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What is the largest rim and tire I can run. I want to keep the tire sidewall as big as possible. I do not care if my speedo is off. I have a 2019 GLC coming in a month so I want to sort it out now..

Any body?
 

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Hi and welcome to the forum. You need to add your location to your profile so we all know where you are since replies may need to be market specific. If I understand you correctly you want to increase the overall rolling diameter of your rim and tyre combination. It would help if you could explain why you feel you need to do this. MB have spent millions in determining the optimum rolling diameter for their GLC range and even then they have had to accept a compromise with RHD cars due to steering geometry issues. Surely any increase will immediately cause clearance problems requiring you to limit the turning circle to prevent fouling. Moving anything outside of the manufacturer's design parameters will impact efficiency. You will immediately invalidate your 3-year warranty and, of course, you will need to declare the modification to your insurer or you will find yourself driving without any insurance. If you are creating a "donk" car for perhaps customising/promotional purposes, you will know all this already.
 

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Definitely illegal if in UK.
 

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What Toobad and Phil said !

Sounds a bit potty to me, why would you want to do that especially when at risk of breaking the law, unless you're out in the sticks somewhere in the USA maybe :smile2:
 

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My 2017 GLC 300 Coupe was delivered from the factory with 255/45 20’s front and 285/40 20’s rear. The wheels are 20” AMG Mini Spokes. The car now has over 12K miles and the tire/wheel package has performed awesomely.

DeanL
 

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What Toobad and Phil said !

Sounds a bit potty to me, why would you want to do that especially when at risk of breaking the law, unless you're out in the sticks somewhere in the USA maybe :smile2:
From out here in the sticks somewhere in the USA to LONS:

I find your comment about tire/wheel modifications to our GLC’s inappropriate for this forum.

DeanL
 

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From out here in the sticks somewhere in the USA to LONS:

I find your comment about tire/wheel modifications to our GLC’s inappropriate for this forum.

DeanL
Sorry Dean, wasn't meant to offend in any way at all.

I've been to the USA a few times and driven through some remote areas where car mods seemed to be very common and many were extreme imo.

There was one mod car event near Vagas where cars had wheels the size we would use on a truck. You wouldn't get away with those in the UK which is all I meant so appologies for not wording my post very well. The cars were interesting though and my wife had to drag me away.

I've seen the same thing in OZ and New Zealand so could just as easily have said that.

Loved my USA trips btw and we found the locals friendly and accommodating wherever we went. Last trip which covered most of the canyons, Monument Valley, Vegas, Death Valley and down to San Francisco was pretty special though I found the section of Route 66 I drove a bit disappointing tbh

cheers
Bob
 

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Bob:

No offense taken, but had to return the comment to you. Please come back to the US anytime. Most of us are normal car buffs and keep our vehicles stock as delivered. I have a 26 year old 911 (actually a 964) that is bone original except for a Sony radio.
I agree old Route 66 ruminants are pretty disappointing despite the hype it gets.
Have a great day and I look forward to connecting with you again on this forum.

DeanL
(In Arizona, USA)
 
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