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°. It can be mounted ''upright'' or suspended under the handlebars. Features: Material: Plastic Test mark: E Shatterproof glass Rubberised frame Handlebar mounting edit. Dear customer, handlebar diameter 17.2-22 mm.