Got the recent Spider crank? Once you get it you are free to change the parts, you can change the 2 cogs 12 [13,14, 15] 16 t, ** and the 1 chainring,
these days to as small as 39t.. or 46 .. its a standard 130 bolt circle. arm no longer swaged to the chainring..
BB is standard British thread , to change whole crank set & BB..
61" is a good gear, (old fixie riders like them ), and you get a freewheel , in the hub..
More exotic (& heavier), are internal gear cranks, but they are not weightless.. I have a 54:15, 3 speed, reduction gear acts like a 21t..
** there are after market 3 cog sets , from SEA, in Titanium ...
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Last edited by fietsbob; 01-12-18 at 09:11 AM.