Bartubeless system is really realiable

Spoke wheels have a really interesting quality: their elasticity. This peculiarity makes them excellent for road and off-road use where even strong stresses and bumps do not affect the integrity of the rim, which would be on the contrary affected in alloy wheels.

Their elasticity is determined by the geometry of the spokes that stretch when the wheel is stressed.

Here is where the magic of the Bartubeless system happens: it allows the wheel to deform itself without letting air escape through the nipples.