GLB ride quality - Page 2 - MBWorld.org Forums

Oct 29, 2021 | 06:58 AM

#26

Vladimir Livson

Super Member

Joined: Jan 2021

Posts: 557

Likes: 204

2021 Mercedes GLB250 4Matic

Quote:

Originally Posted by Odd Piggy

The alignment would have to be very bad for it to affect ride quality like that. Glad you got it solved.

BTW-one of my nearby MB dealers has a plate in the floor of the car wash that does some sort of rudimentary alignment check every time a car goes through. I wonder if something like that would have caught the problem.

I think the scanner mounted into the floor is just the camera that reads tire thread depth.

Oct 29, 2021 | 10:15 AM

#27

GLB_AMG

Newbie

Joined: Jul 2020

Posts: 5

Likes: 2

GLB 250 AMG Line

it's quite common actually to have misaligned cars straight from factory

Oct 30, 2021 | 12:29 AM

#28

Odd Piggy

MBWorld Fanatic!

Joined: Sep 2013

Posts: 2,349

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2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320

Quote:

Originally Posted by Vladimir Livson

I think the scanner mounted into the floor is just the camera that reads tire thread depth.

When I toured the shop they told me that the metal plates checked the alignment. I didn’t question it.

Oct 30, 2021 | 12:42 AM

#29

Odd Piggy

MBWorld Fanatic!

Joined: Sep 2013

Posts: 2,349

Likes: 696

2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320

Quote:

Originally Posted by GLB_AMG

it's quite common actually to have misaligned cars straight from factory

I think all of the GLBs sold in N America are built in Mexico. Could it be that their QC is not yet up to speed? I have had one new car with bad alignment, but not my Benzes.

Apr 8, 2022 | 11:02 PM

#30

Odd Piggy

MBWorld Fanatic!

Joined: Sep 2013

Posts: 2,349

Likes: 696

2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320

Quote:

Originally Posted by chassis

Mercedes doesn't know what they are doing with tire pressure, and more broadly they don't know what they are doing with design and manufacture of their products. The conflicting tire pressure information is one example of many.

I set my tires to the max pressure listed on the sidewall for fuel economy and treadwear reasons. Almost no one agrees with me on this, that's OK.

Ride quality is related to how many inches of tire sidewall you have. Tire pressure has a far lower effect on ride quality than sidewall height has.

At the risk of opening up a can of worms, I went to Continental Tire’s commercial site where they describe how large trucks and buses determine what tire pressure to run [there is nothing like that on the passenger vehicle site]. They divide the maximum rated load by the maximum inflation pressure to get psi/pound. Then they compare the number of tires on each axle times the maximum rated tire load to the actual load for each axle and reduce the tire pressure from maximum until the axle load is reached, but no more than 25% reduction. Of course, highway transport trucks will use the actual load from the scales, so I used the GAWR for the front and rear axles on my GLB for the calculation. That gives 38 psi front and 39 psi rear while MB uses 43 psi all around for my 235/50 R 19 99H (1709 pounds at 51 psi) tires at full load.
MB seems to be quite conservative in their pressure recommendations at 10%+, but I’m not an automotive engineer, either.

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