Open (stylized as OPEN) is a manufacturer of performance gravel bike and road bike frames based in Basel. Founded by Andy Kessler and Gerard Vroomen in January 2012, the company debuted with a single model, the O-1.0. It was claimed to be the lightest 29-inch production hard tail on the market. The Company's current line-up includes two all-road / gravel frames, the OPEN U.P. and OPEN U.P.(P.E.R.), a pure gravel frame , and a classic road bike frame, the OPEN MI.ND.
Open have sold frames with paint designs created in collaboration with various other companies.