Lighter wheels/tires equates to better acceleration. So that should mean that when comparin' wheels of the same manufacturer and design, but in different sizes (18" vs 19"), the smaller 18", which would weight less, should allow for better acceleration. However, 19" wheels are said to have better handling characteristics than 18". This of course assumes the tires on both wheel sizes are the same. Would the quicker acceleration of the smaller 18" wheels make up for (or maybe "offset" is a better word) the better handling characteristics of the 19" wheels?