An accomplished endurance athlete, he twice completed a 100-mile running race through winding trails in the Sierra Nevada mountains.
New York Times
(Dec 19, 2011)
hydraulic brake in which friction is applied to both sides of a spinning disk by the brake pads
Disc brakes are one of the biggest improvements to off-road biking, with their ability to apply variable force from a trickle to tossing you over the handlebars - even after you've fully submerged them under a stream.
a light strong grey lustrous corrosion-resistant metallic element used in strong lightweight alloys (as for airplane parts); the main sources are rutile and ilmenite