Speedometer Calibration After Installing 285 45 R22 Tires?
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Junior Member
Joined: Jun 2024
Posts: 28
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Tesla Model S; Wrangler 392
Speedometer Calibration After Installing 285 45 R22 Tires?
I'm considering installing some 285 45 R22 All Terrains and I notice that these are about 1-1.5" greater in diameter than OEM. This will throw off the speedometer. Has that been an issue for anyone?
Thanks!
Thanks!
MBWorld Fanatic!
Joined: Sep 2020
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2025 G 63
I think that’s the same size as my winter tires. I don’t think you will have to recalibrate the speedometer.
MBWorld Fanatic!
Joined: Feb 2015
Posts: 1,640
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From: NC
2026 G63
If I recall I think it's like a 1-2% difference. Maybe 2 mph when going at highway speeds. I'd just let it be--the odometer will run a little slower but not really enough to make a difference.
Senior Member
Joined: Feb 2020
Posts: 278
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From: Utah and California
2024 G 63, 2015 Ferrari 458 Speciale
There's an online Speedometer Calibration Calculator
https://tiresize.com/speedometer-calibration/
I replaced my OEM tires (Pirelli 295/40 22) with Continental all weather tires (285/45 22).
The replacement tires are slightly taller (about .8 inch) than the OEM tires.
Taller tires result in the speedometer showing a higher speed. In my case, the error is about 2.5 percent
For example:
Speedo reads 60 MPH - Actual 62 MPH
Speedo reads 100 MPH - Actual 103 MPH
https://tiresize.com/speedometer-calibration/
I replaced my OEM tires (Pirelli 295/40 22) with Continental all weather tires (285/45 22).
The replacement tires are slightly taller (about .8 inch) than the OEM tires.
Taller tires result in the speedometer showing a higher speed. In my case, the error is about 2.5 percent
For example:
Speedo reads 60 MPH - Actual 62 MPH
Speedo reads 100 MPH - Actual 103 MPH
Member
Joined: May 2024
Posts: 126
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From: Beverly Hills
AMG G63 ('24); Ferrari Roma ('24); Alfa Romeo 4C ('20); AMG C63 ('10)
Be mindful of the increase in tire diameter will likely raise the height above the factory specifications for the vehicle (i.e., 77.4 inches or 6' 5.4"). This is important because the G63 is a tall vehicle to begin with. I've had way too many close calls with parking garage clearances. I'm not sure if it's a SoCal thing, but I would estimate my '24 G63 doesn't fit the maximum height clearance of at least 1/3 of the parking garages in LA.
Be safe.
Be safe.
MBWorld Fanatic!
Joined: Sep 2020
Posts: 1,118
Likes: 277
2025 G 63
Be mindful of the increase in tire diameter will likely raise the height above the factory specifications for the vehicle (i.e., 77.4 inches or 6' 5.4"). This is important because the G63 is a tall vehicle to begin with. I've had way too many close calls with parking garage clearances. I'm not sure if it's a SoCal thing, but I would estimate my '24 G63 doesn't fit the maximum height clearance of at least 1/3 of the parking garages in LA.
Be safe.
Be safe.
