Dmr single speed converter kit the single speed conversion kit is the most effective and easiest way of converting your bike to single speed set up without buying a whole new wheel two precision machined anodised spacers sandwich a single 16t cog to replace your entire 8 or 9 speed cassette matched up with a dmr tension seeker it is possible to run a conventional vertical dropout frame as a single speed bike buy dmr wheels tyres from chain reaction cycles the worlds largest online bike stor