I think 16" wheels are the perfect size for a GN (my opinion only). Trouble is you're somewhat limited on selection for drag radials. Mickey Thompson ET streets only have one, 255 50R/16. The tire looks and works great but your wheel back spacing has to be right. My wheels are Weld Prostars, 16"X8" w/4" back spacing. (I don't think they make them any more) They used to rub the frame going around tight corners until I put on aluminum drums which are a bit thicker. Also the tire diameter is smaller than I'd like. A 55 or 60 series would be better for the track. With my loose converter I'm pushing 5500 rpm in the 1/8th mile. Here's a couple pics. The car is jacked up and the spacing between the tire and the frame is actually a little less once you drop it down.