Well if your running front free wheel then, you must have been running a rear fixed cog, and if i remember correctly they are different thred sizes, so you cant just swicth, also 'da bomb' wheel was basicly a bmx wheel, wasnt very 'wide' and it was 14 mm but the advantage of not running a ffw is that you dont rip millions of pairs of trousers. Cheers WiLkY