for the sake of discussion,
at a certain speed and tiempo posible siguro yan
going from low to a higher gear but not the other way around

kasi, di ba lower gears are bigger in size than higher gears
parang sa road/racer bike (btw, cyclist din ako)

so in theory, bigger to smaller gear parts pwede mag shift
with out clutch provided na sobra taas ng rpm kasi malaki papunta sa maliit.
while kung downshifting naman, maliit papanik sa malaki mas doble ata ang hirap na dadanasin ng tsikot dito..

and what's the point of shifting gears without suppressing the clutch anyways?