The CIO+ bike light fits all the bikes we have been testing so far. From our point of view the mounting and function of the CIO+ bike light can be problematic on a bike with 16 inch wheels or smaller, or on bikes with low angled seat stays. Therefore, we do not recommend to mount CIO+ on those bike types.
If you have a front fork with a large diameter, remember that you can extend the wire by rotating the key counter-clockwise.
If the bike light does not fit your bike upon arrival please contact our support team.