Hi just thought I would post my 18" wheel upgrade information as I did a lot of reading on this forum before I went ahead.
So wanted to up grade from std 16" to 18" but did not like the most merc wheels or could not afford the AMG one's I did like.
So being a 55 year old boy racer ( well in my head) went to the aftermarket world. I wanted some deep dish style wheels.
After a month I found these wheels for sale off a CLS500,they were originally sold in the UK by Wolfrace Wheels under the name Shark but are actually Ruff racing wheels, brought this set via ebay and I assumed they were polished alloy but the outer rim is a stainless steel bonded on trim.
They are 8.5 and 9.5 ET35 x 18 rims which the forum said would fit.
They do fit but not with out some minor issues, had to change the tyres to 225/40/18 front ( contacts 5) and the rear to 255/35/18 ( also contacts)
The first issue is I needed 60 degree wheel bolts as Merc one are raidus ones and will not fit, I used 25mm long bolts for these wheels, original bolt hole are for 14mm bolts but I use M12 bolts but again checked on forum and that said it was OK as long as the wheel bolt fills the full tappered hole, which they do.
On first fitting rears all OK clearance all round JUST
Fitting the fronts they locked up on the tyre against the strut leg, this because the Contact 5 have a rim protector moulded on the tyre and it sticks out a few mm, so dug out a old set of 3mm spacers, problem cured with no issues on full lock, with different tyre you may not have this issue.
The wheel centres on the rear were OK but the front would not fit due the the grease cap coming through the wheel centre.
So after a dig through my steel stock box of old off cuts found some 66mm tube which I cut off 2 x 7mm rings, which I painted silver and bonded in to the wheel and then fitted the centre cap over that.
So bit of mucking about but OK, so the thanks to the forums for all the info which proved to be all good and big 18" will fit on a 200K