MADE55

The only place Continental tires belong on a C63 is as the temp spare in the trunk.

Raleighc63

You don't have to have XL, just make sure the load rating is the same or higher than the stock tires. Do not go less!

GBlansten

I have Continental Conti Extreme Contact DW tires on my car and could not be happier. Admittedly I'm a complete idiot but I like the tires.

motorkas

Have both the DW's and DWS's (live in the metro DC area). The DWS's are on the stock 18's and the DW's are on my summer set of 19's. Just last week drove up to Canada and put the DWS's back on after spending the whole summer on the DW's (the DW's are back on).
Observations:

1) straight line performance is similar - you'd be hard pressed to tell the difference.
2) I actually give the wet weather performance to the DWS's (the DW's are good - you just feel more planted with the DWS's)
3) NO WAY the DWS's compare to summer performance tires in the corners: the DWS's have softer side walls (which makes highway cruising much more enjoyable) but going from dedicated summer tires to AS, you will notice a difference in cornering (and not for the better). Caveat - after driving on the DWS's for a week or two - you don't notice because you have adjusted but if your MO is to strafe corners quickly, you will not be satisfied.

Both are great tires - just be really honest with yourself with your driving style (and capabilites). I just can't see MOST people coming anywhere close to consistently using the full capabilities of dedicated summer tires on THE STREET. They're nice to have for those "I'm pushing it" moments, but really, how often are those, where all things being equal, you're not putting other people in jeopardy. If you're doing track work, get a dedicated set of track wheels and don't compromise on tires. For the street - the DWS's are fine for the occasional "spirited" burst but you will be aware of and find the limits a lot sooner than, the DW's - both have really good wear ratings and I've seen minimal wear with both sets (about 12,000 miles on each).

Raleighc63

You don't need xl tires. However you need to make sure that you stay with the same load rating or higher than the stock tires.

The fronts are 95y good for 1521 lbs.
The rear are 97y good for 1609 lbs.

Don't worry about the xl rating as long as the load rating is the same or better than what stock tires are.
You should however make sure they are at least "Y" rated (186mph).
I was looking at Nittos earlier and noticed all of their tires are "W" rated (168mph) or less.

Not got with them since I do some high speed runs at 170 mph plus.

C63northvan

thanks for the info, however, i was just on tirerack website looking at these fronts again, this a copy from their site:
245/40ZR18 93Y Load Index 93 = 1433lbs (650kg) per tire
Speed Rating “Y” = 186mph (300kph) $153.00 (ea.)
235/40ZR18 91Y Load Index 91 = 1356lbs (615kg) per tire
Speed Rating “Y” = 186mph (300kph) $148.00 (ea.)

have they recently changed the load index on these tires? sorry if this sounds redundant, but it seems like tires are not rated for our car !!
unless i'm looking at the wrong tires !!!

Raleighc63

The original tires are Front 95Y and rear 94Y. As long as you select and tire with the same or better load rating you will be fine.

Front: 235/40ZR18
Mercedes
Sidewall Style: Blackwall
Serv. Desc: 95Y
Load Range: XL
UTQG: 220 AA APrice: $243.00 (each)
Estimated Availability: In Stock
Qty:
Optional Road Hazard Program: Add $29.16 per tire

Rear: 255/35ZR18
Mercedes
Sidewall Style: Blackwall
Serv. Desc: 94Y
Load Range: XL
UTQG: 220 AA APrice: $300.00 (each)
Estimated Availability: In Stock

propain

C300