Originally Posted by Midwest X6
Personally, I would go 17" if you are planning on getting a separate set of wheels for them..
Also remember that a thinner tire is actually going to give you better winter traction than a wider tire
thanks.. as I thinking the same way... but not sure for 300hps car is it okay in 17"... I previous own the Acura MDX (same horses) and I used 18" winter tires, feel very safe.. not sure what will be like in X3.. smaller car with same power..