What is the maximum diameter that the CIO bike lights can be mounted on? Mille Stech Jensen November 08, 2017 14:41 Updated Front light: Ø50m / 1.96 inch Rear light: Ø35mm / 1.38 inch Related articles Does the light fit all kinds of bikes? On which side of the bike should CIO be mounted? Are the lights waterproof? How much does the CIO bike light weigh? What is the maximum angle for the fork and seat stay that CIO can be mounted on? Comments 0 comments Article is closed for comments.