The Adjustable A-Frame Ramp Challenge

Quick Overview

The A-frame ramp challenge pushed mountain bikers to their limits, incrementally increasing the ramp's angle from 22 degrees to a final 57.6 degrees. While initial angles were easy, even on a folding bike, steeper angles required advanced techniques like lifting the back wheel and eventually led to falls, demonstrating the physical and mental boundaries of riding such extreme inclines.

Key Points: The A-frame ramp's angle was incrementally increased from an easy 22 degrees to a challenging 57.6 degrees. Riders successfully navigated angles up to 45 degrees on mountain bikes, requiring techniques like lifting the back wheel to clear the peak. Safety measures included helmets (with chin bars), knee pads, and securing the ramp with ratchet straps and stakes. Adding 'cheater ramps' (kickers) at the base helped launch riders over the increasingly steep peak, preventing falls over the handlebars. At 50 degrees, the challenge became mentally and physically demanding, with the ramp resembling a vertical wall. Both riders experienced falls at the final 57.6-degree angle, indicating the practical and safe limit of the A-frame's design. The experiment highlighted that unlike skatepark spines, the A-frame's sharp peak at extreme angles made it unpredictable and dangerous.

Context: This video documents an experimental challenge to determine the maximum rideable angle of a custom-built, adjustable A-frame mountain bike ramp. The riders, Seth and Joe, aimed to push their skills and the ramp's design to its limits while emphasizing safety throughout the process. They compared the A-frame's characteristics to skatepark spines, noting key differences in transitions and predictability.

Detailed Analysis

The video documents an A-frame ramp challenge where two mountain bikers, Seth and Joe, incrementally increased the angle of a custom-built wooden ramp. Starting at a gentle 22 degrees, which was easily rideable even on a folding bike, they gradually increased the angle by 5-degree increments. At 30 degrees, the ramp started to look steep but was still manageable. By 35 degrees, the riders noted a significant difference, requiring more commitment and airtime. Safety measures were emphasized throughout, including wearing helmets (with chin bars added for steeper angles), knee pads, and using ratchet straps and stakes to secure the ramp. They also added small 'cheater ramps' (kickers) at the base to aid in launching over the peak. As the angle approached 45 degrees, the riders observed that the bike's chainring would hit the top if the back wheel wasn't lifted, and the ramp began to resemble a vertical wall. At 50 degrees, the challenge became genuinely intimidating, pushing the riders to their physical and mental limits. The final angle reached was 57.6 degrees, where both riders experienced falls, highlighting the extreme difficulty and danger. The experiment concluded that while incremental increases allowed for adaptation, there's a clear limit where the structure becomes too steep and dangerous, especially without the continuous transitions found in skatepark spines.