A Bobber is a style of custom motorcycle that took shape in the 1950s and continues to be built today. Bobbers are related to choppers in that they both represent a minimalistic approach where everything is stripped from a bike that is not readily needed. This includes the characteristic rigid frame and shortened ("bobbed") rear fender.
The principal difference between bobbers and choppers is that bobbers are typically built around unmodified frames while chopper frames are often cut and welded into shape. They also often lack most of the chopper's aesthetic characteristics such as chromed parts and elongated forks. Thus, bobbers are fairly easy to create from stock motorcycles and are generally hand built.
In the post-World War II United States, servicemen returning home from the war started removing all parts deemed too big, heavy, ugly or not absolutely essential to the basic function of the motorcycle, such as fenders, turn indicators, and even front brakes. The large, spring-suspended saddles were also removed in order to sit as low as possible on the motorcycle's frame. These machines were lightened to improve performance for dirt-track racing and mud racing.
Forward-mounted foot pegs replaced the standard large 'floorboard' foot rests. Also, the standard larger front tire, headlight and fuel tank were replaced with much smaller ones. Many choppers were painted preferably all in either flat black or in shiny metallic “metal flake” colors. Also common were many chromed parts (either one-off fabricated replacements or manually chromed stock parts). According to the taste and purse of the owner, “chop shops” would build high handle bars, or later “Big Daddy” Roth Wild Child’s designed stretched, narrowed, and raked front forks. Shops also custom built exhaust pipes and many of the “after market kits“ followed in the late 1960s into the 1970s. Laws required (and in many locales still do) a retention fixture for the passenger, so vertical backrests called sissy bars were a popular installation, often sticking up higher than the rider's head.
While the decreased weight and lower seat position improved handling and performance, the main reason to build such a chopper was to show off and provoke others by riding a machine that was stripped and almost nude compared to the softer-styled stock Harley-Davidsons, let alone the oversized automobiles of that time.
The cafe racer is a motorcycle that has been modified for speed and good handling rather than comfort. Cafe racers' bodywork and control layout typically mimicked the style of contemporary Grand Prix roadracers, featuring an elongated fuel tank and small, rearward mounted, humped seat. A signature trait were low, narrow handlebars that provided more precise control at high speeds and allowed the rider to "tuck in" to lessen wind resistance. These are referred to as either "clip-ons" (two-piece bars that bolt directly to each fork tube) or "clubmans" (one piece bars that attach to the stock mounting location but drop down and forward). The ergonomics resulting from low bars and the rearward seat often required "rearsets," or rear-set footrests and foot controls, again typical of racing motorcycles of the era. Distinctive half or full race-style fairings were sometimes mounted to the forks or frame.
The bikes had a raw, utilitarian and stripped-down appearance while the engines were tuned for maximum speed. These motorcycles were lean, light and handled road surfaces well. The most defining machine of its heyday was the homemade Norton Featherbed framed and Triumph Bonneville engined machine called "The Triton". It used the most common and fastest racing engine combined with the best handling frame of its day, the Featherbed frame by Norton Motorcycles. Those with less money could opt for a "Tribsa" - the Triumph engine in a BSA frame.
Mini choppers are scaled-down versions of custom-built motorcycles known as choppers and are generally constructed from 1" steel tubing or 3/4" steel black pipe. The tube or pipe is bent and then welded together to get the desired angles and shapes of the frame, which is usually custom mad
A minibike, also recently known as a mini moto or pocketbike, is a miniature motorcycle. Most traditional minibikes use four stroke engine to turn the rear wheel via a chain. Small cheap gasoline engines like ones produced for yard equipment are most often used, though most designs require a horizontal crankshaft engine. This means that typical walk behind mowers, which use vertical crank engines, cannot be used. Some models use a two stroke engine, and DSCF0813electric-powered models are also available. A 2-stroke engine usually creates a louder, higher frequency noise than a typical four-stroke engine, this is because a two-stroke engine has a power stroke, and subsequent exhaust pulse for every rotation of the crankshaft, while a four-stroke has a power stroke, and an exhaust pulse every other rotation of the crankshaft. In effect, two-strokes sound as if they are operating at double the speed of a four-stroke engine. Also, an improperly tuned two-stroke often releases unburnt fuel, and thick blue smoke out exhaust during normal operation, these features, along with a minibike's small size, mean that minibikes are rarely street-legal but are legal on all grassed non privately owned areas.
A streetfighter is a superbike that is customized by removing the fairing, and making other changes that result in an overall more aggressive look. Made popular by European riders, this type of custom motorcycle is gaining popularity all over the world.
This particular term should not be confused with a street motorcycle or street-use motorcycle, which is a generic term (used by the motorcycle industry) applied to urban street bikes.