Related Clues:

• Get knocked out
• Ring to ride on
• Cotter pin's place
• It's worn on a road trip
• It may go flat
• Hub connection
• Hot-rod rod
• See 64 Across
• Wheel bar
• Bar between wheels
• Tucker out
• Wagon-wheel attachment
• Toll unit on a toll road
• Influential one, informally
• Unicycle need