Highside Crash
A highside crash is one of the most dangerous types of motorcycle accidents. It occurs when the rear tire loses traction (slides), then suddenly regains grip. The abrupt re-engagement of traction causes the bike to snap upright and catapult the rider over the handlebars or the high side of the motorcycle.
Highsides typically happen when a rider chops the throttle or applies too much rear brake while the rear tire is sliding. The slide itself isn't the problem — it's the sudden recovery. When the tire hooks back up, all that rotational energy transfers violently through the chassis, flipping the bike and launching the rider into the air.
Highsides are more dangerous than lowsides because the rider is thrown at greater height and velocity, often landing on hard pavement with significant force. Modern electronics like traction control and slipper clutches are specifically designed to prevent the conditions that lead to highside crashes. For riders without these aids, the key prevention is smooth throttle control and never abruptly closing the throttle when the rear tire is sliding.
Highsides have become relatively rare on modern sportbikes thanks to IMU-based traction control that monitors lean angle, throttle position, and wheel speed 100+ times per second. Older bikes without electronics remain vulnerable — particularly 600cc and 1000cc supersports from the 2000s with abrupt power delivery and no rider aids. Counterintuitively, higher-skill riders sometimes suffer worse highsides than beginners because they're comfortable riding at the traction limit where the rear tire can break loose then suddenly grip.
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Frequently Asked Questions
What is the difference between a highside and lowside crash?
A lowside happens when the tires lose traction and the bike slides out from under you — you fall on the same side the bike is leaning. A highside occurs when the rear tire regains traction violently after sliding, catapulting the rider over the bike in the opposite direction. Lowsides are more common and generally less dangerous because you slide with the bike. Highsides involve being thrown through the air and often result in more serious injuries.
How do you prevent a highside on a motorcycle?
Prevent highsides by avoiding abrupt throttle or clutch inputs while leaned over, especially on bikes without traction control. If the rear tire starts sliding during acceleration, smoothly roll off the throttle instead of chopping it closed — sudden weight transfer can cause the tire to violently regain grip. Modern traction control systems prevent most highsides by cutting power the moment rear-wheel slip is detected.