Use
A spoke wrench is used during the creation, maintenance, or repair of spoked wheels to adjust the tension of the spokes. The goal common to these activities is to bring the wheel (nearer) to a state of true — namely, a wheel in which the rim is 1) a perfect circle concentric with the axis of the axle in the hub, and 2) planar, such that the plane of the rim is centered laterally between the two extremes of the axle where it is supported in a frame. Additionally it is to make the spoke tension as close to the same on all spokes on the same side of the wheel.
By increasing or decreasing the tension of individual spokes, or groups of spokes, around the circumference, a wheelsmith can correct for local deviations from true - e.g. wobbles, or hops.
Read more about this topic: Spoke Wrench
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