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Cooper Discoverer A/T 3

I run 75 psi when towing and I run 58 psi when unloaded around town. Anything more than that knocks my fillings in my teeth loose.
Maybe your roads are different, but when I run 80 psi all the way around, and hit a small bump or pothole, it sounds like the front end is falling out. I personally get a much better, quieter ride when I run 58 psi. I have experimented extensively.
 
tanman_2006 said:
On my srw I agree with lower psi.

I just rotated on my dually at 9k miles, the fronts have an almost full contact pattern when aired to 80 and put on the rear. 235/80 17's
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Tanner, how low on the SRW? I'm curious if anyone else runs lower than 55 psi, I'd never run across that before. I won't run lower, but curious anyway.
 
On my 95 K1500 I ran low 40's out back and 50ish front on 265/75 16's

On my 06 LBZ w/ 305/55 20's E rating 65psi max rating I would run as low as 50psi on Cooper AT3'S up front and St Maxx in the rears both 3ply sidewall tires.
 
tanman_2006 said:
On my 95 K1500 I ran low 40's out back and 50ish front on 265/75 16's

On my 06 LBZ w/ 305/55 20's E rating 65psi max rating I would run as low as 50psi on Cooper AT3'S up front and St Maxx in the rears both 3ply sidewall tires.
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The light duty (7.2k GVWR) K2500 Burb placard shows 40 psi front & 50 psi back, the K2500 (8.6k+) placard shows 55 front & 80 rear.

I've run 40 psi on these 295/75/16 e TOYO's and it gets soft cushy ride w/o over heating sidewalls.
 
New tires! Replaced the worn out 245's with 265/75-16's.

151119%252520GMC%252520EC%252520New%252520Tires%252520%2525231.jpg


151119%252520GMC%252520EC%252520New%252520Tires%252520%2525232.jpg
 
FellowTraveler said:
Look good, calibrate the VSSB & ABS controller, or?
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No, I don't plan to. It's only about a 4% difference in circumference. My truck since I've had it has a speedo error issue anyway, though when I read speed through the OBDII it reads out correctly so I think my odometer has been accurate. The speedo has read about 22% higher than actual speed, so when I'm going 60 the speedo reads 73 or so. Not sure what is going on with that but I've just lived with it.
 
I don't have a tuner. I did check some time ago with GPS, then got one of those bluetooth OBDII plugs so I could see speed on my phone. The OBDII speed reading matches the GPS speed, while the speedo reads much higher.
 
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