The Cycle Star E is the premium rear-view mirror for bicycles. The new pentagonal mirror shape in the CYCLESTAR series has an even larger mirror surface than other models. The mirror's rubber frame and shatterproof glass protect against injuries in the event of collisions. This mirror is approved for fast e-bikes, as it has the E test mark, but is also suitable for all other bikes. It is mounted using a clamp on the handlebars or with an adapter in the handlebars (inner handlebar diameter 14.5-18.5 mm), whereby the handlebars may be angled at a maximum of 45°. An ''upright'' or suspended under the handlebar is possible. Features: Material: Plastic Test mark: E Shatterproof glass Rubberised frame Handlebar mounting edit. Dear customer, We would like to point out that the inner diameter of 14.5-15.5mm stated on the packaging is an error. Busch & Müller KG state the value themselves as 14.5-18.5mm