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Whee
l
s
"XL" "xl" "EXTRA LOAD" or "RF"
I
I
I
on the s idewal
l.
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 sea
t
.
If you change yo ur
wheel size
,
you w ill have to pur-
chase new tires to match the new
rim diameter
.
Rim size designation
means rim diameter and width.
Rim width
means nomina
l
distance between
rim flanges
.
Sidewall
means that port ion
of
a t ire 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 t ime. The rat ings
range from 93 mph (150 km/h)
to 186 mph (298 km/h)
¢
table
on page 210
.
You may not find
this information on all tires be-
cause it is not required by
law
.
2
14
The speed rating letter code
,
where applicable
,
is mo lded on
the tire sidewall and indicates the
maximum permiss ible road
speeds
¢
.&.
i n Winter tires on
page 224.
Tire pressure monitoring
system*
means a system that detects
when one or mo re of a ve hicle's
tires are under inflated and illumi
-
na
t
es a low tire pressu re warning
tellta le
.
Tread
means that portion of a tire that
comes into contact with the road.
Tread separation
means pu lling away of the tread
from the t ire carcass.
Treadwear indicators (TWI)
means the projections
wit
hin the
principal grooves designed to give
a visua
l
indication of the deg rees
of wear of the tread
.
See
¢
page 218
,
Treadwear indicator
for mo re information on measur-
ing t ire wear.
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