Does the black optic low profile tire hurt the ride of 2015 a6

Yes. It's not recommended.

The black optic $1300 factory option is basically a wheel and tire package that is really more of a sport summer tire with larger rims than the standard sport package. If your worried about the ride quality a A6 with standard sport wheel option might be the way to go. I would dfrive both and see how much different they really are in person. Here is the dealer break down for the "black optic package" shown below. Black Optic Package ($1,300)Wheels: 8.5J x 20" 5-Arm-Titanium-Rotor Design. Tires: 255/35R20 Summer Performance. High Gloss Black Package and the "sport wheel package" with all season tires. 19" Sport Package ($1,200)Wheels: 8.5J x 19" 5-Double-Spoke-Design. Tires: 255/40R19 AS. Sport Suspension

about the only thing i think you will notice is you will feel more bumps in the road then you ussaly would due to ther ebeing less of a rubber cusion. Just be sure to stick with the same overal tire hieght and youl be fine. so if you have a 205,55,16 stay with a 205 sized tire