CatEye SP12 FlexTight Rear Bracket allows front or rear mounting of clip in lights from on posts of 22.5mm to 32mm in diameter.
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Replaces the donor bracket that I had to use to upgrade the bracket on a no-brand front light. Never had any problems from Cateye products.
Arrived quickly, fit my Rapid Mini rear light and provides a solid and cheap upgrade from the elastic fitting.