K'NEX Hub Narrow 50mm Grey
Weight (approx.) 4.4g
Available: Limit of 128
Hub diameter approx. 50mm (2in.)
A single one of these hubs can be fitted into a Tyre Narrow Black to form a narrow tyred wheel.
Or, alternatively, two of these hubs may be fitted into a single Tyre Racing wheel 50mm, to make a wide tyred wheel.