Just wonder which is better performs with 18" or 19" wheel on your C300 and C350?

 

18" is a more comfortable ride than 19"s

 

For just performance. Go for 18" since they will allow you to have thread on the tires.

 

Very true! I have had 17"s 18"s and 19"s on my car. I liked the ride of the 17"s most but 18" has the combination of looks and ride. If you do a lot of city driving with bad roads I would stay way from 19"s

 

18" all the way.

 

I have 18 and they are fine. upgrading to 19 as the 18 is looking a little small on the car.

 

18

 

This! I cannot stress how much I regret getting 19's sometimes. Driving through downtown Houston is always anxiety inducing. They look nice, but if I could go back I would get 18's...maybe even stick to the 17's.

 

For performance....18's all the way.
In general, you want to go as small as you can that your brakes will allow, however for me, my limit is a sidewall size of 45 and below.

From a cost perspective, try to stay away from 19s. I know this might sound counter intuitive, but 19 inch tires actually cost more than 20s.

 

OK.. I am thinking to get AMG 18" on my C350. What is your opinions about this.

 

I would go 18' for sure.
For oem replica wheels, you can't go wrong with buying from our vendor here on mbworld; Vassili from Powerwheelpros. Highly recommended by members here.

 

Don't go with the cheesy AMG sticker. Find some with AMG engraved. I own 19's, they look good but ride bad. Also I have 2 bent wheels. 265-30-19 on the rear and 255-35 on the front.

 

18" for sure. Allows for a little bit more sidewall. 19" will be rough

 

I actually considered these rims. Ended up with 19s niche m149 instead. Interestingly I went with Toyo Proxes 4 plus and they almost feel like stock ride. But 19s do look a little too big for my car. Specially with stock height.

 

I've had 17s, 18, and 19s and 18s are definitely the best compromise between comfort and performance - especially on a lowered car. I had 17s on my C300 lowered with super sport springs and the ride felt soft and a little spongy, especially in the corners. Then I went to 19s and the car handled like it was on rails but I could feel every little pebble on the road. Hitting a pothole felt like getting punched in the kidneys. When I bought my C350, I opted to keep the OEM 18 AMG wheels but still lower on SS springs and I'm super happy with the setup. It's low and performs really well without being too harsh. I also got the dynamic handling package which is really nice - especially on the highway. If I put it in sport mode it feels really stiff and handles like a sports car but when just cruising on the highway in comfort mode, it feels like a comfy sedan. I still consider 19s every now and then because I love the look, but every time I think back to having them on the C300 and how harsh they feel...ungh...18s are just fine.

 

I didn't realized this is not AMG OEM. What is your suggest?

 

I agreed with you.

 

Is that 18" AMG? What kind is that?

 

Those are AMG Multispoke

I've got these: http://www.google.com/url?sa=i&rct=j...25433337085581

 

this is mine with 18" AMG rims.. Would love to get 19" but not sure if roads here will allow it..

 

I didn't realized that. Thank for warning.