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The early wheels were spoked, made of all metal, or wood and metal, and used inner tubes to hold air. [6] Flats were a constant problem; largely the fault of poor roads and not necessarily tyres. [6] For easier repair, butt-ended or open ended inner tubes were used on some models, and some brands made rear wheels easier to detach. [6]
A motorcycle fork is the portion of a motorcycle that holds the front wheel and allows one to steer. For handling, the front fork is the most critical part of a motorcycle. The combination of rake and trail determines how stable the motorcycle is. The 'fork' on a motorcycle consists of multiple components.
An inner tube is an inflatable torus that forms the interior of some pneumatic tires. [1] The tube is inflated through a valve stem and fits inside the tire casing. The inflated inner tube provides structural support and suspension, while the outer tire offers grip and protects the more fragile tube.
The family-run company Harris Performance Products is based in Hertford and designs, develops, manufactures and markets road and racing motorcycle chassis and components. The company was established in 1972 by Lester and Steve Harris, with a third director Stephen Bayford.
Whilst spoked wheels offered a degree of flexibility to help absorb road imperfections, they also required periodic maintenance to ensure correct spoke tension and required the fitment of an inner tube. Honda claimed the Comstar design combined the strength of a cast wheel but allowed a predetermined level of radial flex like spoked wheels.
Motorcycle wheels are made to cope with radial and axial forces. They also provide a way of mounting other critical components such as the brakes, final drive and suspension. Wheels, and anything directly connected to them, are considered to be unsprung mass. Traditionally motorcycles used wire-spoked wheels with inner tubes and pneumatic tyres.