Perimeter Disc Brakes

I saw a perimeter disc brake for the first time today. It was on a Buell motorcycle, and as far as I know, Buell is the only company using this design on a mass produced motorcycle.

Most disc brakes are mounted to the wheel hub, and the braking force is transmitted to the tyre through the spokes and rim. But here the disc is mounted directly to the rim, so the spokes can be much lighter (less unsprung weight). The disc has a large surface area and is hugely powerful.

Categories:Cars