If you install a aftermarket rearsets, you probably loss the rear brake light function.
If you want the rear brake light works again, then you need this!
Fit for : Most Japanese street and off-road motorcycles. Also fits most Nissin brake master cylinders.
Honda: All model, all year
Yamaha: All model, all year
Suzuki: All model, all year
Kawasaki: All model, all year
Accessories 
