I would think that a tire with a Max PSI of 44 would have a different “factory recommended” pressure than a tire with a Max PSI of 51. If a tire has a 20% higher max PSI, I’d think that it’s recommended PSI would be 20% higher.
But I recently had this conversation with a tire shop.
“What’s the best pressure to keep these tires at?”
“Well, your door says 35, so we’re adjusting your tires to 35”
“But these tires didn’t come with this car. This car came from the factory with 16” normal tires. These are 17" low profile performance tires. Shouldn’t that make a difference? These tires did not come stock on this model"
“Yeah, but the do come stock on the BOSS and some GTs”
“Well wouldn’t those cars say something different on the door?”
“We always go by what the door says”
Are they right? I realize they’re the experts here. But I no longer believe any claim a person makes unless there’s a consensus to the truth on the SDMB.
So, what’s the truth?