Alfa Romeo Tonale Owner's Handbook Manual page 252

CORRECT READING OF THE RIM CODE
Example fig. 240: 7J x 17 H2 ET 37
7 width of the rim in inches (1).
J rim drop centre outline (side projection
where the tyre bead rests) (2).
17 fitting diameter in inches
(corresponds to the diameter of the tyre
to be fitted) ((3) = Ø).
H2 shape and number of "humps"
(circumference measurement which
keeps the bead of tubeless tyres in
position on the rim).
ET 37: wheel compensation (distance
between the disc/rim supporting plane
and the wheel rim centre line).
RIM PROTECTOR TYRES
241
250
WARNING
218) If winter tyres with a lower speed
rating than that indicated in the
Registration Document are used, do not
exceed the maximum speed corresponding
to the speed rating of the tyres used.
219) DO NOT fit wheel hub caps when using
integral hub caps fixed (with springs) to the
steel rim and after sale tyres provided with
Rim Protector. Use of unsuitable tyres and
wheel caps may cause sudden decrease of
tyre pressure.
J0A0010