Rolls-Royce Silver Shadow - Wheeland Tyre Markings; Tyre-To Fit (Without High and Low Spots); Method of Determining the High Spot of a Wheel

Rolls-Royce Silver Shadow 8 Bentley T Series
Workshop Manual
Chapter R
FIG. R7 WHEELANDTYRE MARKINGS
A Whitewall tyre
B Blackwall tyre
1 'H' marking
2 Red spot marking
4.
Fit the tyre to the wheel ensuring that the red
spot on the tyre is aligned with the letter
'H'
marked on the wheel rim (see Fig. R7).
It should be noted that in addition to the red
spot, some tyres may be marked with either a green,
yellow.or white spot. These markings can be ignored
as they are merely used by the tyre manufacturer
for inspection purposes.
Tyre-To fit
(without high
and low spots)
Some wheels and tyres of early origin will not be
marked with the high and low spots and in these
cases a trial and error method of fitting should be
adopted as follows.
1.
To determine the high spot on a wheel bead
seat, rotate the wheel on a balancing machine and
mark the high spot with a piece of chalk.
2.
Each bead seat rim should be marked (see
Fig. R8), as the high spot on one bead seat rim may
vary slightly from the high spot on the other. In
this case, the mean distance between the two spots
should be taken as the
actudl high spot.
FIG. R8 METHOD OF DETERMINING
THE HIGH SPOT OF A WHEEL
1 High spot
2 Actual high spot
3 High spot