Originally Posted by
xwright
However, I did briefly look at some cranks and from my understanding a 9/10 speed crank will work with a 7 speed cassette, correct?
Yes, 9/10-speed cranks will work with a 7-speed cassette but the 7/8-speed chain might be a bit too wide to shift between the chainrings well and might rub on the big ring when you are in the small ring. However, a 9 or 10-speed chain will work with a 7-speed cassette.