KTM 2011 690 SMC EU Owner's Manual page 99

WHEELS, TIRES
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Briefly strike each spoke with a screwdriver blade.
Info
The frequency of the tone is a function of the spoke length and spoke diameter.
If you hear different tone frequencies from individual spokes of the same length
and thickness, this is an indication of different spoke tensions.
You should hear a high note.
» If the spoke tensions differ:
400694-01
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Correct the spoke tension.
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