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A log pile Log pile A TTF (technical trail feature) which consists of a pile of logs designed to be ridden over as a "challenge" or "test" of a rider's skill. [51] Log ride A TTF (technical trail feature) which consists of a log designed to be ridden over along its length as a "challenge" or "test" of a rider's skill. [51] Limit
Shaft drives were introduced in the 1880s, but were mostly supplanted by chain-driven bicycles due to the gear ranges possible with sprockets and derailleurs. Around the 2000s, due to advancements in internal gear technology, a small number of modern shaft-driven bicycles have been introduced.
Augercast piles are not generally suited for use in contaminated soils, because of expensive waste disposal costs. In cases such as these, a displacement pile (like Olivier piles) may provide the cost efficiency of an augercast pile and minimal environmental impact. In ground containing obstructions or cobbles and boulders, augercast piles are ...
Disadvantages include: Implementations to date are heavier than those of bicycle chain and sprocket designs.; Though some of the components in a sealed hydraulic system maintain constant efficiency upwards of 95% in all conditions (see hydristor), the overall losses usually result in an efficiency of about 75% (power loss of about 25%, see hydraulic machinery).
Reducing the weight of the bike + rider by 1 kg would increase speed by 0.01 m/s at 9 m/s on the flat (5 seconds in a 32 km/h (20 mph), 40-kilometre (25 mile) time trial). The same reduction on a 7% grade would be worth 0.04 m/s (90 kg bike + rider) to 0.07 m/s (65 kg bike + rider).
One standard option for the Brompton folding bicycle is to use a 3-speed hub gear (roughly a 30% difference between gear ratios) in combination with a 2-speed derailleur gear (roughly a 15% difference) to give 6 distinct gear ratios; this is an example of half-step gearing. Some Brompton suppliers offer a 2-speed chainring 'Mountain Drive' as ...
An all-terrain vehicle (ATV), also known as a light utility vehicle (LUV), [1] a quad bike or quad (if it has four wheels), as defined by the American National Standards Institute (ANSI), is a vehicle that travels on low-pressure tires, has a seat that is straddled by the operator, and has handlebars, similar to a motorcycle. As the name ...
The engine drove a belt turning a large gear wheel attached to the opposite side of the rear wheel as the chain. By 1901 the kit engine was a 211 cc (12.9 cu in) unit developing 1.5 hp (1.1 kW; 1.5 PS), comfortably cruising at 30 km/h (19 mph) at 1,500 rpm, capable of a top speed of 50 km/h (31 mph), and getting fuel consumption in the range of ...