GLS 580 Axle ratios vs tire heights
Thread Starter
Super Member
Joined: Dec 2013
Posts: 630
Likes: 177
From: SW Ontario Canada
2020 GLS580, 2023 Corvette Z06
GLS 580 Axle ratios vs tire heights
Does anyone know where I can find the axle ratios for the GLS 580 models. There must be several because the tire heights on various GLS models are significantly different and vary by as much as 38mm or 1.5 inches.
If there is only one how do they correct the speedo for the different tire heights? I have not been able to get this from Mercedes.
If there is only one how do they correct the speedo for the different tire heights? I have not been able to get this from Mercedes.
Thread Starter
Super Member
Joined: Dec 2013
Posts: 630
Likes: 177
From: SW Ontario Canada
2020 GLS580, 2023 Corvette Z06
The final gear ratio (Axle) on the 450 and 580 are 3.27 diesels are 3.46, according to what I have found. I don't know if they are different for the AMG models. There is a large height variance on the optional tire sizes for the GLS so I am still trying to find out how or if that is addressed to make the speedometer accurate. GPS compared to speedometer accuracy is off by just over 3% with my GLS with 22 inch factory option MO spec tires and wheels - and with 21 inch wheels and MO spec tires the same size as the factory provided ones accuracy is off by more than 7%. Has anyone with the 21 and/or 22 inch wheels checked their speedo accuracy versus a separate GPS? I am curious if your results are similar.
