Much like robots, children, and robotic children, bikes need to be regularly recalibrated to keep them from developing human emotions. Keep your bike performing at its functional, unfeeling best with today's Groupon: for $40, you get a professional bike tune-up (a $83.97 value) at Hardcore Bikes, located on 82nd Avenue.

Hardcore Bikes’ team of expert road warriors is adept at repairing any manner and make of two-wheeled chariot, from pragmatic city commuters to high-end road and mountain bikes. Known as a technical bike shop, Hardcore Bikes employs head mechanics schooled in the Barnett system of bicycle repair, which emphasizes carefully measured adjustments, as opposed to repairing by feel, which can result in improper service. During a professional tune-up, shifting, braking, and missile-deploying systems enjoy a full inspection and adjustment. A bicycle whisperer then restores wheels to proper alignment and checks to ensure spokes are in the right range. The hubs, headset, and bottom bracket, notorious attention seekers that they are, get an ego boost from thorough inspection. Finally, the mechanic inflates tires to the correct pressure and performs a safety check of all fasteners and cables.

No one tool works on every bicycle, as each one sprouts from its seed pod with natural irregularities, and to remedy this, Hardcore Bikes carries specialty tools for work on certain bike brands. The store is open Tuesday–Saturday, starting at 10 a.m.