Schwinn Road Bike
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A racing bike, frequently known as a road bike or an urban cycle, is a bike designed for road cycling according to the guidelines of the Union Cycliste Internationale. The UCI rules were changed in 1934 to exclude recumbent bicycles. The most vital things about a racing bicycle are its light weight and the aerodynamic potency and ergonomics of the rider's position.
To that end racing bicycles may sacrifice comfort for speed. The drop handlebars are positioned lower than the saddle to put the rider in a more aerodynamic posture. The front and back wheels are close together so that the cycle has fast handling. The derailleur gear proportions are closely-spaced so the rider can pedal at their perfect cadence. Bicycles for racing on velodromes are track bicycles ; bicycles for racing off-road are mountain bikes, cyclo-cross bicycles or cycle speedway bicycles ; bicycles that race according to the guidelines of the World Human Powered Auto organisation include faired recumbent bicycles which, on flat ground, are the quickest bicycles in the planet. Recumbent bicycles were excluded from the definition of a bicycle on one Apr 1934. Triathlon bicycles are ruled by World Triathlon Union ( ITU ) rules, which permit more current technological developments than do the UCI rules. The wheels really affect the performance of a racing bike.
The rim of the wheel can be formed for larger aerodynamic potency making a triangular cross-section to form a teardrop with the tire. For hillclimbs, however, energy losses thanks to the higher revolving weight of most aerodynamic edges are larger than the aerodynamic drag reduction that they offer, so a traditional lighter box-sectioned edge is frequently used. For aerodynamics and revolving weight, it is in generally better to reduce the quantity of spokes in the wheel.
For top of the range wheelsets, the spokes can be formed to have a bladed cross-section, further reducing wind resistance. The most typical material for a wheel edge is aluminium amalgamate. Employing a moulded carbon fibre edge decreases weight compared with a metal edge.
Using exotic materials, race-grade wheelsets are really dear. Riders who race frequently decide to own at least 2 pairs of wheels : a heavier, harder, and less expensive wheelsets for coaching, and a lighter, more aerodynamic wheelsets for racing.
To reduce both air resistance and rolling resistance on the road, tires are light-weight, narrow, and have a thin, smooth tread. They are inflated to a high pressure, usually around eight bar ( 820kPa / 120psi ) ; track racing tires can be inflated up to c.14 bar. Till lately, most racing bikes used "tubular / single / sew-up" tires which have no beads : they are stitched round the tube and fixed to the edge. These tires offer an advantage in weight ( lacking the comparatively heavy wire bead ), rolling resistance, grip and pinch flat protection, but their best advantage lies in the power to employ an extraordinarily light-weight straightforward box-section edge, instead of the U-shaped clincher edge. A U-shaped clincher edge must use relatively heavier gauge to stop the tire pressure from spreading the intrinsically feeble U shape and permitting the tire to come off the edge. Advances in tire technology have witnessed the much more practical ( due to larger simplicity of changeability ) clincher ( beaded ) tire close the opening. Some makers create Tubular-Clincher tires, where the tires are sewn round the tubes and have a bead, but there's some debate as to the usefulness of a tubular-clincher tire.
Adherents believe that it has all the benefits of a tubular tire made to fit a clincher edge, but critics disagree the design includes downsides inherent to both systems---the edge weight is still high, the tire is more costly than the standard clincher tire, and correcting a puncture on a tubular clincher is as inconvenient as it is with the standard tubular tire. However, a specific benefit of the tubular-clincher design is that the danger of pinch residences is extremely low ( like the tubular tire ), yet it permits the use of the more preferred clincher wheel. For recreational road cycling, the racing cycle is less well-liked than the sports bike ( aka coaching bike, a touch heavier and less costly version of the road racing bike ), the game / touring bike ( a road-only bike with extra relaxed frame geometry for general recreation and day touring ), or the mountain bicycle.
In their basic entry-level form, trail bicycles, thru mass production and recognition, are less costly than road racing bikes, though this is false for more esoteric dual-suspension models.
An entry-level mountain bicycle starts around half the cost of an entry-level road racing bike. Unless a rider intends riding on coarse tracks, road bicycles including racing bikes are far more efficient for road use.
Cyclo-cross bicycles, which are used for racing on off-road circuits, are nearer to racing bikes than to trail bikes. They have wider, treaded tires and cantilever brakes rather than calliper brakes but are still less efficient than racing bikes to be used on the roads. Cyclo-cross bikes, due to their bigger clearances, can make very dependable and sturdy general use bikes with only limited alteration sometimes simply a change of tires and gearing.