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The pedals
rotate about their long axis as the crank rotates about the axis of the
bottom bracket spindle. Cup/cone bearings are used at each end of the pedal
spindle. The outer cone can be adjusted so that there is no 'play' between
the pedal and the spindle and the friction in the bearings is minimized. There
are dust seals at both ends of the pedal to retain lubricant in the pedal
hub and prevent the entry of road dirt. The cup and cone structure of the
pair of bearings allows the shaft to self align so that there is no unwanted
lateral force on the pedal body.
Modern pedals may have sealed bearings
at each end. These cannot be adjusted, but are less prone to contamination
by road dirt during their lifetime. |
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