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I am going to buy the Johnson 1.5" lift Rods with the BF Goodrich KO2s (thank you GMFAIN for inadvertantly talking me into it!)... Is there any way to reprogram my speedometer for the new size? I know the math but really do not want to think about my speed every time I'm driving. I have searched through other threads and do not see a definitive answer. Thank you... kj
Speed difference is only about 1 mph faster than indicated at 30 mph, 2 mph faster than indicated at 60 mph.
255/55/20 is 280.5 mm plus 20 inches = 11.04 inches plus 20 inches = 31.04 inch diameter.
275/55/20 is 302.5 mm plus 20 inches = 11.91 inches plus 20 inches = 31.91 inch diameter.
31.91 divided by 31.04 = 1.028 = an increase of only 2.8 percent.
Varies a little by tire manufacturer.
Time to get trail ready for summer.
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D5 with 1.5 inch Johnson Rod lift 285-45-22 Renegade AT tires
They are posted on the forum if you search for them.
Super easy to install. Easiest if you remove one wheel at a time. You'll see the factory rods. Spray some lubricant on each end and pop them off their mounts with a small wedge tool (I used a golf divot repair tool). Pop the new on on in it's place. Reinstall the wheel. Repeat.