Like centipedes or the judicial system, a bicycle relies on the synchronicity of its many parts. Maintain a uniformly moving bike with today's Groupon: for $30, you get a silver-level tune-up (a $59.99 value) and $10 toward café fare at Trailhead Bike Cafe (a $69.99 total value).

Trailhead Bike Cafe's certified team of technicians fixes up two wheelers with tune-ups and refuels humans with café fare. The staff tenderly pampers velocipedes with the silver-level tune-up, which improves performance and safety by adjusting brakes and front and rear derailleurs. The gear gurus also true wheels, inflate tires, and lube and wash chassis, leaving bikes ready to cruise with the smooth grace of a freshly groomed groom flitting down a water slide in his tuxedo. In the shop's amply stocked café, cyclists can savor energizing yogurt and granola ($2.99) or hearty salads and sandwiches ($3.99+)―including the Trailhead Reuben ($7.99)―while emailing envious automobiles over Trailhead's free WiFi or taking the time to write out an old-fashioned fax.