Hello, I bought my daughter's 2013 GLK350 that has the OEM 20" wheels. I am thinking about installing the Metris, 17x7 wheels. I currently have the 20" OEM wheels and worry every time I hit a pot hole. Based on my findings the bore size for the Metris is 66.6, 5x112, offset 51mm, and thread size M14x1.5.. Unless I am missing something, does anyone see any reason why these would not work?

Glk wheels are tough, if your hitting pot holes that will ruin a rim , you will ruin the tire and suspension.

The standard original spec rims are 7.5Jx17 ET47.5 with the same centerbore and bolt pattern. So no reason that they won't work.

I do understand "downgrading" from the 20" rims though - my 2011 came with the sport suspension option, and the 20" wheels. I swapped them out for a set of GLE 19" wheels to get a little more sidewall protection, smoother ride, and hey, they look better. Not sure you'll get all that with Metris wheels (looks?).

Thanks for the reply. I recall walking through both Mercedes and BMW service departments and seeing what happens to wheels with low profile tires. I was amazed how the impact travels through the tire causing the wheel to bend or even crack. I am looking for a little more sidewall protection and a smoother ride. Not to mention how much the cost of 20" tires vs 17" are. I like the look of the G-series wheels, but understand the bolt pattern is not the same. I also like the 17" wheels that come on the winter package, but I haven't seen many pop up in California. The Metris alloys seem to be close to the Mercedes specs for the 17" and should be able to pick up a set for a reasonable price. Hope to post images one I get them. Thanks again.

I think the force that will bend or crack a rim isn't going through the sidewall, at least not when it's acting like a sidewall, but when the tire is entirely compressed so it's only rubber between the curb / pot hole and the rim. The same thing happens with bicycle tires, though with an inner tube you can often see the effect by the "snakebite" on the inner tube (two holes from being pinched between the pot hole and rim).

But the more (taller) the sidewall the more "shock absorber" is able to absorb the impact before the rim reaches the pinch point. I'm fairly impressed with how much better the ride got when I went from 20" to 19" wheels / tires (and the19" tires were older and more worn than the 20" tires). Going to 17" would be taking that to new levels - overkill for the roads here in Arizona (winter? What winter?) but if I was in the urban northeast US, I'd probably do the same thing. My Jeep does have 15" rims with (oversize) 31" diameter tires. I don't think twice about having to drive over a curb! ;-)

There are a lot of aftermarket 17" wheels that will fit at a reasonable cost. I have 17" Replika wheels for winter on my Mercedes and 18" on the BMW. Even the BMW\MB center caps fit.

That's the look I am after. I'm not sure if it's just me, but the 17" look so much better than the 20". I know some will not agree. In my opinion the 20" with the low profile just don't look right. To be honest I am not thinking of installing the 17" for winter driving, but more for looks and comfort of the additional sidewall thickness. It looks like most are swapping the 17" for winter driving only. Any reason why I would not be able to run them year round?

No reason at all you couldn't run 17" wheels year-round. Yes, taller sidewalls do reduce some of the handling advantages of low-sidewall tires, but these are SUVs, not sports cars. It's a big deal at the track, not so much schlepping back and forth to the grocery store.

Other advantages of the taller sidewalls include much (!) more protection for your rims from curb damage (especially if the tires are a bit wider, so the sidewalls "pooch out"), and of course, a noticeably smoother and quieter ride.

Thank you habbyguy. Year round it is. The search goes on.

Plus it makes new tires shopping cheaper for 17s vs 20s.

I am doing this as well. I just bent both of my back tire rims driving through Alabama... notoriously bad roads. good times. Does anyone know what rim this is?

OK so I bought a set of used Metris alloy wheels last night. They are 17x7 and 51 offset. My current wheels are 20x8 with I believe 47.5 offset. They came with a set of 225/65R17 tires. If I use the online tire size comparison chart they are awful close to the same. Mercedes winter wheels are 17x7.5 with 47.5 offset. The guy also gave me a set of OEM lug bolts which are different than my GLK lug bolts, and was willing to throw in a set of aftermarket TPMS's. My question is I assume I will use my TPMS's from the GLK and use the lug bolts from the Metris. Hope to get images once installed. Thank you.

Got around to installing the 17" Metris wheels onto my GLK. I had to use the wheel bolts from the Metris as the GLK wheel bolts are too long, and may have a different seat. Just put them on today, but I like them over the 20" the GLK came with.