Escape impending donkey invasions by taking your cobwebbed bicycle out of its dusty nook and bringing it in to Bike Fitters. The bike geniuses know how to make a rust-riddled beater ride as smoothly as a hoverboard, and today's Groupon will get you a full basic bike tune-up. Bike Fitters' skilled mechanics inspect the bike from top to bottom, taking care to note any signs of wear or nests of raccoons. Wheels are adjusted, tire inflation perfected, sticky bits lubed, and brakes primed to optimum efficacy. Following the wheedling, the mechanics also perform a test ride, ensuring optimum safety during the course of all motorless, thigh-powered exploration. Whether you purchased your bike from Bike Fitters or not, they know how to make it a well-oiled, land-cruising machine that will never burst into flames for no reason. See here for Bike Fitters' extensive bike tune-up checklist.