Originally Posted by
jefnvk
Thanks [MENTION=21724]cyccommute[/MENTION], good info. I do indeed have that BB tool, although I'll have to grab a new crank puller. Oh well, I have enough other newer bikes at home I'll eventually need it for, and its only $16. Spent far more than that on impact hex and star bits to take the motorcycle apart...
Completely forgot I have a 24t chainring which I believe is a 74BCD sitting in my toolbox too. May look into a 46 and 38 chainring, if a FD can handle a 14t jump.
I sure that the smallest inner ring for that crank is a 39. And I doubt you'll be able to find an outer ring in a 46.
Vuelta makes a 42, 44 and 48. The 44 and 42 are probably too close to the 39, although it does make for
an interesting "cross over" gear pattern (see top gear pattern).
The 24 tooth should work. I've done it before. It's a bit of a jump but not impossible. I'd opt for a cheaper Shimano front derailer if the current one doesn't work. They are far easier to set up and more forgiving than the more expensive Shimano derailers.
Finally, on the crank puller, the Park version has a replaceable pin. You can swap it for the narrower pin for a square taper. Park also sells
the CWP-7 which is a universal crank puller. The different sized pins are stored on the tool.