Related Clues:

• It may go flat
• See 64 Across
• Tucker out
• Unicycle need
• It may eventually become bald
• Run out of energy
• Lose energy
• Place for studs
• Many have a spare one in the middle
• Radial, for example
• Retread or radial
• Play out
• Become bored
• Become exhausted
• Need a break