered your own question though... those tires arnt designed for our trucks
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Last edited by TheBac; 10-15-2017 at 09:21 AM. Reason: link repaired
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Old 10-15-2017, 09:21 AM
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Quote:
Originally Posted by 08liftedHD View Post
Iím around 5-7k a set. Donít drive too crazy.

Its a pain in the ass though, I have to put truck on jack stands every time because no tire shop will put an D rated tire on a truck that needs an E load rating.
Yep same, I got a shop that will do it no questions asked as long I just bring in the wheels and tires.
Quote:
Originally Posted by Hambone View Post
http://www.procarcare.com/images/sha...dia/8852oc1.gi

you already answered your own question though... those tires arnt designed for our trucks
They are not E rated but have a higher load rating than alot of E rated tires. But that's not what the OP asked so why did you feel the need to muck up his thread.
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Old 10-15-2017, 09:23 AM
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Did anyone else think it hilarious that the o/p is asking about tire wear yet has a picture of his truck doing a huge burnout in his sig?

I was thinking, "Well yeah, of course they wear out faster"
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Old 10-15-2017, 09:27 AM
08liftedHD 08liftedHD is offline
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Quote:
Originally Posted by TheBac View Post
Did anyone else think it hilarious that the o/p is asking about tire wear yet has a picture of his truck doing a huge burnout in his sig?

I was thinking, "Well yeah, of course they wear out faster"


I was waiting for someone to say that!!! You win.

That was for an 8-lug HD magazine shoot. And also 35x12.50 toyo trailgrapplers.

I swear I normally donít roast them (much).
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2008 Chevy LMM CCSB Z71 LTZ D/A
SDP Batmo/race covered S475 over stock. Exergy 40% over, Suncoast V 1056 Billet input/outputs. Pela Motorsports CP3 and 1/2" fuel lines. EFI by Adam Pela. Fabtech 6" dropped to 3" w/ dual dirtlogic 2.0 (GONE- now she's stock height with 3"shackles). RDL Cast-flow manifolds, Extreme up-pipes, and Y-bridge. ADII w/draw straw and return line upgrades, BT lockup box. Custom DP-back 5" exhaust. AFE 3" I/C pipes. Rareparts tie-rods. Crankitup Centerlink. Cognito Braces. Mag-Hytec Trans/Dif Pans. PPE ported rails and race valve. Suncoast Billet T-case brace. 60" Cognito traction bars. Bilstein 5100's. Nitto 420s. Dual VIAIR 480c compressors. Hornblasters Shocker XL's. Firestone bags. 20x9 Jesse James lawless 8's.

8LUG Magazine March '12
722/1423 stock bottom end (and probably a generous dyno)
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  #11  
Old 10-15-2017, 09:27 AM
08liftedHD 08liftedHD is offline
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Quote:
Originally Posted by TheBac View Post
Did anyone else think it hilarious that the o/p is asking about tire wear yet has a picture of his truck doing a huge burnout in his sig?

I was thinking, "Well yeah, of course they wear out faster"
....and thanks for calling my burnout ďhugeĒ. Donít make me blush.
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2008 Chevy LMM CCSB Z71 LTZ D/A
SDP Batmo/race covered S475 over stock. Exergy 40% over, Suncoast V 1056 Billet input/outputs. Pela Motorsports CP3 and 1/2" fuel lines. EFI by Adam Pela. Fabtech 6" dropped to 3" w/ dual dirtlogic 2.0 (GONE- now she's stock height with 3"shackles). RDL Cast-flow manifolds, Extreme up-pipes, and Y-bridge. ADII w/draw straw and return line upgrades, BT lockup box. Custom DP-back 5" exhaust. AFE 3" I/C pipes. Rareparts tie-rods. Crankitup Centerlink. Cognito Braces. Mag-Hytec Trans/Dif Pans. PPE ported rails and race valve. Suncoast Billet T-case brace. 60" Cognito traction bars. Bilstein 5100's. Nitto 420s. Dual VIAIR 480c compressors. Hornblasters Shocker XL's. Firestone bags. 20x9 Jesse James lawless 8's.

8LUG Magazine March '12
722/1423 stock bottom end (and probably a generous dyno)
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  #12  
Old 10-15-2017, 10:09 AM
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Lmao. I gave up on street tires. Now I just find the at blocks get sheared off on a good burnout lol. I think all tires are destined for doom on these trucks haha
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Old 10-15-2017, 10:49 AM
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The math says it should be about 36 psi front and 20 rear but that is based of of a guess on what your truck weights

Tire weight rating at 50 psi = 3086. That is 61.72 lbs of weight capacity per every psi in the tire

Front 4500 lbs?

61.72 x two tires = 123.44 lbs

4500 / 123.44 = 36.45 psi

Rear 2500 lbs?

2500 / 123.44 = 20.25 psi

I use this method on my truck and it worked. Of course run the math with your trucks actual weight

It is a little soft so you may want to bump it up a little

Also you can chalk the tires and see what psi works for even wear too
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Old 10-15-2017, 11:12 AM
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Quote:
Originally Posted by 2004LB7 View Post
The math says it should be about 36 psi front and 20 rear but that is based of of a guess on what your truck weights

Tire weight rating at 50 psi = 3086. That is 61.72 lbs of weight capacity per every psi in the tire

Front 4500 lbs?

61.72 x two tires = 123.44 lbs

4500 / 123.44 = 36.45 psi

Rear 2500 lbs?

2500 / 123.44 = 20.25 psi

I use this method on my truck and it worked. Of course run the math with your trucks actual weight

It is a little soft so you may want to bump it up a little

Also you can chalk the tires and see what psi works for even wear too
If you use the calculator it doesn't work on these tires, at that psi with what year trucks weigh they will not last long at all, probably half as long as they would at 45 psi
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Old 10-15-2017, 11:41 AM
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Quote:
Originally Posted by OregonDMAX View Post
If you use the calculator it doesn't work on these tires, at that psi with what year trucks weigh they will not last long at all, probably half as long as they would at 45 psi
no calculator, just some simple math.

you are likely right that the pressure will not be right and the tires won't last long at that psi. but... it may be a good starting point for marking the tires with chalk and seeing how it rubs off and then adjusting from there

unloaded (truck & tires in sig) i run about 45 in the front and 25 in the rear. wear still slightly in the middle but not bad.
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