What is the maximum diameter that the CIO bike lights can be mounted on? Mille Stech Jensen January 05, 2021 10:59 Updated Front light: Ø50mm / 1.96 inch Rear light: Ø35mm / 1.38 inch Related articles Does the light fit all kinds of bikes? Are the lights waterproof? What is the maximum angle for the fork and seat stay that CIO can be mounted on? On which side of the bike should CIO be mounted? How much does the CIO bike light weigh? Comments 0 comments Article is closed for comments.