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#1
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different max pressure
According to the owner's manual, my car need 195 65 15 91H.
I saw load index and max pressure and wonder whether I have wrong tires on my car. My car seems to have been tested with max pressure 44 psi and load index 91 tires. If I have max pressure 51 psi and load index 91 tires and keep the manufacturer recommended tire pressure (27 psi for normal load, 28 front 33 rear at full load), effective (not the tire's maximum at the tire's max pressure) load capacity will be smaller? The original factory installed Pirelli 195/65 15 91H: Max pressure: 44 psi Load index: 91 ContiTouringContact CH95 195/65 15 91H SL (on the MB recommended tire list for my car): Max pressure: 44 psi Load index: 91 ContiTouringContact CH95 195/65 15 91H SL BMW Max pressure: 51 psi Load index: 91 Michelin MXV4 plus 195/65-15 91H SL (currently on my car) Max pressure: 51 psi Load index: 91
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1992 300D 2.5 turbo diesel. 319 k miles. 124.128 chassis, 602.962 engine, 722.418 tranny. Last edited by ktlimq; 08-31-2004 at 08:19 AM. |
#2
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Maybe Luke from the Tire Rack can confirm, but in my experience, the max. pressure rating varies a lot from one tire design and/or manufacturer to another. It has no direct bearing on the load capacity provided the stated maximum tire pressure is greater than the maximum pressure recommended by the vehicle manufacturer.
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1991 M-B 560SEL Arctic White/Grey 99,000 Miles 1987 M-B 300SDL Ivory/Palomino 229,000 Miles (sold but never forgotten) 2006 Volvo XC70 Blue/Beige 1999 Porsche Boxster Arena Red/Savanna Beige 1986 Porsche 928S Goldweiss/Brown |
#3
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Quote:
good answer which is factually correct but, missses out on the most important part of air pressure vs. load capacity A P-Metric tires max load is achieved at 35 psi and a Euro metric tires max load is achieved at 36 psi adding more air pressure will not increase the tires load capacity but, lowering it will reduce the load carrying ablility. When increasing pressure all you are accomplishing is a lower rolling resistance, quicker steering response, stiffer ride and contact patch reduction.
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Please, call me to place orders or for more info use my name for on-line orders |
#4
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Quote:
Is this just to provide greater comfort at the lower pressure at the expense of optimum tire performance? |
#5
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According to MB owner's manual, driving normally loaded car with the tire pressure for full load is OK. It whill make the ride somewhat harder.
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1992 300D 2.5 turbo diesel. 319 k miles. 124.128 chassis, 602.962 engine, 722.418 tranny. |
#6
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Quote:
think of it this way: you have a one tonne pickup which you use to tow your polo horses/ race car/ luxury barge/ whatever. its rec air pressure is 80psi for teh rear wheels. that air pressure recommendation is considering a load for the capacity of the vehicle. its designed to tow ***** and carry loads. yours is designed to be nice quiet smooth luxury car. ergo to increase your lads you add pressure. while the truck is best served by reducing pressure if you want to increase comfort.
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'O=00=O' bmw 2002. long live the legend |
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