Dgc333
Well-Known Member
- First Name
- Dave
- Joined
- Aug 24, 2021
- Threads
- 13
- Messages
- 1,569
- Reaction score
- 3,528
- Location
- Massachusetts
- Vehicle(s)
- 21 Ranger Lariat
- Occupation
- Engineer
Never heard of such a thing. The recommendation on the door placard is for all ambient temps.Most of your national tire chains have the difference posted right on the inflation machine. For example Discount Tires even has a sign at their drive up pressure check lane states at which ambient temps they will inflate to what pressure.
The cold pressure on the door doesn't take into account ambient temperature and is a general safe guideline but if you're trying to dial in the pressure, accounting for cold vs hot and ambient temperature is required. If I set my tires to 39 psi today while it's 95 degrees out and drive slowly around town, the rise in pressure will be less than if I get on the highway and drive for two hours. Likewise if I set it to 39 in the winter and do the same slow drive around town, it will not rise as much as today when it's 95 out.
My experience with these tires on the Tremor is that during summer temps, they will rise 10-15% in pressure in a relatively short period of time. If someone has theirs at 42 cold, it'll climb to 46-47 when at temp, which is pretty stiff riding and will begin losing some traction, especially in the wet.
My son manages a Tire & Service center and is a member of the Tire Industry Association and follows their recommendations. He will only set air pressure to the recommendation on the placard even if a customer requests something else. It is a liability thing.
I fully understand that the air pressure increases as you drive but the placard recommendation accounts for that as does the max recommended inflation pressure on the tire side wall. I can't think of one technical reason why you would want to set your tire air pressure differently based on ambient temperature. I certainly can understand why you would want to deviate from the factory compromise to improve ride with less pressure or improve mileage with more pressure but different pressures for different ambients doesn't make any sense.
I tend to run my tires a few psi less than the door placard to get a better ride. The Grabber ATx tires on my Tremor give me a good ride with no noticeable loss of mileage or degradation in handling. If I was loading the truck up I would increase the pressure to the 39 psi recommendation.
Sponsored