Innovative lighting system @Saul V. Their website mentions that the widest rim the product can fit is 38mm and the deepest rim 45mm. It seems that much wider tires obstruct the lights' ability to be seen from the front or rear and really only lights on the sides. It doesn't appear that those lights can be mounted on a fat tire rim with the current design; however, the Revolights has a (Link Removed - No Longer Exists)on their site, with one option being 'Other' for non-standard wheel sizes. Here's the contact info: