Road PSI...?

Post by **EricB** » Mon Sep 27, 2004 9:36 pm

Hi

I was wondering what PSI you guys use on the road?

I have 32x11.5x15 MTRs and was told to run them at 36psi by the tyre guys.

I have tried 33psi and 30psi also.

How low would you have to go to cause wearing on the outside tread?

I think 30psi feels a little on the spongy side.

Post by **glen1n** » Mon Sep 27, 2004 9:45 pm

i use 30 all round on road, with 31's

Post by **bru21** » Mon Sep 27, 2004 9:50 pm

i run 35 x 12.5 x 15 on the road. drove badly with more than 22 in the front and 18 in the rear of my gq ute. estimate the surface area and compare that to standard and inflate accordingly as a rough guide.

eg you car weighs x and has x load on front and x load at back if your tyres are 15 % bigger foot print put in 15% less air.

use that as a starting point and keep checking them.

at a guess i recon 28 - 32

cheers bru

Post by **built4thrashing** » Mon Sep 27, 2004 10:03 pm

heres a tip. go buy a cheap CD player and install it. then drive any backstreet in the city and the best pressure the tyres should be is when the CD wont jump. well this is what i have to do.

at 25psi only the potholes will cause it to jump :rofl:

Post by **Big Red Toy** » Mon Sep 27, 2004 10:05 pm

i run 50psi on the road and start at 15psi off road.
Stops the edge lugs wearing down

Post by **EricB** » Mon Sep 27, 2004 10:11 pm

50psi wow

Post by **glen1n** » Mon Sep 27, 2004 10:58 pm

i aint ever gonna help you air down

Post by **MY45** » Mon Sep 27, 2004 11:21 pm

Big Red Toy wrote:i run 50psi on the road and start at 15psi off road.
Stops the edge lugs wearing down

Why would you want only the inside to wear ? Dont you want it wear evenly?

Post by **dumbdunce** » Tue Sep 28, 2004 10:04 am

MY45 wrote:
Big Red Toy wrote:i run 50psi on the road and start at 15psi off road.
Stops the edge lugs wearing down

Why would you want only the inside to wear ? Dont you want it wear evenly?

offroad, with low pressures, the edge lugs can wear very quickly especially on rocks. running high pressures on the road evens the wear out by transferring the weight primarily to the inner blocks. I always ran the tyres on the bundy at 45psi on the road and they still always wore out on the edge lugs from rock damage. I was trying the same theory on the 80 but I didn't get enough km on it to know whether it worked or not

Post by **Shorty40** » Tue Sep 28, 2004 10:12 am

Swampers tend to 'crown' a bit at street pressures and ride on the centre lugs, so it kind of evens out with off road pressures wearing out the outer lugs :cool:

Post by **Utemad** » Tue Sep 28, 2004 11:40 am

I use 38f/36r in my Rodeo with 225/75 16, less with my 31s.

We put 50f/50r in the F250s for lightly loaded road work with 265/75 16.

Post by **bj42turbo** » Tue Sep 28, 2004 5:45 pm

Big Red Toy wrote:i run 50psi on the road and start at 15psi off road.
Stops the edge lugs wearing down

Me too 50 psi on road, maybe I will run less if I ever get power steering

Post by **Big Red Toy** » Tue Sep 28, 2004 7:57 pm

glen1n wrote:i aint ever gonna help you air down

takes about 20secs a tyre, pull out valve core, wait for it to change note as the air pisses out which is about 20 psi, give the tyre a kick, if it wobbles enough put the valve core back in, its that simple

Post by **chimpboy** » Tue Sep 28, 2004 8:07 pm

yeah high, high... higher tyre pressure is good for a heavy vehicle and good tyre life. As high as you can go and still find the ride okay basically.

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Road PSI...?

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