Bicycle wheel To accomplish this, wheel designs are employing lighter rim materials, moving the spoke nipples to the hub or using lighter nipples such as aluminum. Note however that rotational inertia is a factor only during acceleration (and deceleration/braking). At constant speed, aerodynamics are a significant factor. For climbing, total mass remains important. See Bicycle performance for more detail. The hub flanges of modern tension-spoked bicycle wheels are always spaced wider than where the spokes attach to the rim. When viewed in cross section, the spokes and hub form a triangle, a structure that is stiff both vertically and laterally. In three
Ship's wheel (though sometimes as few as six or as many as ten) shaped like balusters and all joined at a central wooden hub or "nave" (sometimes covered with a brass "nave plate") which housed the axle. The square hole at the centre of the hub through which the axle ran is called the "drive square" and was often lined with a brass plate (and therefore called a "brass boss", though this term was used more often to refer to a brass hub and nave plate) which was frequently etched with the name of the wheel's manufacturer. The outer rim is composed