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Car Forum / Driving, Maintenance, Tuning / 4x4 Cars / January 2004proper tire inflation?
well i finally got the Michelin Cross Terrain 255/60/17 to replace the stock Michelin LTX M/S 245/65/17 ... first impression is: they are great! i feel like i got a pretty good deal on them at Tire Rack ($120 delivered) and the dealer did the mount and install for $54.16 for all 4 tires ... i could not believe that the dealer actually had the best deal on install ... on the way home i checked the tire pressure and it ranged in the upper 30's PSI in all 4 tires (not cold) ... has the dealer over-inflated the tires? what is a good way of figuring out the approproriate inflation pressure for this size tire on an infiniti QX4? > well i finally got the Michelin Cross Terrain 255/60/17 to replace the stock > Michelin LTX M/S 245/65/17 ... first impression is: they are great! [quoted text clipped - 8 lines] > what is a good way of figuring out the approproriate inflation pressure for > this size tire on an infiniti QX4? You are not all that different a size tire than stock, so the factory pressures listed in the Owner's Manual would be a good place to start. Here are some ideas you might try if you want to experiment a little from there: http://www.4crawler.com/Diesel/Tires.shtml#ProperInflation  SignatureRoger i did the math according to this link and the pressure comes out to be about 20 psi for the load that i have ... can i seriously run the pressure that low? > > well i finally got the Michelin Cross Terrain 255/60/17 to replace the stock > > Michelin LTX M/S 245/65/17 ... first impression is: they are great! [quoted text clipped - 10 lines] > > You are not all that different a size tire than stock, so the factory pressures listed in the Owner's Manual would be a good place to start. Here are some ideas you might try if you want to experiment a little from there: > http://www.4crawler.com/Diesel/Tires.shtml#ProperInflation > > -- > Roger > i did the math according to this link and the pressure comes out to be about > 20 psi for the load that i have ... can i seriously run the pressure that > low? You'll likely not come up with one answer or one pressure. I've run 20-22 psi in my 33x10.50 BFGs on the highway and they do OK, no signs of overheating. But for extended high speed driving, I generally run about 30 psi or higher. Start out with the suggested inflation specs for the vehilce, often in an Owner's manual, sticker on the door jamb or glove box, etc. If that feels too soft, increase the pressure, if too firm, decrease it. Watch the tread wear and tread contact patch and come up with something that works for you, your driving style, your vehicle and tires. SignatureRoger > > i did the math according to this link and the pressure comes out to be about > > 20 psi for the load that i have ... can i seriously run the pressure that > > low? > > You'll likely not come up with one answer or one pressure. I've run 20-22 psi in my 33x10.50 BFGs on the highway and they do OK, no signs of overheating. But for extended high speed driving, I generally run about 30 psi or higher. Start out with the > suggested inflation specs for the vehilce, often in an Owner's manual, sticker on the door jamb or glove box, etc. If that feels too soft, increase the pressure, if too firm, decrease it. Watch the tread wear and tread contact patch and come up with > something that works for you, your driving style, your vehicle and tires. > > -- > Roger i contacted Tire Rack where i bought the tires and they recommended 32-35 psi, the glove box sticker suggests 26 psi front and rear ... what a discrepancy > > > i did the math according to this link and the pressure comes out to be > about [quoted text clipped - 14 lines] > > -- > > Roger 26 psi???? What are you driving one of those fords that put too low a pressure sticker on them so the tires explode and flip the vehicles? There is a recall for that sticker if that is the case. That does seem low though. That said, I run 28 psi in my Jeep CJ7 with 33" tires and 32 psi in my Cherokee with p235x15 tires. I check mine using the 'chalk method'. I set the psi then run some chalk across the tread and drive in a straight line. I then see how much chalk is worn away. At 28 psi, I have about 1/4" of chalk left on the outside edges of the tread. When the tire shop installed my tires and put 36 in them I only wore out 3" of the center of the tread. Not a nice 'footprint'. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's > i contacted Tire Rack where i bought the tires and they recommended 32-35 > psi, the glove box sticker suggests 26 psi front and rear ... what a [quoted text clipped - 21 lines] > > > -- > > > Roger its an Infiniti QX4 2001 ... when you use the chalk method ... do you run the chalk right across the entire width of the tire? then when you roll the car forward do you examine the chalk foot print on the ground or on the tire? > 26 psi???? > [quoted text clipped - 43 lines] > > > > -- > > > > Roger The new tires are not far from stock. Start at the recommended 26 f/r, then go up 2lbs all around to see if that helps or hurts, etc. Don't listen to Tire Rack, they did not engineer the vehicle. > i contacted Tire Rack where i bought the tires and they recommended > 32-35 psi, the glove box sticker suggests 26 psi front and rear ... > what a discrepancy > > i did the math according to this link and the pressure comes out to be about > > 20 psi for the load that i have ... can i seriously run the pressure that > > low? > > You'll likely not come up with one answer or one pressure. I've run 20-22 psi in my 33x10.50 BFGs on the highway and they do OK, no signs of overheating. But for extended high speed driving, I generally run about 30 psi or higher. Start out with the > suggested inflation specs for the vehilce, often in an Owner's manual, sticker on the door jamb or glove box, etc. If that feels too soft, increase the pressure, if too firm, decrease it. Watch the tread wear and tread contact patch and come up with > something that works for you, your driving style, your vehicle and tires. > > -- > Roger offroad on sand and mud you can go down to 8 PSI on Troopers (31x10.5 R15) for a period. : well i finally got the Michelin Cross Terrain 255/60/17 to replace the stock : Michelin LTX M/S 245/65/17 ... first impression is: they are great! [quoted text clipped - 8 lines] : what is a good way of figuring out the approproriate inflation pressure for : this size tire on an infiniti QX4? Tire dealers routinely pay absolutely no attention to tire pressure. I have seen them with 35 pounds or 20 pounds in tires on the same truck. Strike a chalk mark across the tread and roll the vehicle a few feet. Observe the wear pattern on the chalk mark. Inflate or deflate accordingly. |
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