Golden_HVAC wrote:
LT truck tires do not suffer from derating. However they are also only rated at about 75 MPH, and if above that speed, then LT tires must be derated by 10% weight factor as well.
I had never heard of that before, so I just checked my BF Goodrich tires. According to BF Goodrich, if LT tires do not have a specific speed rating, they are rated to 87 MPH.
Looking online, I don't se a specific speed rating for mine. I guess they are "only" rated to 87. Never realized that before!
OP, if you don't have any problems with your current P rated tires I wouldn't change them. If you feel uneasy because they are squishy or you are close to your max rating, changing to LT will firm up the ride and most likely give you a higher weight rating. P tires are cheaper and offer a softer ride, which is why a lot of half ton trucks come with them.
My Tundra came with E rated tires from the factory and I love them. When its time to replace, I'll probably go with a D range because the E range is WAY overkill.
I wouldn't worry about 2 or 3 MPH faster or slower. If you change them, just remember the difference when driving.
