ubonrthai Posted December 20, 2012 Share Posted December 20, 2012 (edited) How much air would you recommend putting in 265/65r17 tires on a 4 door 4x4 Vigo with a cab on the back? Max pressure says 44psi on the tire. The manual recommends 28 for both front and rear if the tires are 255/70/15 which they are not. The tire shop that put them on suggested 40. Who do I believe? Edited December 20, 2012 by ubonrthai Link to comment Share on other sites More sharing options...
jcgodber Posted December 20, 2012 Share Posted December 20, 2012 35 lbs front and rear while still cold Link to comment Share on other sites More sharing options...
IMHO Posted December 20, 2012 Share Posted December 20, 2012 (edited) If the wheels/tires are OEM, look at the placard in the driver's door jamb - that should be model specific. If the 17" wheels/tires have been fitted aftermarket, you will need to compare old:new tire load ratings (which are a v.good indicator of sidewall stiffness) to determine the pressure needed. Rule of thumb here is: OEM tire load rating - new tire load rating + manufacturers recommended PSI example: OEM tires are 255/70R15 111H, new tires are 265/65R17 113V, and the manufacturer's recommendation is 28 PSI: 111-113+28 = 26 PSI Edited December 20, 2012 by IMHO Link to comment Share on other sites More sharing options...
transam Posted December 20, 2012 Share Posted December 20, 2012 (edited) If you have anywhere near 40 psi in your tyres on a Vigo your head will be bouncing on the ceiling and you will not have 100% traction in different maneuvers and they will wear out a lot quicker. The max rating on the tyre is for safety purposes for a particular use, My Vigo it states 29 psi, loaded or unloaded. The 29 psi is a ''cold'' pressure as pressure will increase when the tyres warm up in use. Edited December 20, 2012 by transam 1 Link to comment Share on other sites More sharing options...
EvilDrSomkid Posted December 21, 2012 Share Posted December 21, 2012 265/65s? On 17" rim? I'd go for 34. I run 36 on my 245/40/17s. Link to comment Share on other sites More sharing options...
Hssl Posted December 21, 2012 Share Posted December 21, 2012 33 would be where I would start. Now finding a machine with a gauge that works correctly is another matter. Better to buy a hand held gauge. You can pretty much guarantee if the Thai shops that sold them says 40 it should be less! Link to comment Share on other sites More sharing options...
ubonrthai Posted December 22, 2012 Author Share Posted December 22, 2012 Now finding a machine with a gauge that works correctly is another matter. Better to buy a hand held gauge. I bought a small air compressor with a gauge on it that plugs into a lighter from Thai Watsadu. Works like a charm. Link to comment Share on other sites More sharing options...
BSJ Posted December 22, 2012 Share Posted December 22, 2012 I have an attachment: a pistol grip with gauge, flexi hose and a chuck I fitted myself. It always reads 3psi less than the hand held gauge. It's a joy being able to check the pressure in the rear tyre of the big bike now. Link to comment Share on other sites More sharing options...
Kwasaki Posted December 23, 2012 Share Posted December 23, 2012 If the wheels/tires are OEM, look at the placard in the driver's door jamb - that should be model specific. If the 17" wheels/tires have been fitted aftermarket, you will need to compare old:new tire load ratings (which are a v.good indicator of sidewall stiffness) to determine the pressure needed. Rule of thumb here is: OEM tire load rating - new tire load rating + manufacturers recommended PSI example: OEM tires are 255/70R15 111H, new tires are 265/65R17 113V, and the manufacturer's recommendation is 28 PSI: 111-113+28 = 26 PSI Good post correct info if your changing to different profile tyres :- The correct rule is: Adjust the OEM recommended PSI pressures by subtracting or adding the load rating of the new tyre from the load rating of OEM new tyre. Examples: If the OEM tyre is 109S and the new tyre is 112V, and the OEM pressure is 29PSI: 109 minus 112 = minus 3 29PSI minus 3 = 26 PSI If the OEM tire is 112H and the new tyre is 111R, and the OEM pressure is 32PSI: 112 minus 111 = +1 32PSI + 1 = 33 PSI. So obviously important to know what the OEM load of your vehicles OEM tyre. Link to comment Share on other sites More sharing options...
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