Bicycle wheel rims meant for use with disc brakes or hub brakes sometimes lack this surface. The Westwood pattern rim was one of the first rim designs, and rod-actuated brakes, which press against the inside surface of the rim were designed for this rim. These rims cannot be used with caliper rim brakes. The cross-section of a rim can have a wide range of geometry, each optimized for particular performance goals. Aerodynamics, mass and inertia, stiffness, durability, tubeless tire compatibility, brake compatibility, and cost are all considerations. If the part of the cross-section of the rim is hollow where the spokes attached,
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