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Micro drive is a type of bicycle drivetrain, mostly BMX and MTB, that uses smaller than standard-sized sprockets. [1] The smallest rear sprocket that fits on a freehub body is a 10 or 11-tooth, but with the use of a cassette hub, sometimes called a micro drive rear hub, sprockets as small as 8 teeth may be used.
Cogset: the set of rear sprockets that attaches to the hub on the rear wheel; Cone: holds bearings in place, pressed against the cup; Cotter: pin for attaching cottered cranks; Coupler: to connect tubing together; Crankset or chainset: composed of cranks and at least one chainring
Because sprockets must have a (relatively small) whole number of teeth it is impossible to achieve a perfect progression; for example the seven derailleur sprockets 14-16-18-21-24-28-32 have an average step size of around 15% but with actual steps varying between 12.5% and 16.7%.
By convention, the largest chainring is outboard and the smallest is inboard. Chainrings vary in size from as few as 20 teeth to as many as 60 and potentially more. Chainrings also come in several nominal widths: 3/16″ (4.76 mm) for old-time bikes (especially skip-tooth or inch-pitch), heavy duty BMX, Worksman, and exercise bikes
Freestyle BMX video. In the summer of 1978, Paramount, Lakewood, and other Southern California skateparks began reserving sessions or whole days exclusively for BMX bikes. BMX racer Tinker Juarez was innovating freestyle moves in vert bowls at Lakewood Ca Park, while William "Crazy Lacy" Furmage was innovating freestyle at the Paramount Ca ...
BMX bicycles are available in these types: [1] Dirt – These bikes feature tires with thicker and wider tread for better grip on potentially loose surfaces. Flatland – flatland style BMX bikes have different frame geometry to traditional park BMX bikes because flatland riding requires precise balance on multiple parts of the bike.
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