【實用冒險app】Downhill Mountain Biking|最夯免費app-gigacircle

The 1st downhill time-trial race took place in Fairfax, California on October 21, 1976 on a fireroad now referred to as Repack Road due to the need to repack the hub brake after a descent. The bikes used were based on cruiser bicycles that had Drum brake or a single rear coaster brake that worked by pedalling backwards. A mechanism came into operation causing a conical metal (bronze?) brake shoe to be wound on a thread into a conical metal hub. To prevent a metal to metal brake from snatching it was always filled with grease. Heavy use of the brake during the descent would cause the brake to over heat, melting the grease till it drained from the hub and required repacking. Ten riders descended 1,300 feet (400 m) of Repack in about 5 minutes.

The first bikes used for descending were known as "klunkers" or "paperboy bikes": cruisers using balloon tires and coaster brakes, a sturdy bicycle, designed by Ignatz Schwinn in the depths of the Great Depression, that could endure abuse that could damage other bicycles, by adapting features from the Henderson and Excelsior motorcycles his company had built during the 1920s, including a heavy "cantilevered" frame with two top tubes and 2.125-inch-wide (54.0 mm) "balloon" tires from Germany. Innovations like the fat-tire Schwinn with derailleur gears by Russ Mahon of The Morrow Dirt Club in Cupertino at the 1974 Marin County cyclo-cross and Gary Fisher's 1975 use of a tandem rear hub (from a flea market) with internal steel drum brake and threaded for a freewheel derailleur cluster developed the sport and by 1979, two organizers and competitors of the Repack downhill, Charlie Kelly and Gary Fisher founded the company which named the sport, MountainBikes.[8] As mountain biking grew enormously during the 80s, downhill riders continued to use either rigid or limited suspension travel (under 2 inches (5 cm)) bicycles, and purpose made downhill bikes were not made until the 90s. Some of these innovations included dual crown suspension forks and disc brakes, as well as very elaborate frame suspension designs.

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Game features:

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