looking for a bmx freewheel i headed over to my lbs this morning. after buying other parts now for my s/s i asked him if he had any partially used or spare freewheels. and like always he came through and hooked me up with an acs freewheel for free. however, when i get home i find out that its the 3/16" version my roadie used for the conversion uses 1/8" chains. so what do i do now? what size chain should i buy or am i looking at more parts?