A bicycle that isn't properly maintained will act out by deflating its tires, incessantly ringing its bell to the tune of "La Cucaracha," and transforming its banana seat into an actual banana. Prevent mushy metamorphosis with today's Groupon: for $25, you get a basic-service bicycle tune-up at Macomb Bike, located on Schoenherr Road in Warren (a $49.99 value).

The radial-savvy staff at Macomb Bike keeps the Detroit area pedaling by offering bicycles off all types and brands as well as full repair services to heal ailing two-wheelers. With this deal, you get the basic-service tune-up, which grooms the gears of any exhausted road steed and adjusts the front and rear brakes. Macomb Bike checks tire pressure to make sure riders won't experience a flat tire in the middle of biking on the field of a Detroit Lions game, and also lubricates and checks chains. Macomb Bike encourages all road warriors must call ahead to make an appointment. Parts and additional labor are not covered by this deal. The basic service tune-up is free for owners of bicycles purchased from Macomb Bikes.