Different/Larger tires

[User_136180]

I’m new to these types of forums so please bear with me .
I have a 2019 Ram quad cab, 5th gen. off road edition. My question, can I increase the stock tire size (LT275/65 r18) without any modifications like a lift?
Thanks in advance.

 

[Curlymurt]

You can. I went from 275/65 to 275/70 and will do it again.

I don't want more width on the tire than stock which is 275. Your aspect ratio (width to height) is the 65, so if you increase it to 70 you'll have a larger circumference tire. Just going up one size doesn't need a lift.

Keep in mind, the truck is programmed for your stock tire size so when you upsize, your speedo and mileage will be off. You can buy a product to change tire size yourself or have it programmed at the dealer. Multiple options to buy like Alpha OBD or Tazer DT. I'm sure there's others out there now-a-days. Quick forum search will help.

 

[Scram1500]

I went up from 65 to 70 as well without a lift, Michelin Defender 275/70 r18.

33.2" x 11" no rubbing at all, in fact there's room to spare. I drove around for a month or so without recalibration, the only thing noteworthy was the dash calculated mpg was incorrect and the speedometer read 70 when actual speed was 73ish.

 

[Bt10]

I went up from 65 to 70 as well without a lift, Michelin Defender 275/70 r18.

33.2" x 11" no rubbing at all, in fact there's room to spare. I drove around for a month or so without recalibration, the only thing noteworthy was the dash calculated mpg was incorrect and the speedometer read 70 when actual speed was 73ish.

Identical for me, but I didn't change my speedo. It's 2 mph off on mine. Of note, I have the narrower steel wheels, so 275 really is max. I will go with 20" takeoffs next with 275/60/20, which is one size bigger than factory 20".

 

[User_136180]

Thanks so much for all the great advice.
I read that someone went with 285/75r18 with no suspension modifications or wheel change. Does that seem possible, any thoughts?
Thanks

 

[MikeyHo808]

I’m running 285/55/22’s, which is about .5 inches shorter than the 285/75/18’s with a level and I had to trim the inside of my front mud flaps. The 285/75/18 is a very tall tire. The width will clear the UCA’s, but without a level, it may be a tight fit, even with the ORP.

Below is a link to the best website to compare tire sizes. Good luck!

Tire Size Comparison

Tire size comparison the easy way. Use our tire size comparison calculator to compare diameter, width, sidewall, circumference and revolutions per mile.

tiresize.com