GLB 250 Speedometer Calibration
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Newbie
Joined: Apr 2024
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GLB 250
GLB 250 Speedometer Calibration
My speedo is off by 2% on OEM tires/rims. I bought it new, so it’s like this from factory. When my speedo says I’m doing 100km/h, it’s actually 98km/h. I’ve verified this via gps apps (Google maps) and also driving through radar digital speed signs.
what are my options? Can I do this myself? Is this a warranty claim?
what are my options? Can I do this myself? Is this a warranty claim?
MBWorld God!
Joined: Dec 2019
Posts: 32,681
Likes: 6,420
My speedo is off by 2% on OEM tires/rims. I bought it new, so it’s like this from factory. When my speedo says I’m doing 100km/h, it’s actually 98km/h. I’ve verified this via gps apps (Google maps) and also driving through radar digital speed signs.
what are my options? Can I do this myself? Is this a warranty claim?
what are my options? Can I do this myself? Is this a warranty claim?
MBWorld God!
Joined: Dec 2019
Posts: 32,681
Likes: 6,420
MBWorld Fanatic!
Joined: Sep 2013
Posts: 2,367
Likes: 702
2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320
My speedo is off by 2% on OEM tires/rims. I bought it new, so it’s like this from factory. When my speedo says I’m doing 100km/h, it’s actually 98km/h. I’ve verified this via gps apps (Google maps) and also driving through radar digital speed signs.
what are my options? Can I do this myself? Is this a warranty claim?
what are my options? Can I do this myself? Is this a warranty claim?
Also, tire wear will make slight changes in the diameter of the tires which will affect the calibration. Your true speed will decrease a bit as tires wear from new to worn out.
Facts from our experience: There is a roadside radar speed indicator at the change from 55 MPH state highway to 35 MPH main city street on a route we travel daily. My wife’s ‘21 GLB250 always gets 35 MPH on both the roadside and her speedometer. My ‘23 GLA250 always gets 36 MPH on the roadside at 35 MPH indicated on my speedometer. That’s about 3%. This may be the tolerance to which the system is built.
On the bright side, if your indicated speed is less than actual, then the indicated odometer mileage should be less than actual, and your warranty coverage will be a bit longer. 🙂
MBWorld God!
Joined: Dec 2019
Posts: 32,681
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Just my opinion, but I think 2% is far more accurate than the older mechanical speedometers.
Also, tire wear will make slight changes in the diameter of the tires which will affect the calibration. Your true speed will decrease a bit as tires wear from new to worn out.
Facts from our experience: There is a roadside radar speed indicator at the change from 55 MPH state highway to 35 MPH main city street on a route we travel daily. My wife’s ‘21 GLB250 always gets 35 MPH on both the roadside and her speedometer. My ‘23 GLA250 always gets 36 MPH on the roadside at 35 MPH indicated on my speedometer. That’s about 3%. This may be the tolerance to which the system is built.
On the bright side, if your indicated speed is less than actual, then the indicated odometer mileage should be less than actual, and your warranty coverage will be a bit longer. 🙂
Also, tire wear will make slight changes in the diameter of the tires which will affect the calibration. Your true speed will decrease a bit as tires wear from new to worn out.
Facts from our experience: There is a roadside radar speed indicator at the change from 55 MPH state highway to 35 MPH main city street on a route we travel daily. My wife’s ‘21 GLB250 always gets 35 MPH on both the roadside and her speedometer. My ‘23 GLA250 always gets 36 MPH on the roadside at 35 MPH indicated on my speedometer. That’s about 3%. This may be the tolerance to which the system is built.
On the bright side, if your indicated speed is less than actual, then the indicated odometer mileage should be less than actual, and your warranty coverage will be a bit longer. 🙂
Thread Starter
Newbie
Joined: Apr 2024
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GLB 250
Appreciate all the comments. I suppose 2% isn’t much after reading other comments. It’s not the end of the world, just a bit annoying for this perfectionist.
In the last 10 years I owned 2 Mercs and 4 Volvos. Both this GLB250 and my R350 were 2% under. All the Volvos were bang on. I’m also aware the Volvos can be adjusted in the software. I figured that in today’s digital age where we can send satellites into space with 100% accuracy that we could calibrate a wheel 😂
Wasn’t sure what was possible on the Mercs, but I’m glad I asked. There are YouTube vids showing how to adjust, but they didn’t seem to work for me. If I do find a way, I’ll update here.
In the last 10 years I owned 2 Mercs and 4 Volvos. Both this GLB250 and my R350 were 2% under. All the Volvos were bang on. I’m also aware the Volvos can be adjusted in the software. I figured that in today’s digital age where we can send satellites into space with 100% accuracy that we could calibrate a wheel 😂
Wasn’t sure what was possible on the Mercs, but I’m glad I asked. There are YouTube vids showing how to adjust, but they didn’t seem to work for me. If I do find a way, I’ll update here.
MBWorld God!
Joined: Dec 2019
Posts: 32,681
Likes: 6,420
Appreciate all the comments. I suppose 2% isn’t much after reading other comments. It’s not the end of the world, just a bit annoying for this perfectionist.
In the last 10 years I owned 2 Mercs and 4 Volvos. Both this GLB250 and my R350 were 2% under. All the Volvos were bang on. I’m also aware the Volvos can be adjusted in the software. I figured that in today’s digital age where we can send satellites into space with 100% accuracy that we could calibrate a wheel 😂
Wasn’t sure what was possible on the Mercs, but I’m glad I asked. There are YouTube vids showing how to adjust, but they didn’t seem to work for me. If I do find a way, I’ll update here.
In the last 10 years I owned 2 Mercs and 4 Volvos. Both this GLB250 and my R350 were 2% under. All the Volvos were bang on. I’m also aware the Volvos can be adjusted in the software. I figured that in today’s digital age where we can send satellites into space with 100% accuracy that we could calibrate a wheel 😂
Wasn’t sure what was possible on the Mercs, but I’m glad I asked. There are YouTube vids showing how to adjust, but they didn’t seem to work for me. If I do find a way, I’ll update here.
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MBWorld Fanatic!
Joined: Sep 2013
Posts: 2,367
Likes: 702
2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320
Appreciate all the comments. I suppose 2% isn’t much after reading other comments. It’s not the end of the world, just a bit annoying for this perfectionist.
In the last 10 years I owned 2 Mercs and 4 Volvos. Both this GLB250 and my R350 were 2% under. All the Volvos were bang on. I’m also aware the Volvos can be adjusted in the software. I figured that in today’s digital age where we can send satellites into space with 100% accuracy that we could calibrate a wheel 😂
Wasn’t sure what was possible on the Mercs, but I’m glad I asked. There are YouTube vids showing how to adjust, but they didn’t seem to work for me. If I do find a way, I’ll update here.
In the last 10 years I owned 2 Mercs and 4 Volvos. Both this GLB250 and my R350 were 2% under. All the Volvos were bang on. I’m also aware the Volvos can be adjusted in the software. I figured that in today’s digital age where we can send satellites into space with 100% accuracy that we could calibrate a wheel 😂
Wasn’t sure what was possible on the Mercs, but I’m glad I asked. There are YouTube vids showing how to adjust, but they didn’t seem to work for me. If I do find a way, I’ll update here.
There is an app for our Ford trucks and GM trucks include tire size selection in the onboard menu. If I find anything asking MB techs I know, I’ll post it here.
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