17 – WHEEL TRUING AND REP REP AIR
ABOUT THIS CHAPTER
This chapter is about repairing wheels. It covers truing the wheels (adjusting spokes so that the rim is more round, centered, and wobbles less), replacing broken spokes and damaged nipples, and fixing minor rim damage. The chapter WHEEL BUILDING AND RIM REPLACEMENT is about replacing rims and building new wheels. That chapter does not include anything about truing wheels, but refers back to this chapter for that process. Eyelet: A separate metal reinforcement that goes in the spoke nipple hole in the rim. Cross pattern: The pattern created by two sets of spokes in a hub flange that radiate in opposite directions on their way to the rim. If one clockwise radiating spoke crosses three counterclockwise radiating spokes from the same hub flange, then the wheel is said to be a “three-cross pattern.” Interlace: If a spoke switches from crossing over spokes to crossing under the last spoke it crosses on way to the rim, the switch from crossing over to crossing under is called an interlace. Dish: The centering of the rim to the hub locknuts. Because the flanges of a rear hub may not be equidistant from the locknuts, a rim centered to the locknuts is not necessarily centered to the hub flanges. Viewed from the wheel’s edge, this makes the wheel appear like a dish viewed from its edge. Radial error: This is a deviation in the round of the rim. Radial errors are sometimes called “round errors.” Radial bump: This is a radial error that deviates further from the center of the wheel than the rest of the rim. Radial dip: This is a radial error that deviates closer to the center of the wheel than the rest of the rim. Kgf: Stands for kilograms of force. This is a unit used to measure the tension of a spoke. Reading unit: A number that is read from a spoketension meter. The reading unit must be looked up on a chart specific to the spoke-tension tool being used to convert to kgf.

GENERAL INFORMATION
TERMINOLOGY
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