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Tire pressure for new tires and wheels

ShawneeCash

By ShawneeCash
in Tires, Wheels & TPMS

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ShawneeCash Enthusiast

ShawneeCash

Posted
Posted

Just recently purchased 35x12.50r20 trail grapplers with 20x9 XD wheels. After installation the tire folks had almost 60 psi in all four tires. This seemed to be a lot. Felt like I was driving on marbles. After researching I have no idea what to set the pressure at... Any ideas? I don't tow or carry anything heavy.

 

 

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nadrojcote Senior Enthusiast

nadrojcote

Posted
Posted

Whats your stock tire size? These are the calculations if you put those tires on a 2014+

 

http://www.toyotires...P-LT_102913.pdf

2014-2015 p275/55r20 (stock good year sr-a) is rated at 2315lb at 32psi (recommended stock psi)

33x12.5x20 is rated at 2495 at 45psi

2310lb at 40psi

2495lbs - 2310lbs 185

-------------- = ----- = 37 lbs per 1psi increase from 45-50

45psi - 40psi 5

2315-2310 = 5lbs

correct psi to match stock tire load would be 40 psi, to be safe you could round it up to 41 psi.

AGAIN THIS IS FOR A 2014+ but its probably similar.

ShawneeCash Enthusiast

ShawneeCash

Posted
  • Author
Posted

My door says 35 psi front and rear..so would I go about 42/43?

 

 

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JCJ Enthusiast

JCJ

Posted
Posted

I'm going to order rims and tires today. What is your back space with your rims? I'm looking at +18 with 35/12.50r20 is your truck lifted if so how much?

JCJ Enthusiast

JCJ

Posted
Posted

Just recently purchased 35x12.50r20 trail grapplers with 20x9 XD wheels. After installation the tire folks had almost 60 psi in all four tires. This seemed to be a lot. Felt like I was driving on marbles. After researching I have no idea what to set the pressure at... Any ideas? I don't tow or carry anything heavy.

Sent from my iPhone

 

Are the tires loud as they say they are and also my other questions are above.

ShawneeCash Enthusiast

ShawneeCash

Posted
  • Author
Posted

I have zero back spacing. I have 7.5 inch RCX lift. No rubbing except on the mud flaps when in reverse with wheel turned all the way. Most people remove the mud flaps but I like them.

 

 

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They aren't very loud either.. Only on interstate do you hear them in the cab. Turn radio up a little and you can't hear them.

 

 

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JCJ Enthusiast

JCJ

Posted
Posted

Very nice looking truck! I have a 3.5 rc suspension and ordered a 3" body from performance I'm hoping mine looks as good as yours does for sure.

nadrojcote Senior Enthusiast

nadrojcote

Posted
Posted

Stock is 265/75/18

 

 

Sent from my iPhone

That's an odd size and its not in the load chart. When I look up your truck its telling me 265/65r18 is the stock size.

 

p265/65/r18 is rated at 2469lb at 35psi (recommended stock psi)

33x12.5x20 is rated at 2495 at 45psi

2310lb at 40psi

2495lbs - 2310lbs 185

-------------- = ----- = 37 lbs per 1psi increase from 45-50

45psi - 40psi 5

2469-2310 = 159lbs

159/37=4.3

40psi + 4.3psi = 44.3 psi

correct psi to match stock tire load would be 44 psi, to be safe you could round it up to 45 psi.

ShawneeCash Enthusiast

ShawneeCash

Posted
  • Author
Posted

Thanks. And your right on the tires size.... I didn't proofread before I sent the size. Thanks again.

 

 

Sent from my iPhone

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