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Ti res and wheels
"XL" "xl" "EXTRA LOAD" or "RF"
I
I
I
on the sidewall.
Rim
means a metal support for a tire
or a tire and tube assembly upon
which the tire beads are seated.
Rim diameter
means nominal diameter of the
bead seat
.
If you change your
wheel size, you will have to pur-
chase new tires to match the new
rim diameter
.
Rim size designation
means rim diameter and width.
Rim width
means nominal distance between
rim flanges.
Sidewall
means that portion of a tire be-
tween the tread and bead
.
Speed rating (letter code)
means the speed at which a tire is
designed to be driven for extend
-
ed periods of time. The ratings
range from 93 mph (150 km/h)
to 186 mph (298 km/h)
c::>
table
on page 254.
You may not find
this information on all tires be
-
cause it is not required by law.
25
8
The speed rating letter code,
where applicable, is molded on
the tire sidewall and indicates the
maximum permissible road
speeds
c::>
.&.
in Winter tires on
page 269
.
Tire pressure monitoring
system*
means a system that detects
when one or mo re of a vehicle's
tires are underinflated
and illum i-
nat
es a low tire pressure warning
telltale
.
Tread
means that portion of a tire that
comes into contact with the road
.
Tread separation
means pulling away of the tread
from the t ire carcass
.
Treadwear indicators (TWI)
means the projections within
t
he
principal grooves designed to give
a visua
l
indication of the degrees
of wear of the tread. See
c::>
page 262, Treadwear indicator
for mo re information on measur-
ing tire wear.
.,.
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