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Threshold braking or limit braking is a driving technique most commonly used not only in motor racing, but also practiced in road vehicles to slow a vehicle at the maximum rate using the brakes. [1] The technique involves the driver controlling the brake pedal (or lever) pressure to maximize the braking force developed by the tires .
The fitness and cadence of the rider, bicycle tire pressure and sizes, gear ratios, slope of the terrain affect the overall speed of the rider. A person pedalling with 100 W power can achieve 5.5 m/s on a roadster, 7.5 m/s on a racing bicycle, 10 m/s with a faired HPV and 14 m/s with an ultimate HPV.
In cycling, cadence is a measure of rotational speed of the crank, expressed in units of revolutions per minute (r/min or rpm). In other words, it is the pedalling rate at which a cyclist is turning the pedals. Cadence is directly proportional to wheel speed, but is a distinct measurement and changes
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The latter is an expert driving technique that is even more difficult to learn than cadence braking, and again has been largely superseded by ABS. Threshold braking, or a good ABS, generally results in the shortest stopping distance in a straight line. ABS, cadence and interference braking are intended to preserve steering control while braking.
Braking distance refers to the distance a vehicle will travel from the point when its brakes are fully applied to when it comes to a complete stop. It is primarily affected by the original speed of the vehicle and the coefficient of friction between the tires and the road surface, [Note 1] and negligibly by the tires' rolling resistance and vehicle's air drag.
Bicycle gearing is the aspect of a bicycle drivetrain that determines the relation between the cadence, the rate at which the rider pedals, and the rate at which the drive wheel turns. On some bicycles there is only one gear and, therefore, the gear ratio is fixed , but most modern bicycles have multiple gears and thus multiple gear ratios.
A drag brake is intended to provide a constant decelerating force to slow a bicycle on a long downhill rather than to stop it; a separate braking system is used to stop the bicycle. A drag brake is often employed on a heavy bicycle such as a tandem in mountainous areas where extended use of rim brakes could cause a rim to become hot enough to ...