The Birth of Mountain Biking on Mt. Tam — Marin Living
The Birth of Mountain Biking on Mt. Tam — Living in Marin The Birth of Mountain Biking on Mt. Tam April 14, 2026 Before the glossy magazines, the carbon-fiber frames, and the global competitions, there was a dusty fire road on Mount Tamalpais, a group of long-haired friends, and a bunch of beat-up, pre-war bicycles. This is the story of how a grassroots movement, fueled by a thirst for adrenaline and a spirit of playful competition, gave birth to the sport of mountain biking. From the heart of Marin County, a revolution on two wheels unfolded, transforming the way we think about cycling and our relationship with the great outdoors. It’s a tale of innovation, community, and the enduring allure of a wild ride down a mountainside. Join us as we explore the origins of this iconic Marin-born sport. — Dispatches from the golden hills In This Story → The Klunker Revolution → The Repack Race → The Birth of the Breezer → The Legacy on the Mountain → References Chapter One The Klunker Revolution The seeds of mountain biking were sown in the early 1970s, not in a high-tech lab, but on the sun-drenched slopes of Mount Tamalpais. A group of friends, many of them road-racing cyclists from the Velo Club Tamalpais, were looking for a new kind of thrill. They found it in the form of “klunkers” – old, heavy, single-speed bicycles from the 1930s and ‘40s, with fat balloon tires and sturdy frames, originally designed for paperboys and beach cruising. [1] These bikes were the antithesis of the sleek, lightweight road bikes they were used to. But on the rugged fire roads of Mt. Tam, they were perfect. The riders would push their heavy steeds to the top of the mountain, then bomb down the dirt trails, a wild grin plastered on their faces. It was a raw, unfiltered form of cycling, a world away from the structured rules of road racing. Among these early pioneers were figures who would become legends in the sport: Gary Fisher, Charlie Kelly, and Joe Breeze. They were part of a counter-culture movement that valued freedom, adventure, and a healthy dose of irreverence. Their klunker adventures were an extension of this ethos, a way to connect with nature and push the boundaries of what was possible on two wheels. [2] Chapter Two The Repack Race As the klunker scene grew, so did the friendly rivalries. It was only a matter of time before someone suggested a race. In 1976, Charlie Kelly and Fred Wolf organized the first Repack race, a time-trial downhill on a treacherous 2.1-mile course that dropped 1,300 feet. The race got its name from the state of the bikes’ coaster brakes after a single run. The intense heat would vaporize the grease, forcing the riders to “repack” the hubs with fresh grease before their next run. [1] The first race, held on October 21, 1976, had just ten riders. Alan Bonds, the only one who didn’t crash, took home the victory. But the Repack race was about more than just winning. It was a gathering of the tribe, a place to share stories, compare bike modifications, and push the limits of their machines and their courage. “I’d lunge forward, driving all my weight on the pedals to produce enough momentum to help me muscle the tall gear over a slight rise 50 yards out. From there it was all downhill and speed.” — Joe Breeze, on the Repack race The Repack races became a local phenomenon, attracting riders from all over the Bay Area. The events were informal and chaotic, with a spirit of camaraderie that was infectious. The races also served as a real-world testing ground for bike technology. The constant punishment of the Repack course exposed the weaknesses of the old klunkers, sparking a wave of innovation as riders began to modify and improve their bikes. [3] Chapter Three The Birth of the Breezer One of the most influential figures to emerge from the Repack scene was Joe Breeze. A talented frame builder and racer, Breeze saw the need for a new kind of bike, one designed specifically for the rigors of off-road riding. In 1977, he built the first purpose-built mountain bike, the Breezer 1. [3] Unlike the modified klunkers, the Breezer 1 was built from the ground up with all-new components. It featured a stronger, lighter frame, better brakes, and a wider range of gears. It was a revolutionary machine that set the standard for all mountain bikes to come. The Breezer 1 is now on display at the Smithsonian’s National Museum of American History, a testament to its significance in the history of cycling. Breeze’s creation was an immediate success. After winning a Repack race on his new bike, he was inundated with requests from other riders. He built a small batch of nine more Breezers, which he delivered in 1978. The mountain bike industry was born. Chapter Four The Legacy on the Mountain The Repack races and the invention of the Breezer were just the beginning. The sport of mountain biking exploded in popularity in the 1980s, spreading from the slopes of Mt. Tam to the rest of the world. Today, m