Which kickstand type is least stable for parking a bicycle?

The least stable type of kickstand for parking a bicycle is the single-legged kickstand. This type of kickstand relies on a single point of contact with the ground, which can lead to instability, especially on uneven surfaces. When a bike is parked with a single-legged kickstand, any movement or weight shift can cause it to topple over more easily than other types of kickstands.

In contrast, a rear-mount kickstand typically provides better balance because it supports the bicycle closer to the rear axle, allowing for a more stable base. A two-legged kickstand offers even more stability since it disperses the bike's weight across two points of contact with the ground, significantly reducing the risk of tipping. The bottom bracket kickstand, while also stable, is less common and designed to provide good support by anchoring near the bike's center, but it's not as widespread in use as others.

Thus, the single-legged kickstand's inherent design makes it the least stable option for securely parking a bicycle.