OEM Wheel and tire info - for the record




- Front is 8” width with +45 offset, rear is 9” with +54 offset
- C63 hub center is 66.6mm
- Bolt circle is 5 x 112 mm (corrected)
OEM tire sizes:
- 18's stock is 235/40-18 front and 255/35-18 rear.
- 19's stock is 235/35-19 front and 255/30-19 rear.
Wider Tires:
With stock wheel sizes and offsets and stock ride height, 10 mm wider tires will generally fit without problems:
- 18's at 245/40-18 front and 265/35-18 rear.
- 19's at 245/35-19 front and 265/30-19 rear.
Some brands of 255 mm fronts and 275 mm rears MAY work but fitment may require different wheel offsets, and lowered cars may rub. Wider wheels are recommended. Check forums for feedback on specific tires and fitments.
Last edited by zcct04; Mar 22, 2016 at 12:18 AM.




either way, great to have all this info compiled into one thread. I know I spent a good amount of time reading through search results to find this same info.




- Front is 8” width with +45 offset, rear is 9” with +54 offset
- C63 hub center is 66.6mm
- Bolt circle is 5 x 112 mm (corrected)
OEM tire sizes:
- 18's stock is 235/40-18 front and 255/35-18 rear.
- 19's stock is 235/35-19 front and 255/30-19 rear.
Wider Tires:
With stock wheel sizes and offsets and stock ride height, 10 mm wider tires will generally fit without problems:
- 18's at 245/40-18 front and 265/35-18 rear.
- 19's at 245/35-19 front and 265/30-19 rear.
Some brands of 255 mm fronts and 275 mm rears MAY work but fitment may require different wheel offsets, and lowered cars may rub. Wider wheels are recommended. Check forums for feedback on specific tires and fitments.
Thanks,
Chris.
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- Front is 8” width with +45 offset, rear is 9” with +54 offset
- C63 hub center is 66.6mm
- Bolt circle is 5 x 112 mm (corrected)
OEM tire sizes:
- 18's stock is 235/40-18 front and 255/35-18 rear.
- 19's stock is 235/35-19 front and 255/30-19 rear.
Wider Tires:
With stock wheel sizes and offsets and stock ride height, 10 mm wider tires will generally fit without problems:
- 18's at 245/40-18 front and 265/35-18 rear.
- 19's at 245/35-19 front and 265/30-19 rear.
Some brands of 255 mm fronts and 275 mm rears MAY work but fitment may require different wheel offsets, and lowered cars may rub. Wider wheels are recommended. Check forums for feedback on specific tires and fitments.
18" Tire Sizes w/Diameters:
Front: P235/40R18 25.4” - OEM
Front: P245/40R18 25.7”
Rear: P255/35R18 25” - OEM
Rear: P265/35R18 25.3”
Rear: P275/35R18 25.6”
Rear: P285/35R18 25.9”
19” Tire Sizes w/Diameters:
Front: P235/35R19 25.5” - OEM
Front: P245/35R19 25.8”
Rear: P255/30R19 25” - OEM
Rear: P265/30R19 25.3”
Rear: P275/30R19 25.5”
Rear: P285/30R19 25.7”
The Best of Mercedes & AMG




The general number I have seen thrown around is 3% difference in rolling diameter. Stock it is about 1.5%, if you go to the larger front, you are at 2.8% larger, so may be ok without knowing exactly what the tolerance is that Mercedes builds in - hopefully someone has tried it and can tell you if it worked or not.




The wheels i have are the oem 19x8 and 19x9.








The shop mounted the tires and I headed home. Upon looking at the rubber in the rears they seemed a bit big for the rim. After investigation I believe all 4 of my rims are the same size - 18”x8”. However, when I take a tape measure to the rims mounted on the car they measure 9”. I assume the barrel is probably 8” ?
Should I switch the rears out for 235/40 or keep the 255/35 on the 8” rim.
I’m no tire expert and any advice is much appreciated!
Last edited by whiterockc63; Jan 16, 2022 at 03:29 PM.
The shop mounted the tires and I headed home. Upon looking at the rubber in the rears they seemed a bit big for the rim. After investigation I believe all 4 of my rims are the same size - 18”x8”. However, when I take a tape measure to the rims mounted on the car they measure 9”. I assume the barrel is probably 8” ?
Should I switch the rears out for 235/40 or keep the 255/35 on the 8” rim.
I’m no tire expert and any advice is much appreciated!
what tire sizes would be recommended?




If you don't have a limited slip diff then you are still going to overpower 275's.
A Wavetrac LSD was my very first mod and made a world of difference to getting off the line and limiting wheel spin.
If you don't have a limited slip diff then you are still going to overpower 275's.
A Wavetrac LSD was my very first mod and made a world of difference to getting off the line and limiting wheel spin.




Early on I ran E400 8.5/9 x18 wheels and they came with 235/40& 265/35 rears and the fronts caught the lip on my front guard.
Plus, I found that the 265's were actually about 5mm narrower than my Michelin 255's.
Early on I ran E400 8.5/9 x18 wheels and they came with 235/40& 265/35 rears and the fronts caught the lip on my front guard.
Plus, I found that the 265's were actually about 5mm narrower than my Michelin 255's.




