Page 149 - Vauxhall 20-60 H.P. (R Type) Chassis Shop Manual
P. 149
VAUXHALL 20-60 SHOP MANUAL
GROUP XVII
WHEELS AND TYRES
TYRE PRESSURES
SECTION It is imperative that the tyres are inflated to the correct pressures — as
650 given below — in order to obtain the best results. Also, when travelling at
high road speeds, tyre pressures considerably affect the stability of the car.
1
The following are the recommended pressures for 5 / 4 ” for 21” rims, medium
pressure tyres:—
Type of Body Front Wheels Rear Wheels
Saloon 38/40 lbs. per sq. in. 44/48 lbs. per sq. in.
Open and Coupé 38/40 lbs. per sq. in. 38/42 lbs. per sq. in.
If high speeds are to be indulged in, keep front tyres inflated to 45-48 lbs
per sq. in.
.
1
The recommended pressures for heavy service tyres — 31 x 5 25 — 5 / 4 ” for 21”
rims are given below. These tyres are easily distinguished from the previous
type by the medallion bearing the words ‘Heavy Service’, which is cast on the
wall of the tyre.
Type of Body Front Wheels Rear Wheels
Saloon 34/38 lbs. per sq. in. 35/39lbs. per sq. in.
Open and Coupé 34/38 lbs. per sq. in. 33/35 lbs. per sq. in.
If high speeds are to be indulged in, keep front tyres inflated to 40 lbs. per
.
sq. in. The recommended pressures for the latest type of tyres — 30 x 5 50
for 20” x 4” rims are as follows:—
Type of Body Front Wheels Rear Wheels
Saloon 30/33 lbs. per sq. in. 36/39lbs. per sq. in.
Open and Coupé 30/33 lbs. per sq. in. 31/35 lbs. per sq. in.
With all types of tyres the front tyre pressures must always be the same in
order to avoid pull in the steering.
WHEELS
SECTION Two types of wire wheel have been used. With the earlier type a distance
651 piece is fitted to the hub and located by the five wheel attaching studs,
while with the later type the distance piece is incorporated in the hub of the
wheel. It is therefore necessary in the event of changing the earlier type of
wire wheels for either the later type or artillery wheels, that the distance
pieces are removed from the hubs.
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