Open Cycle
Open Cycle was founded in Switzerland in 2013 by Gerard Vroomen and Andy Kessler — Vroomen being the co-founder of Cervélo, one of the most influential road and triathlon bike brands in history. With Open, Vroomen set out to build the most versatile high-performance bicycle possible: a single carbon frame capable of running 700c road wheels for race pace or 650b gravel wheels for technical off-road, with clearance for tyres from 25mm to 60mm depending on the wheel choice. What Is Open Cycle and Who Founded It? The Open U.P. (Ultimate Performace) is the original and still definitive Open bike — a full carbon gravel frame with two complete wheelsets worth of tyre clearance, aggressive race geometry, and finish quality that rivals any boutique manufacturer. The O-Road is the step-up version with additional compliance tuning and slightly wider clearances for more technical terrain. Open's frames are manufactured at the same factory as Cervélo — arguably the best carbon fabrication partnership in the industry. Why Choose Open Cycle for Gravel? Open Cycle produce the most intelligently designed gravel bikes in the world. The concept of genuine dual-wheel-size compatibility — true 700c road performance and true 650b gravel capability from a single frame — has been copied by almost every major brand since Open introduced it. If you want the original, the best-executed, and the one designed by the person who invented modern triathlon bike geometry, Open is the answer.