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True, truing
From WikiPedalia
A "true" wheel is one in which the rim is perfectly concentric and runs along a plane perpendicular to the axle.
A wheel which is "out of true" vertically will be out of round, and will give a bumpy ride even on a smooth road. If it has splayed sidewalls, it will also cause pulsation of a rim brake.
A wheel which is "out of true" horizontally may rub on the brake shoes at part of its revolution, causing excessive drag...or causing the brake to be adjusted looser than it should be to prevent this drag.
"Truing" is the act of making a wheel run true. This procedure is described in my Wheelbuilding Article.
