Originally Posted by
jimmuller
I can't speak to MTBs (they never listen anyway) but I'd say try a longer seatpost and a stem with more reach. In my limited experience with frames that were nominally too small that has worked just fine, provided the frame wasn't really too small.
Longer stem and moving the saddle back help somewhat. The good news is that a too-small bike makes your right-size bike feel so much nicer.