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K'NEX Hub/Pulley Small Grey
Ref: 90978G (or 90978)
Age: 7+
Weight (approx.) 4.12g
Available: only 12170
37mm (1.5 inch) diameter approx. Can either be used as a pulley, driving string or a rubber band, or as a hub fitted with the 91975 Tyre Small to make a tyred wheel.
More Classic K'NEX Wheels:
Website last updated 2 October 2024. Feedback 
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Extra search words: KNEX wheel, KNEX tyre, K'NEX wiel, KNEX wiel