WHEELS AND TYRES
502
Dimension designation for wheel rim
Wheel and rim dimensions are designated in accordance with the examples in the tablebelow.
All wheel rims have a dimension designation, for example: 8.5Jx19x47.5.
8.5 Rim width in inches
J Rim flange profile
19 Rim diameter in inches
47,5 Off-set in mm (distance from wheel centre to wheel contact surface against the hub)
The car has an approval for the complete vehicle with certain combinations of wheel rims andtyres.
Related information
•Tyres (p. 482)
• Dimension designation for tyre (p. 502)
Dimension designation for tyre
Designations for tyre dimension, load index and speed rating.
The car has an approval for the complete vehicle with certain combinations of wheel rims andtyres.
Designation of dimensionsAll tyres have a dimension designation, such as:255/40 R19 100 W.
255 Tyre width (mm)
40 Ratio between tyre wall height and tyre width (%)
R Radial ply
19 Rim diameter in inches
100 Codes for the maximum permitted tyre load, tyre load index (LI)
W Speed rating for maximum permitted speed, speed rating (SS). (In this case 270 km/h (168 mph).)
Load indexEach tyre has a certain capacity to carry a load, a load index (LI). The car's weight determines theload capacity required of the tyres. The lowestpermitted load index is specified in a load indextable.
Speed ratingEach tyre can withstand a certain maximumspeed. Tyre speed rating, SS (Speed Symbol),must at least correspond with the car's topspeed. The table below shows the maximum per-mitted speed for each speed rating (SS). Theonly exception to these regulations is winter tyres3
, where a lower speed rating may be used.
If such a tyre is chosen, the car must not be driven faster than the speed rating of the tyre (forexample, class Q can be driven at a maximum of160 km/h (100 mph).) The top speed at whichthe car can be driven depends on road condi-tions, not the speed rating of the tyres.
NOTE
The maximum permitted speed is specified in the table.
Q 160 km/h (100 mph) (used only on win- ter tyres)
T 190 km/h (118 mph)
H 210 km/h (130 mph) V 240 km/h (149 mph)
W 270 km/h (168 mph) Y 300 km/h (186 mph)
3 Both those with metal studs and those without.
SPECIFICATIONS
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561
DimensionsMeasurement of car length, height, etc. can be read in the table.
Dimensions mm
A Wheelbase 2941
B Length 4936 C Load length, floor, folded seat 1988
D Load length, floor 1153 E Height 1475F Load height 704Dimensions mm
G Front track 1628A
1618 B
1617 C
1623 DDimensions
mm
H Rear track 1629A
1619 B
1618 C
1624 D
I Load width, floor 1130
J Width 1879E
1890 F
