Pontiac 1957 Owner's Manual page 25

(jeneral Service
TIRES
OVER INFLATION UNDER INFLATION PROPER INFLATION
Fabric Breaks-Bruises Blowouts-Loosens Cords More Mileage-Even Wear
Poor Traction-Hard Ride Uneven Wear-Runs Hot Good Traction-Good Ride
GET MAXIMUM SERVICE FROM TIRES
BY KEEPING THEM PROPERLY INFLATED
City Preaeure
Highway Preaaure
TIRE SIZE Starting Pressure
(aft er driving car (after driving car
(after car has been three miles or more three miles or more
standing for three hours) below 40 MPH)
above 40 MPH)
7.50
X
14-4 ply S.M. Tran •.
221bs. 25 lb • • 27 lb •.
7.50
X
14-4 ply H.M. Trans.
Front
24 lb • • 271bs. 29Ib • .
Rear 221b.s 251bs. 27Ib • .
8.00 x 14-4-ply (Except Air
Conditioned Car.) 221bs. 25 lb •. 271bs.
8.00 x 14-4 ply (Air
Conditioned Cars)
Front 241bs. 27 lb •. 29 lb • •
Rear 221bs. 251bs. 271bs.
8.50 x 14-4 ply (Except
Safari & Air Conditioned Cars) 20 lb •.
231bs. 25 lb • .
8.50 x 14-4 ply
(Star Chief Safari)
22 lb •. 251bs.
271bs.
8.50 x 14-4 ply (Chieftain and
Super Chief Safari)
24 lb • . 27 lb •.
291bs.
8.50 x 14-4 ply
(Air Conditioned Cars)
Front
22 lb •• 25Ib •.
27Ib •.
Rear
20 lb •• 231bs.
25 lb •.
You can get the most from your tires by keeping them inflated to the
recommended pressures when cold . Under-inflation or over-inflation
reduces tire life and safety; over-inflation also reduces comfort. How-
ever, do not bleed air from tires when they are warm or hot even
though the gauge reading is higher than the
recommendatio~,
si,nce
this could lead to under-inflation when they become cool.
[22)