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Pneumatic trail or trail of the tire is a trail-like effect generated by compliant tires rolling on a hard surface and subject to side loads, as in a turn. More technically, it is the distance that the resultant force of side-slip occurs behind the geometric center of the contact patch .
Traditional wired-on rims were straight-sided. Various "hook" (also called "crochet") designs re-emerged in the 1970s to seat the tire bead on the wheel rim and hold the tire in place, [10] [11] resulting in the modern clincher design. This allows higher (80–150 psi or 6–10 bar) air pressures than was possible older wired-on tires.
Larger wheels roll over obstacles more easily. The ability of a wheel to roll over obstacles is proportional to its size. A 29″ wheel, which is about 10% larger than a 26″ wheel, can roll over 10% larger obstacles. [citation needed] The larger diameter wheels have more angular momentum so they lose less speed to obstacles and rough sections.
To take a common example, 195/55R16 would mean that the nominal width of the tire is approximately 195 mm at the widest point, the height of the side-wall of the tire is 55% of the width (107 mm in this example) and that the tire fits 16-inch-diameter (410 mm) rims. The code gives a direct calculation of the theoretical diameter of the tire.
In April 1968, Wheel Horse entered the snowmobile market by purchasing the Sno-Flite snowmobile line of CE Erickson of Des Moines, Iowa. [4] [5] Six-models called "Safari" ranged from 295 to 440 cc producing 18 hp (13.4 kW) to 30 hp (22.4 kW) with an optional electric start system, and were priced from $845 to $1,195. [4]
The Uniroyal Giant Tire was created by the United States Rubber Company for the 1964 New York World's Fair, where it functioned as a Ferris wheel. Since 1966 it has been a static display alongside Interstate 94 in Allen Park, Michigan , United States between the Southfield Freeway interchange and Outer Drive overpass.