The benefits of riding a bike are threefold, supplying cyclists with exercise, a low carbon footprint, and wind to lift the feathered layers of their glam-rock wig. Keep your multipurpose machine in shape with today's Groupon: for $35, you get a classic bike tune-up at Giant Cycling World in Littleton (a $75 value).

Giant Cycling World’s knowledgeable staffers use their experience and passion for cycling to outfit road warriors with maintenance services and a stock of accessories, clothing, and bikes. The classic tune-up tends to two-wheeled friends with a full adjustment of derailleurs, brakes, bearings, and sassy attitude. A truing of the wheels ensures proper alignment and position, and a torque wrench tightens loose bolts. Technicians also clean bike frames, removing stray gnomes picked up from the last enchanted-forest excursion; lubricate all points in need of a greasing; and pump up tires for safer riding and cushioned landings. Inside the shop, a bevy of cycles for all ages and terrains beckons bikers to take a ride as helmets rest on shelves awaiting the perfect head to protect. Bright blue and green posters alternate between inspirational biking quotes along clean white walls where accessories hang.