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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 ...
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.
A bike throw occurs in the final moments of a bike race, usually within the last few feet. A sprint is involved, and at the end of the sprint, the rider pushes their arms forward, stretches their back out, and attempts to move their bike as far forward as possible, getting to the finish line before their competitors. [21] Blocking
From a mechanical viewpoint, up to 99% of the mechanical energy delivered by the rider into the pedals is transmitted to the wheels (clean, lubricated new chain at 400 W), although the use of gearing mechanisms reduces this by 1–7% (clean, well-lubricated derailleurs and a straight chainline), 4–12% (chain with 3-speed hubs), or 10–20% (shaft drive with 3-speed hubs).
It can also be a challenge for touring bikes that carry a heavy load of gear over or even behind the rear wheel. [37] Mass over the rear wheel can be more easily controlled if it is lower than mass over the front wheel. [11] A bike is also an example of an inverted pendulum.
Hunting oscillation is a self-oscillation, usually unwanted, about an equilibrium. [1] The expression came into use in the 19th century and describes how a system "hunts" for equilibrium. [ 1 ] The expression is used to describe phenomena in such diverse fields as electronics, aviation, biology, and railway engineering.
Folding bikes generally come with a wider range of adjustments for accommodating various riders than do conventional bikes, because folding bike frames are usually only made in one size. However, seatposts and handlebar stems on folders extend as much as four times higher than conventional bikes, and still longer after-market posts and stems ...
A bike shop or bicycle shop is a business specializing in bicycle sale, maintenance and parts. Bike shops may be small businesses , chain , mail-order or online vendors. Local bike shops (sometimes abbreviated LBS [ 3 ] ) are a key component of the bicycle industry and, in recognition of the value that local bike shops provide, some ...