- traila path or trackAn 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)
- trailheadthe beginning of a trailWarning signs are posted at the trailhead and along the trail.Washington Post (Sep 2, 2011)
- disc brakehydraulic brake in which friction is applied to both sides of a spinning disk by the brake padsDisc 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.
- endurancethe power to withstand hardship or stressMitochondria are the energy powerhouses of cells, so more mitochondria mean better endurance and fitness.New York Times (Dec 10, 2014)
- rootunderground plant organ that lacks buds or leaves or nodes
- rolloverthe act of changing the institution that invests your pension plan without incurring a tax penaltyIn biking rollovers are the process of hopping smoothly over fallen trees using timely front-to-back unweighting, hopping and carefully-chosen speed.
- rock gardena garden featuring rocks; usually alpine plants
- berma narrow ledge at the top or bottom of a slope
- bridgestructure allowing passage across a river or other obstacle
- aluminuma silvery ductile metallic element
- titaniuma light strong grey lustrous corrosion-resistant metallic element used in strong lightweight alloys (as for airplane parts); the main sources are rutile and ilmenite
- carbonan abundant nonmetallic element in all organic compounds
- knobbyhaving knobs
- downhillthe downward slope of a hill
- cross countrya long race run over open country
- technicalof or relating to aptitude in a practical skill
- gnarlyrough and misshapen and full of knots
- cogtooth on the rim of gear wheel
- suspensiona mechanical system of springs or shock absorbers