SpokeLengthCalculator is a Mac OS X app that calculates spoke lengths for wire spoked wheels. Preset is Campagnolo Record front hub and Mavic Open Pro rim. All measures are in mm (millimeters). What info do you need for calculate spoke lengths ? Number of Spokes, Effective rim diameter (ERD), Flange width to center, Flange diameter, OLD, Spoke hole diameter, Crossings to use. As we say in swedish, "Om din bokf?ring av data ?r r?tt, ?r resultatet din l?n" In English, do not estimate values, it will result in wrong spoke lengths