The Mirrycle Road Mirror was developed exclusively to fit Shimano STI shifter/brake levers without interfering in any way. The Road Mirror fits almost all the different shift/brake combos. It goes on quickly and easily with the included tools. Just a flick of your eyes allows for a quick view behind. And, it can be attached to either the left or right side lever. Let's be careful out there.
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this is a great mirror and works as advertised. Be sure that if it is loose, then you should use the shim(s). Also, do not tighten too tight, because if you bump it, there should be some give.