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4th Gen Ram Tech2009 - 2018 Rams and the 2019 Ram Classic: This section is for TECHNICAL discussions only, that involve the 2009 - 2018 Rams and the 2019 Ram Classic. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
So I went from having P265/70R17 tires on my truck and changed them out to P275/55R20's and I was wondering if I should have the speedometer recalibrated so the shift points and such are still proper?
If you have a smart phone, get you an app that reads speed and gor a drive. See if there is a difference between what it says and what your speedo says. Decide from there.
not to hijack this thread, but i presume the trucks have something to compensate for what wheels/tires the come with since the difference beween at 265/70-17 and a 275/60-20 is even bigger?
not to hijack this thread, but i presume the trucks have something to compensate for what wheels/tires the come with since the difference beween at 265/70-17 and a 275/60-20 is even bigger?
programming or a different gear somewhere?
Back in the day it was a physical geared drive in the trans. You could adjust the speedo by buying a gear-drive with more or less teeth to adjust the ratio. Now, with electrical systems, it's a simple programming step for the dealer.
don't waste your time and as soon as the tire gets a 1000 miles on it, it will be the same size as the stock tire. some tires run tall and some short so you are chasing your tail