>>1032821I don't know, it's your friends, so you can trial it right?
If you have to raise the saddle much further to get good leg extension (slightly bent knee at the bottom of the pedal stroke) or it just feels cramped in general, then it's too small.
If it was strictly for shits and giggles, an undersized bike might be fun, but rigid mtbs really excel as a poor/ smart mans commuter/ gravel/ cx/ bikepacking/ touring/ hybrid bike so an undersized fit could get frustrating.
