* Based on internal wet autocross tests on a 2011 Honda Civic SI with BFGoodrich g-Force Rival + tire versus Hankook Ventus RS4 tire in tire size 245/40R17. Actual on-road results may vary.
The sizes shown are average design values for tires measured on specified measuring rim widths. Some tires may vary from this value by +/-3% of the section height (affecting overall diameter), and +/-4% of the section width.
>> Section width varies approximately 0.2" (5mm) for every 0.5" change in rim width.
>> Tread patterns are often tuned to accomodate different tire widths. Tires for a particular dimension of a given tireline may vary in appearance from the tire shown in the photograph.
XL = Extra Load
WARNING: Serious or fatal injury may result from tire failure due to underinflation or overloading. To ensure correct air pressure and vehicle load, refer to vehicle owner's manual or tire information placard on the vehicle. Serious injury or death may result from explosion of tire/rim assembly due to improper mounting. Only tire professionals should mount tires and they should never inflate beyond 40 psi to seat the beads. Before mixing types of tires in any configuration on any vehicle, be sure to check the vehicle owner's manual for its recommendations.
DANGER: Never mount a 16" diameter tire on a 16.5" rim.
DANGER: Never mount a 17" diameter tire on a 17.5" rim.
Inflation pressure increase must not exceed the maximum pressure branded on the tire sidewall. When a customer requests a replacement tire with a lower speed rating than the original equipment tire, you must clearly communicate to him or her that the handling of the vehicle may be different, and that its maximum speed capability is limited to that of the lowest speed-rated tire on the vehicle. Exceeding the lawful speed limit is neither recommended nor endorsed.
For high-speed driving, additional inflation pressure and possibly reduced tire loading and/or upsizing is required. In the absence of specific recommendations by the vehicle manufacturer, use the following guidelines based on those in the European Tyre and Rim Technical Organization Standards Manual.
For speeds over 160km/h (100 mph), load and inflation must be adjusted according to the tables below.
W-Speed Rated Sizes:
Maximum Speed (mph) 118 124 130 136 143 149 155 161 168
Inflation Increase (psi) 0 1.5 3.0 4.5 6.0 7.5 7.5 7.5 7.5
Load Capacity (% of max) 100 100 100 100 100 100 95 90 85
(Y)-Speed Rated Sizes:
Maximum Speed (mph) 118 124 130 136 143 149 155 161 168 174 180 186
Inflation Increase (psi) 0 0 0 0 1.5 3 4.5 6 7.5 7.5 7.5 7.5
Load Capacity (% of max) 100 100 100 100 100 100 100 100 100 95 90 85
For speeds above 186 mph (300 kph), consult your vehicle manufacturer and tire dealer.
Inflation pressure increase must not exceed the maximum pressure branded on the tire sidewall. Exceeding the lawful speed limit is neither recommended nor endorsed.