[MercuryMan]

How does the GLA feel on the road at high speeds? Say, 70 to 90mph on the motorway?What about road and tire noise? Does the GLA stay quiet and smooth?
Cheers!

 

[roytheboy]

The GLA is rock steady at any speed, including 70 to 90, and the road noise is not bad for a hatchback. My C-Class had less road noise but that was a saloon. Hatchbacks tend to be slightly boomy compared to saloons, and the GLA is no different. Road noise depends a lot on what tyres you run. Winter tyres are obviously a little more noisy than summer tyres.

 

[bigmouth]

I must say the noise insulation for the underbody of the GLA is not good.However, after I changed the four RFT to normal tire, the noise decreased substantially.

 

[roytheboy]

Run-flat tyres are notoriously noisy and uncomfortable due to the stiff side walls.

 

[MercuryMan]

Hey guys!
Thanks for the info! Why do the Run-flat tyres cause more noise??
Cheers!

 

[roytheboy]

Because the side-walls are stiffer, so they transfer more noise and vibrations through to the car shell. If you google the issue there's plenty to read about it on the web e.g. http://jalopnik.com/everyone-hates-run-flat-tires-464884753 and http://www.autoguide.com/auto-news/2012/05/run-flat-tires-why-you-should-or-shouldnt-buy-them.html and http://tires.about.com/od/understanding_tires/a/Why-I-Dislike-Runflat-Tires.htm