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Originally Posted by fourfourto
Also whoever said inflate the spare to 50psi is wrong your tire pressure doesnt go down when there is a load.
I beleve the manual says inflate spare to 50lbs.F5 Its not for load its because it wont be used for a long time(maybe over a year)And insures there wont be a flat or low tire when the spare is needed.
I have only used a spare tire once in 20 years for a blowout.I usually fix it on the spot or put air in to get home. |
I would guess that the reason the spare is inflated to 50 psi, versus 35 psi is due to the fact it is not mounted to the vehicle, and the higher pressure keeps the tire seated better on the rim. There might be some reasoning that if inflated to 50 and it does loose air over a period of time, at least it won't be flat if used. However, whenever the TP in the tires on the ground are checked, the spare should also be checked.
I would also guess that all the tires on the vehicle are inflated to 50 psi at time of shipping from the plant (H3 Builder anything on this?). To seat a tire to a rim, requires more pressure than it is normally required. Part of the pre-delivery inspection performed by the dealers is to check tire pressure and lower TP to adjust to recommended pressures. (Vehicles that left the Saturn Plant had 45 psi and were required to be adjusted down to around 28-30 by the dealer.)