jockey wheel การใช้

• The rear derailleur also has spring-mounted jockey wheels which take up any slack in the chain.
• Between the first bogie and the idler wheel, was a larger diameter vertically sprung " jockey wheel ".
• In order to conserve carrier deck space, a unique " kneeling " nose undercarriage along with a swivelling " jockey wheel " allowed the FJ-1 to be stacked tail-high, close to another FJ-1.