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| cmitch Expert Date registered: Apr 2006 Location: Ala-Tenn Vehicle(s): 2002 ML320, 2005 S430 4Matic, 2010 F150 Super Crew Posts: 3412  | ||
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| Marsden Classic MB Date registered: Apr 2006 Location: Capital City USA Vehicle(s): Mercedes-Benz  | ||
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| cmitch Expert Date registered: Apr 2006 Location: Ala-Tenn Vehicle(s): 2002 ML320, 2005 S430 4Matic, 2010 F150 Super Crew Posts: 3412 | RE: GL450 Suspension Marsden - 10/1/2007 7:08 PM
He means at or a little above rated air pressure (info supplied by MB in your owner's manual, door jambs and/or fuel filler cap)
Thanks!! | |
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| Marsden Classic MB Date registered: Apr 2006 Location: Capital City USA Vehicle(s): Mercedes-Benz | RE: GL450 Suspension Not to belabor the point unnecessarily, but I think you're near the danger zone. Because actual pressures when hot (after highway driving for instance) are roughly 3psi higher than cold. So your 42+3=45 => excess of rated max.
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| cmitch Expert Date registered: Apr 2006 Location: Ala-Tenn Vehicle(s): 2002 ML320, 2005 S430 4Matic, 2010 F150 Super Crew Posts: 3412 | RE: GL450 Suspension Marsden - 10/2/2007 1:17 AM Not to belabor the point unnecessarily, but I think you're near the danger zone. Because actual pressures when hot (after highway driving for instance) are roughly 3psi higher than cold. So your 42+3=45 => excess of rated max.
Wide tires are rated substantially lower than narrower ones. What are your tire's width? Are they regular width sedan tires or wider sport tires? As I pointed out, no tire manufacturer is going to put the actual maximum PSI on the sidewall because of liability issues. If they put 55 to 60 PSI on a tire rated for 44, what would happen if they manufactured a defective tire? They're going to lleave themselves some margin of error. | |
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| cmitch Expert Date registered: Apr 2006 Location: Ala-Tenn Vehicle(s): 2002 ML320, 2005 S430 4Matic, 2010 F150 Super Crew Posts: 3412 | ||
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| Marsden Classic MB Date registered: Apr 2006 Location: Capital City USA Vehicle(s): Mercedes-Benz | RE: GL450 Suspension cmitch - 10/2/2007 9:36 AM Marsden - 10/2/2007 1:17 AM Not to belabor the point unnecessarily, but I think you're near the danger zone. Because actual pressures when hot (after highway driving for instance) are roughly 3psi higher than cold. So your 42+3=45 => excess of rated max.
Wide tires are rated substantially lower than narrower ones. What are your tire's width? Are they regular width sedan tires or wider sport tires? As I pointed out, no tire manufacturer is going to put the actual maximum PSI on the sidewall because of liability issues. If they put 55 to 60 PSI on a tire rated for 44, what would happen if they manufactured a defective tire? They're going to lleave themselves some margin of error. Yeah I see what you're saying; I just wouldn't want to play with fire. Anyway, my tires on the CL are 235/55ZR17.
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| RE: GL450 Suspension Marsden - 10/2/2007 11:40 PM For each 10 degree drop in temperature, the tires will lose about 1 (I heard 2 on from some other sites) PSI. So the ML at the 39-40 PSI we keep it at in the summer will drop to about 30-32 PSI in the winter. If you've ever looked at a very underinflated tire, it;s also wider because a small portion of the sidewall pretty much becomes part of the contact patch now, and you don't want wider in the snow.cmitch - 10/2/2007 9:36 AM Marsden - 10/2/2007 1:17 AM Not to belabor the point unnecessarily, but I think you're near the danger zone. Because actual pressures when hot (after highway driving for instance) are roughly 3psi higher than cold. So your 42+3=45 => excess of rated max.
Wide tires are rated substantially lower than narrower ones. What are your tire's width? Are they regular width sedan tires or wider sport tires? As I pointed out, no tire manufacturer is going to put the actual maximum PSI on the sidewall because of liability issues. If they put 55 to 60 PSI on a tire rated for 44, what would happen if they manufactured a defective tire? They're going to lleave themselves some margin of error. Yeah I see what you're saying; I just wouldn't want to play with fire. Anyway, my tires on the CL are 235/55ZR17.
Edited by AsianML 10/3/2007 7:06 AM | ||
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My tire dealer always inflates my Michelins about 5 over the maximum rated pressure located on the MB tag ( I just checked them with my tire pressure gauge and the MB recommendation is 36 on back and 32 on front, I run 40 to 42 on back and 36 to 38 on front). The Pirellis and the Michelins are rated both at 44PSI maximum pressure. I've found inflating the tires to more pressure improves performance and tire wear but it stiffens the ride a bit.