315
Section width 		30
Aspect ratio 		Z
Speed Category 		R
Construction 		18
Rim diameter 		91
Load index 		W
Speed Rating 		LL
Load range 		TL
TL/TT
Specs Code/Value Description
Section width Section width
 315 (mm) 		The distance between the outside of a tire sidewalls, not including any lettering or designs.
Aspect ratio Aspect ratio
 30 (%) 		The aspect ratio determines the height of the sidewall and is a percentage of the section width.
Speed Category Speed Category
 Z 		The tire's speed capability:
VR - up to 210 km/h,
ZR - up to 240 km/h.
Construction Construction
 R (Radial) 		Radial construction tire.
Rim diameter Rim diameter
 18 (") 		Diameter of rim seat supporting the tire bead.
Load index Load index
 91 (615kg/1355lbs) 		Maximum load each tire is designed to carry when inflated to the recommended pressure.
Speed Rating Speed Rating
 W (270km/h/168mph) 		Maximum speed at which a tire can roll with the load indicated in its load index.
Load range Load range
 LL (4 ply) 		Maximum load capacity the tire is engineered to handle at certain inflation pressures. It also define the tire toughness and the strength of the sidewall.
TL/TT TL/TT
 TL (Tubeless) 		Tire specifically designed for fitting to appropriate wheel rims without an inner tube.
Manufacturer part number Manufacturer part number
 86742 		Alpha-numeric designation assigned by a manufacturer to uniquely identify a tire product.