convert 21-spd "mountain" bike to single speed OR just by a bmx bike?

Calvin C · 08-22-2007, 12:34 PM

I bought this cheap $200 bike from Target and I've already spent about $150 in accessories and repair fees. I spent $67 on the rear derailleur. I don't want to fix it anymore, I'm only 15 and my personal stash of cash is diminishing. Should I just get a BMX bike from Giant for around $185, or should I try to convert this thing to a single speed? would I need to replace the crankset and cassette, or is it possible to take the sprockets off the cassette and gears off the cranks and use the ones I need?