The H+Son Formation Face is an extremely lightweight 42mm-profile rim. Formation Face is a true V Profile Rim, with no stress points.It is a professional, elegant rim. It can be used for training, travelling or just riding, for long distances, fixed gear and daily rides. It\'s perfect if you are looking forward a hight quality wheel. You cannot mount brakes on this wheel because it has no braking surface.The size is 700c, meaning it is compatible with all road-bike tyres. You can mount 23, 25 or 28 tyres and will need a 60mm-valve inner tube. And it is crucial you mount a rim strip between the tyre and the inner tube to reduce or prevent punctures.