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@whippersnapper
I am just in the process of doing up a bike and making it single speed. I bought a singlespeed freewheel (18t) from Condor - the cheap one for a tenner. Having put it on the chain just doesn't seem to fit on the cog. I have tried the original chain (it was the original off an old 80's 10 speed Falcon). I have also tried a SRAM one I had kicking around but that is the same. It's as if the spacing between the pins on the chain is too long - it can't have stretched that much? I have checked Sheldon Brown but he doesn't mention different chain types (pin to pin length rather than width). Are there different sizes? Thanks.