Load Index and Speed Rating

Load Index
The load index refers to the load-carrying capacity of a tire, or how much weight a tire can support. For example, if a tire has a load index of 89, it can support 1,279 pounds (from below chart) at maximum air pressure.
Load Index Load (lbs)
95 1521
96 1565

Speed Rating
A tire receives its speed rating by the U.S. Government through meeting minimum standards for reaching and sustaining a specified speed. What does that mean to you? Well, in general, a higher speed rating will result in better car handling.
Two important notes when considering speed rating:
• We do not recommend downgrading the speed rating of your tires. This may result in poor handling and unpredictable steering. However, if you want better cornering response, there is no problem installing a higher speed rated tire on your vehicle.

• Never mix and match tires with different speed ratings on your vehicle. This will cause serious problems with the handling of your vehicle.

Below is a list of speed ratings along with the corresponding speeds they represent. Remember, the speeds are test speeds, not recommended speeds.



Q- Up to 100mph
R- Up to 106mph
S- Up to 112mph
T- Up to 118mph U- Up to 124mph
H- Up to 130mph
V- Up to 149mph W- Up to 168mph
Y- Up to 186mph
Z- 149mph and over

Source: http://www.discounttire.com/dtcs/infoLoadIndex.dos

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• 謝謝 -u92178- ♀ (0 bytes) () 08/14/2010 postreply 11:09:20