A Glimpse into the Past: Ken Evans' Custom Carlton TT Bike

In the 1970s, Ken Evans, the then editor of "Cycling Weekly", was a fervent advocate for short-distance time trials. This passion is vividly reflected in his bespoke 1971 Carlton bicycle, a marvel of engineering tailored for swift, linear velocity. While minimizing weight was a consideration, the paramount objective was achieving maximum rigidity to ensure every ounce of power was efficiently transferred to the wheels.

Current custodian Dave Marsh of the Universal Cycle Centre in Rotherham highlights the frame's extraordinary construction. Unlike conventional steel frames that feature varying tube diameters, this Carlton stands out with its uniform 1 1/8-inch Reynolds 531 double-butted tubing for all three primary tubes: top, down, and seat. This design significantly augmented the surface area for the bike's elegant, lugless fillet brazing, contributing to an exceptionally stiff frame. Furthermore, the frame's exclusive construction for Evans allowed for an uninterrupted seat tube, an ingenious feature that might have been intended to enhance compliance, predating similar concepts by decades, such as Gerard Vroomen's MIN.D frame for Open Cycles.

Gerald O'Donovan, Carlton's manager and designer, was renowned for his experimental approach, evident in the sophisticated yet somewhat unconventional rear brake cable routing. Marsh explains, "The cable gracefully navigates two eyelets on the top tube before piercing through a minuscule pipe brazed directly into the seat tube." It remains a subject of speculation whether this elaborate routing offered superior aerodynamics or more potent braking due to its direct path, but its striking appearance is undeniable. Even more groundbreaking are the direct-mount brakes, a concept that was a full four decades ahead of its time. O'Donovan cleverly adapted Universal calipers by removing their backplates and mounting them onto prongs brazed to the forks and stays, a modification Marsh believes substantially improved performance through increased stiffness. Complementing these innovations, the bicycle's components primarily consist of Campagnolo parts, a blend of Nuovo and Super Record, accented by 3ttt aluminum handlebars, stem, and custom-drilled Mafac brake levers. The choice of Campy large flange 28-spoke hubs, another nod to stiffness, paired with lightweight French-made Super Champion Arc-en-Ciel rims and later-era Vittoria Competition Rally 21 tubulars, completes this meticulously crafted machine.

Ken Evans' 1971 Carlton time trial bike is more than just a piece of cycling history; it's a testament to unwavering dedication and pioneering spirit in bicycle design. The meticulous attention to detail, the innovative engineering choices, and the relentless pursuit of performance embodied in this machine remind us that true progress often comes from challenging conventions. It encourages us to appreciate the heritage of craftsmanship and innovation that continues to shape the world of cycling, inspiring future generations to push the boundaries of what is possible, while honoring the past.