KTM 1090 Adventure R Owner's Manual page 206

15 WHEELS, TIRES
204
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Strike each spoke briefly using a screwdriver blade.
Info
The frequency of the sound depends on the spoke
length and spoke diameter.
If spokes of the same length and diameter vibrate with
a different tone, this is an indication that the spoke
tensions differ.
400694-01
You should hear a high note.
» If the spoke tension differs:
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Correct the spoke tension.