mattdano

Hello!
I have a 2017 GLC300 4Matic with Sport Package.
I bought some 43 style rims for my GLC and the wheel studs from my old rims do not fit on my new rims. I would appreciate if someone could give me a recommendation..
(New rims are 20x8.5 with an offset of 35… and my old rims were 19x8 with an offset of 38)
Both rims have a hub bore size of 66.6 and a bolt pattern of 5x112.
When my old wheel studs are placed into my new rims, there’s about 12ish mm of room with no thread which needs to be filled with a spacer or I will just need whole new studs. If anyone knows of a wheel stud dimension I need, I would love to hear. Please see the attached photos of my old rims, new rims, and the old wheel stud on my new rims. For reference, my wheel studs are M14x1.5

Wvukidsdoc

Im guessing these are wheel BOLTS not STUDS, big difference. One is in the hub (studs) ans uses nuts, one is well a bolt, probably what you picture. I run old ML rims with snows on my wifes GLE and had the same problem. Bought shorter BOLTS off Amazon, chrome, full set was about $28 and have functioned perfectly last 3 years. You will need to figure out what length you need.

Wvukidsdoc

Oh they will be M14x1.5 thread, but you will need to figure out appropriate length (should engage around 1cm give or take) and if the new wheels are ball (likely) or cone (if aftermarket repros) taper, very important as well.

Wvukidsdoc

For reference your present bolt probably looks like this…



and you likely need a M14x1.5 ball taper bolt, around 30mm shank length based on how your photo appears. But if those are knock off repro rims using cone taper you REALLY need to figure it out so as not to lose the wheels.

Searching for these for instance might be a good option or you might need something a bit longer but with Amazon you can always order and return. You should have at least 6-7 engaged threads and a few more won’t hurt…

14mmx1.5 28mm Shank Length Ball Seat Factory Wheel Lug Bolts, Compatible with TT Allroad Quattro A3 A4 A6 A8 S4 S6 S8 Jetta Golf Tiguan Passat Corrado GTI

mikapen

Good advice.
Except that bolts that are too long will interfere with the brakes. Be careful that you have enough thread engagement, but not too long.

Wvukidsdoc

Yes on the GLE I went with 28mm, which were a bit short for my liking for the particular wheel application in question (old 6 spoke ML 17”) with only about 5 threads past the mating surface but 33mm the next step up would have been problematic about what might be behind the hub/clearing the caliper mounts. I’d also mention that forged studs/bolts with rolled threads like OEM are WAY stronger (probably metric 14.9 grade for OEM bolt) than CNC cut like the ones I listed but Chinesium forged seem only available in chromies, hence why I went chrome. I don’t personally think chrome would look good for the OP. That said if these actually are near grade 10.9 as advertised, with good engagement, care not to over torque, and not countless install cycles, one will probably be fine.

The ball vs conical seat is likely most important here, ball bolts will hold a conical wheel, for a while…. Conical may not hold ball wheel more than a few miles, both mismatch may have you seeing a wheel pass you on a curve and end up with you dead so best get that right. Lots of Youtube videos to illustrate how they look on the wheel.

S70Houston

I did EXACTLY that as well when I mounted new wheels on my wifes GLC. Also no issue whatsoever for me.

I bought these:
Here are the details: The Official 2016 GLC Picture Thread - MBWorld.org Forums