Hey there, Im about to convert my Trekk 4300 frame into a single speed. I plan on getting the Surly Singleator to tension the chain. As for the rear, can I use a cassete orshould I use a freewheel? I'm thinking the freewheel will work better as the cassette will ahve more rooom, allowing the chain to fall off. Also, for the front, can I just take off the outer and smalle ring and put spacers on the chainrings? Also, is a 32 in front and 16 in rear a good gear combo? I hear that for singlespeeds it should be a 2:1 ratio.