Reply To: Is 35 PSI OK if my tires were originally at 38 PSI? › Forums › Car Problems & Maintenance › Is 35 PSI OK if my tires were originally at 38 PSI? May 17, 2025 at 7:14 pm #1787 Terrence See how the spare is at 60? So you can use it as a pressure tank for when tyres are under inflated or have a slow leak to get you out of trouble. Just need a siphon pipe!