I swapped to larger 245/70/17 tires, and I’m trying to figure out the correct PSI. A calculator suggests dropping to 27 PSI instead of the OEM 35 PSI. That feels really low to me. Does anyone know if that’s right? I don’t want to mess up the contact patch.
There are too many factors to give a one-size-fits-all answer. Try contacting the tire maker and let them know your vehicle’s weight, including any added or removed cargo.
You should just stick with the pressures listed on your car’s sticker. Even with aftermarket tires, the difference usually isn’t big enough to require changing it. That’s what I do, at least.
Can we see more pictures of your Maverick? Share some details about your setup too!
I’ve used this online tool whenever I’ve changed tire sizes: Tire Pressure Calculator. It’s been pretty accurate for me.
I’d probably keep it closer to 30 PSI, but I’m curious what others think.
I run 35 PSI on my 245/45R20 tires, and it works fine for me.
I’ve got mine at about 32 PSI on 245/65/17s. That just feels right for my truck.
I run 30-32 PSI on my 245/70/17s (AT4W). I like 30 PSI better, but the low-pressure warning goes off if it drops to 29 or below.
How do you like the Mabett light bar? Can we get more pics of your truck?
The right PSI depends on the tire and the weight of your setup. Try a chalk test to figure it out:
- Draw a thick chalk line across the tread of each tire.
- Drive straight for a few tire rotations.
- Check the chalk wear.
If the chalk wears off in the center, lower the pressure. If it wears off the edges, increase it. When the wear is even, you’ve found the right PSI. Start around 30 PSI and adjust as needed.
Where’d you get your brush guard? I’ve been hunting for a decent one but can’t find anything that looks good.
Elliot said:
Where’d you get your brush guard? I’ve been hunting for a decent one but can’t find anything that looks good.
It’s the Steelcraft 50-1460c. I had to get a mechanic shop to order and install it. Buying it on your own is a hassle—I tried. Trick Trucks helped me out.
I switched to wider tires and bigger wheels on my Mustang. The stock PSI made the car handle terribly. I used a calculator, dropped it by 5 PSI, and it drove way better. 8 PSI seems like a big change, though. Just sharing my experience.