Which technique is most effective for stopping quickly on a motorcycle?

Using both brakes at the same time is the most effective technique for stopping quickly on a motorcycle. This method maximizes braking force and allows for more controlled stopping. The front brake engages the majority of the motorcycle's stopping power—typically around 70%—because of the weight transfer that occurs when braking. This weight transfer shifts the motorcycle’s center of gravity forward, increasing the grip of the front tire.

Combining the front and rear brakes helps to stabilize the bike and distribute braking forces more evenly, reducing the risk of skidding or losing control. It's essential to apply the brakes smoothly and progressively to maintain balance, especially since sudden or harsh braking can lead to loss of traction.

Other techniques, such as using the rear brake only, shifting down to first gear, or applying brakes gradually, do not provide the same level of stopping efficiency or control. The rear brake alone might not provide enough stopping power, shifting gears would only be beneficial in certain conditions but is not directly related to quick stopping, and applying brakes gradually is counterproductive when quick stops are necessary.