This mirror is designed to sit on the end of your handlebars & give you a view of what's behind. As well as being suited to straight bars the mirror can be used with drop handlebars or most bar-ends just so long as the internal tube diameter is 16.5
- 20 mm. The mirror does not take from the handlebar length & you will not need to rearrange brake levers etc. to install. It is designed to be robust & folds away when not in use.