Originally Posted by
terrymorse
Um, do you know you can get wider range 7-speed cassettes than the 13-21 you now have? 11-28, 13-26, to name just two. Both Shimano HG50, maybe $30 each. You'll need a longer chain, too.
Less expensive than new cranks.
+1 A new crank is probably the most expensive way to go... especially a triple.
Get a new RD and MTB cassette...
