Upshifts

[Lawrence]

Since the gearbox is a sequential box all the gears are spinning around at the same time, unlike in a car box where you have to spin up the next gear before selecting. Clutchless upshift is fine on a bike because of this, bit it can be done poorly if you dont practice. You'll find it will slot into gear alot easy at certain revs than others and should always be a slick, silent sounding gear change. If it grinds you've done it wrong! Downshifts with no clutch are a no-no (and practically impossible) and will result in damage. When I shift up I put a little pressure on the gear lever, a rock the throttle closed slightly (not fully closed just a few degrees back) and you'll simultaneously feel the gear lever click up into the next gear. You then accelerate as normal and whole thing takes a sec. Hope that helps!

Clutchless shifts are fine in a car too provided you're gentle.  Had to do it when the clutch cable on the Seicento I was in snapped so it's definitely possible, just can't do it as fast as on a bike.