Hmmmmm.
I just noticed an interesting
possible limitation. There's a chainguard for the 10 speed cassette, which appears to be a pretty normal 11-30 or 11-32 range (difficult to determine).
Would this chain guard possibly eliminate the ability to change the cassette for something with a tighter range? Perhaps a 11-25? I wonder if the smallest sprockets would not sit below the guard, and thus the chain would ride on the guard and derail from the sprockets?