Downsizing Wheels
Thread Starter
Newbie
Joined: Mar 2025
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Downsizing Wheels
Hello new member here. I am interested in the extra features and power from the GL/GLS 550 but wondering how many have downsized to a 20” wheel and what is required do you have recalibrate speedo to correct mileage and speed?
MBWorld Fanatic!
Joined: Jan 2014
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From: USA - Minnesota
2014 GL350 / 2026 BMW iX iDrive60
No calibration is required if you fit the proper tire size as the outside diameter remains the same—-or at least so close as not to matter. Look for wheel/tire size combinations that were fitted by the factory on 20” 550 GL/GLS models, if any, or non-550 models. If memory serves, the 550 has larger diameter brakes which will potentially further restrict your wheel options if you go with non-OEM wheels.
Thread Starter
Newbie
Joined: Mar 2025
Posts: 4
Likes: 0
No calibration is required if you fit the proper tire size as the outside diameter remains the same—-or at least so close as not to matter. Look for wheel/tire size combinations that were fitted by the factory on 20” 550 GL/GLS models, if any, or non-550 models. If memory serves, the 550 has larger diameter brakes which will potentially further restrict your wheel options if you go with non-OEM wheels.
thanks for the great info. Forgot about the brake issue.
