SL/R231: Calibrating Speed Sensor for Increasing Tire Aspect Ratio
#1
Senior Member
Thread Starter
Calibrating Speed Sensor for Increasing Tire Aspect Ratio
Hi, the time has come for me to replace the tires on my 2014 SL550 with 255/35/R19 tires up front and 285/30/R19 tires in the rear. I would like to change the tires to 255/40/R19 and 285/35/R19 to improve ride quality. I have two questions. First of all, will anything rub or collide? second, how could I get the wheel speed sensors re-calibrated, and how much would it cost if it's possible?
Thanks for your help!
Thanks for your help!
#2
Junior Member
If sized right the wheel will be bigger but the outside diameter of the tire will stay the same and no recalibration should be necessary.
#3
By my math (possibly incorrect) you will read 67-68 at 65 with the change. You are basically gaining ~1cm of sidewall. Given that speedometers are usually conservative(read about 2-3mph fast at 65), I suspect the speedo will actually read pretty close to dead on with REAL mph. Given that, I"m not sure I would get it calibrated. But to get the correct sizing (I believe) you would have to go to a wider tire....which suspect is not your goal, which I assume is more sidewall, better ride. Why not go to a -1 wheel?
Not sure on the rubbing though.
Not sure on the rubbing though.
#4
Senior Member
Thread Starter
By my math (possibly incorrect) you will read 67-68 at 65 with the change. You are basically gaining ~1cm of sidewall. Given that speedometers are usually conservative(read about 2-3mph fast at 65), I suspect the speedo will actually read pretty close to dead on with REAL mph. Given that, I"m not sure I would get it calibrated. But to get the correct sizing (I believe) you would have to go to a wider tire....which suspect is not your goal, which I assume is more sidewall, better ride. Why not go to a -1 wheel?
Not sure on the rubbing though.
Not sure on the rubbing though.