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Ebonite is a brand name for a material generically known as hard rubber or vulcanite, obtained via vulcanizing natural rubber for prolonged periods. Ebonite may contain from 25% to 80% sulfur and linseed oil. [1] [2] Its name comes from its intended use as an artificial substitute for ebony wood.
The first bicycle "tires" were iron bands on the wooden wheels of velocipedes. [3] These were followed by solid rubber tires on penny-farthings. [4] The first patent for "rubberized wheels" was granted to Clément Ader in 1868. [5] In an attempt to soften the ride, rubber tires with a hollow core were also tried. [6]
The tread is a thick rubber, or rubber/composite compound formulated to provide an appropriate level of traction that does not wear away too quickly. [ 71 ] The tread pattern is characterized by a system of circumferential grooves, lateral sipes, and slots for road tires [ 26 ] or a system of lugs and voids for tires designed for soft terrain ...
One particular model, made by Pope Manufacturing Company in 1886, weighs 36 pounds (16 kg), has a 60-spoke 53-inch (130 cm) front wheel and a 20-spoke 18-inch (46 cm) rear wheel. It is fitted with solid rubber tires. The rims, frame, fork, and handlebars are made from hollow, steel tubing. The steel axles are mounted in adjustable ball bearings ...
Wheels with Asanti 28 in (710 mm) rims on a police Hummer H2 car. The wheel size is the size designation of a wheel given by its diameter, width, and offset. The diameter of the wheel is the diameter of the cylindrical surface on which the tire bead rides. The width is the inside distance between the bead seat faces.
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