Before wintertime hibernation, bicycles forage and fill their inner tubes with enough sustenance to feed training-wheeled cubs come spring, a noble act that often leads to serious exhaustion. Help spin the spokes of life with today's Groupon: for $25, you get $50 worth of products and services at Grand River Cycle in Cambridge.

The bicycle buffs at Grand River Cycle are on a mission to equip every man, woman, and upright aardvark with a bicycle, and to share and educate on the joys of self-generated propulsion. Their store welcomes budding cyclists into an open and inviting atmosphere stocked with a complete line of cycling accessories from basic upgrade and repair parts to cycling-specific clothing and nutrition products. Track miles between peanut-brittle breaks with a Bontrager trip monitor ($39.99), or protect your brain bucket with a safe yet stylish helmet ($44.99). Stave off the cold with Louis Garneau ear cover ($19.99) or cloak your trunk in atmos 2 vest ($49.99).

Bicycle owners can opt for a basic tune-up (starting at $59.99), or make a dent in the purchase of one of their brand-name Giant, Trek, or Mirraco bikes (starting at $399.99) as well as specialty rides like hardtails, 29ers, jumpers, and BMXers. Grand River's staff will oversee a proper fitting of the bike, mending handlebars grip and cuff-lengths, and all rides include a two-year maintenance plan (failed fiery river crashes not included).