After a couple of searches I have found lots of dialogue and subjective opinions regarding the aesthetics of small center caps that expose the lug nuts versus the original size that covers it.

What I have not been able to find is what is the exact size for that small cap. I have a Chinese seller on the other end, communication is sketchy and returns would be a hassle.

If someone could provide the exact size in mm it would be greatly appreciated.

Thanks in advance.

 

on the SRT6 wheel, the inner hole is 70 MM, the area to cover is 83 MM

 

That is much appreciated.

 

To confirm this one at 75MM

http://www.ebay.com/itm/161472014415?_trksid=p2060778.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
and this beauty at 56MM

http://www.ebay.com/itm/4x-56mm-Auto-Wheel-Center-Hub-Cap-Emblem-Badge-Decal-for-AMG-A-B-C-E-S-R-series/321468581755?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D27538%26meid%3D483b7f7a6bcc4d89ba68f4b7b64535b7%26pid%3D100005%26prg%3D11353%26rk%3D3%26rkt%3D6%26sd%3D111346723055&rt=nc
will not work despite how much I really want them to?

 

75 MM just might squeeze into a 70 mm hole depending on how the plastic fingers on the back work on the first one, the second one you show is just stickers.
For a lousy $15, I'd say try the first one.

Let me know, I might get a set too for when I finish with rebuilding the set of SE wheels I have.
The OEM caps I have for these are pretty bad.
( SE wheels are SRT6 wheels that have all but the polished spoke surface painted metallic gray )

 

I got the amg caps on my srt6 wheels, had to use some glue to hold in place, they are to small for hole. I tried bending tabs out but was unable to get tight fit so glue and held in place with tape until dry. Yes they must be remove when changing tires easy to get off and put back on. The outside diamater will cover hole nicely.

 

Also there is a round stick on mirror that fits perfect over ctn hole in wheel

 

So 70mm centercaps would fit the inner hole. And 83mm would be needed to replace the SRT-6 lugnut cover centercap?

There are lots of options for 75mm I see on eBay.

What size did you go with? Must of been smaller then 70mm.


So for confirmation, a 75mm Mercedes centercap will fit the centerbore of a SRT-6 rim? It will just be a tight fit? My SRT-6 has MErcedes centercaps already, but they are fading and look like crap.
This looks just like them:
http://www.ebay.com/itm/NEW-SET-OF-4-MERCEDES-BENZ-YR-1989-2014-75-MM-WHEEL-CENTER-CAPS-HUB-CAPS-/321496994552?hash=item4adab6d2f8&vxp=mtr