The rough country one is about 150.00 as well. It just gonna mess with my OCDI wouldn’t worry about it. I have only seen a couple people calibrate it and that was going up to 35” tires. It’s not enough to warrant the cost to calibrate. It’s a 2mph difference at 60mph. Do the speed limit you’ll get there 2 min earlier.
If it’s an issue for you, fix it. It didn’t bother me and I had 285/75/16’sThe rough country one is about 150.00 as well. It just gonna mess with my OCD