I am planning to build up a single speed using an old steel frame. I plan to use the shimano Sante cranks (in sublime condition) but they come in 39t/53t combination. My cogset gives me a 16t and 18t cog (actually a freehub conversion kit). I'm thinking that 42t will be ok for this cog set.

Will i need 110mm or 130mm BCD chainrings? I am thinking 130mm at the moment.

Also if I want to only have one chainring on the crank, can I re-use the bolts that was used for double chainring configuration?


The reason for swapping is mainly because of the size (39 too small and 53 too large!) and that the ones on the Sante are actually BioPace chainrings which may not be suitable for singlespeed/fixie due to varying chain tension (I do not use a tensioner as the frame has horizontal campy dropouts).

Thanks.