Porsche Carrera 911 997 owners manual page 238

text version of content this owner's manual page from owners manual to the vehicle Porsche Carrera 911, year of production 2004 - 2011:

and a half (1-1/2) times as well on the government tire failure.f Cold tire inflation pressure means: all tires course as a tire graded 100.The grade C corresponds to a level of perform-must be cold, ambient temperature maximum The relative performance of tires depends upon ance which all passenger car tires must meet un-(68 °F/20 °C) , when adjusting the inflation the actual conditions of their use, however, and der the Federal Motor Vehicle Safety Standard No. pressure. may depart significantly fr om the norm due to var-109.Avoid sunlight striking the tires before measur- iations in driving habits, service practices and dif- Grades B and A represent higher levels of per-ing cold pressures, since the pressures would ferences in road characteristics and climate. formance on the laboratory test wheel than the rise from temperature influence. minimum required by law. f Valve caps protect the valve from dust and dirt, Traction AA, A, B, C and thus from leakage. The traction grades, from highest to lowest, are Warning!Always screw caps tightly down. AA, A, B, and C and they represent the tire’s ability The temperature grade for this tire is established Replace missing caps immediately. to stop on wet pavement as measured under con-for a tire that is properly inflated and not overload-f Use only plastic valve caps. trolled conditions on specified government test ed. surfaces of asphalt and concrete.Excessive speed, underinflation, or excessive f Do not use commercially available sealant or A tire marked C may have poor traction perform-loading, either separately or in combination, can tire inflating bottles. Only use Porsche ance. cause heat buildup and possible tire failure, result-approved tire sealant. ing in serious personal injury or death. Warning! f Please see the chapter “TIRE PRESSURES FOR The traction grade assigned to this is based on COLD TIRES (68 °F / 20 °C)” on Page 289. braking (straight-ahead) traction tests and does Tire pressures not include cornering (turned) traction, accelera- Warning! tion, hydroplaning or peak traction characteris- tics. Incorrect tire pressure causes increased tire wear and adversely affects road handling. Temperature A, B, C This could lead to tire failure, resulting in loss of control, leading to serious personal injury The temperature grades are A (the highest), B and or death. C, representing the tire’s resistance to the gener-f Always use an accurate tire pressure gage ation of heat and its ability to dissipate heat when when checking inflation pressures. tested under controlled conditions on a specified indoor laboratory test wheel.f Do not exceed the maximum tire pressure list- Sustained high temperatures can cause the mate-ed on the tire sidewall. rial of the tire to degenerate and reduce tire life, Please see the chapter “TIRE PRESSURE PLA- and excessive temperature can lead to sudden TE” on Page 285. 236 Practical Tips, Emergency Service

owners manual Porsche Carrera 911

owners manual Porsche Carrera 911 - year of production: 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 - Porsche Carrera 911 997 owners manual EN