378
6-1. Specifications
Tire size
■Typical tire size information
The illustration indicates typical
tir
e size.
Tire use
(P = Passenger car, T = Tempo -
rary use)
Section width (in millimeters)
Aspect ratio
(tire height to section width)
Tire construction code
R = Radial, D = Diagonal
Wheel diameter (in inches)
Load index
(2 digits or 3 digits)
Speed symbol
(alphabet with one letter)
■ T
ire measurements
Section width
Ti r e h e i g h t
Wheel diameter
1
2
3
4
5
6
7
8
1
2
3
383
6-1. Specifications
6
Vehicle specifications
*: Table 1 Occupant loading and distribution for vehicle normal load for various
designated seating capacities
Tire related termDefinition
Intended outboard
sidewall
(a) The sidewall that contains a whitewall, bears white
lettering, or bears manufacturer, brand, and/or model
name molding that is higher or deeper than the same
molding on the other sidewall of the tire, or
(b) The outward facing sidewall of asymmetrical tire that
has a particular side that must always face outward
when mounted on a vehicle
Occupant distributionDistribution of occupants in a vehicle as specified in the
third column of Table 1* below
Recommended
inflation pressure
Cold tire inflation pressure recommended by a manufac -
turer.
RimA metal support for a tire or a tire and tube assembly
upon which the tire beads are seated
Rim diameter
(Wheel diameter)Nominal diameter of the bead seat
Rim size designationRim diameter and width
Rim type designationThe industry manufacturer’s designation for a rim by style
or code
Rim widthNominal distance between rim flanges
Vehicle maximum load on
the tireThe load on an individual tire that is determined by dis -
tributing to each axle its share of the maximum loaded
vehicle weight, and dividing by two
Vehicle normal load on the
tire
The load on an individual tire that is determined by dis-
tributing to each axle its share of curb weight, accessory
weight, and normal occupant weight (distributed in
accordance with Table 1* below), and dividing it by two
We a t h e r s i d eThe surface area of the rim not covered by the inflated
tire
Designated seating capac -
ity, Number of occupants
Vehicle normal load, Num -
ber of occupants
Occupant distribution in a
normally loaded vehicle
2 through 422 in front
5 through 1032 in front, 1 in second seat
