From an unused root meaning to bind together; combined, i.e. The nave or hub of a wheel (as holding the spokes together) -- spoke.
H2840. chishshur
[חִשּׁוּר] noun [masculine] nave, hub of a wheel (which gather in the spokes) — plural suffix חִשֻּׁרֵיהֶם 1 Kings 7:33.
חשׁשׁ (√ of following; compare Arabic hasten, hurry (transitive), particles of straw, sand, dust, as flying quickly about; see LagBN 40).