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Trail decreases as head angle increases (becomes steeper), as fork offset increases, or as wheel diameter decreases. Motorcyclists tend to speak of trail in relation to rake angle. The larger the rake angle, the larger the trail. Note that, on a bicycle, as rake angle increases, head angle decreases. Trail can vary as the bike leans or steers.
A 90° head angle would be vertical. Some examples of caster angles are: [5] 72.5° to 74° on the track bicycle 2007 Lemond Filmore, designed for the track (angle varies depending on frame size) 71.25° to 74° on the road bicycle 2006 Lemond Tete de Course, designed for road racing (angle varies depending on frame size)
Traditional bicycle head tubes and headsets are sized for a 25.4 mm (1 in) diameter steerer tube (also known as the fork column). Many frame and fork manufacturers are now building their parts around a steerer tube with a diameter of 28.6 mm (1 + 1 ⁄ 8 in). The larger diameter of the head tube and headset gives added stiffness to the steering ...
touring bicycles with head angles between 72° and 73° and trail between 43 mm and 60 mm; racing bicycles with head angles between 73° and 74° and trail between 28 mm and 45 mm; track bicycles with head angles of 75° and trail between 23.5 mm and 37 mm. However, these ranges are not hard and fast.
Too much trail makes a bicycle feel difficult to turn. Road racing bicycle forks have an offset of 40–55 mm. [2] For touring bicycles and other designs, the frame's head angle and wheel size must be taken into account when determining offset, and there is a narrow range of acceptable offsets to give good handling characteristics. The general ...
A variation on this type of bicycle is the sports roadster (also known as the "light roadster"), which typically has a lighter frame, and a slightly steeper seat-tube and head-tube angle of about 70°–72°, fitted with cable brakes, comfortable "flat" North Road handlebars, mudguards and, as often as not, three, four or five-speed internal ...
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The 'diamond' frame's central, horizontal top bar forces the rider to swing a leg over the bicycle's seat. A Triumph step-through, ladies', or open frame Dursley Pedersen bicycle circa 1910 A penny-farthing photographed in the Škoda Auto Museum in the Czech Republic A Brompton folding bicycle Bicycle in Victorian Plymouth, England, with a predecessor of the Starley diamond-frame A cantilever ...