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rattleCAD is a parametric 2D computer-aided design (CAD) software specific for bicycle design, [1] [2] in particular for design bicycle frame, [3] [4] developed by the Austrian cyclist and programmer Manfred Rosenberger since 2008. [5]
Most bikes have positive trail, though a few, such as the two-mass-skate bicycle and the Python Lowracer, have negative trail. [ 12 ] Trail is often cited as an important determinant of bicycle handling characteristics, [ 13 ] [ 14 ] and is sometimes listed in bicycle manufacturers' geometry data.
Frame Size Calculator - a simple frame size calculator tool; Metallurgy for Cyclists - discusses frame material properties in relation to suitability to frame use; BikeCAD program allows you to design your own frame online. Frame Sketcher Archived 2021-04-27 at the Wayback Machine is a simple HTML5 app which allows to sketch and compare frames ...
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This formula assumes that any hub gear is in direct drive. A further factor is needed for other gears (many online gear calculators have these factors built in for common hub gears). For simplicity, 'gear inches' is normally rounded to the nearest whole number. For example, suppose the drive wheel is actually 26 inches in diameter.
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When braking is increasing the center of mass m may move forward relative to the front wheel, as the rider moves forward relative to the bike, and, if the bike has suspension on the front wheel, the front forks compress under load, changing the bike geometry. This all puts extra load on the front wheel.
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