Cone wrenches . These special flat wrenches allow you to adjust and overhaul hubs. The 13mm size doubles as a caliper centering tool in many brakesets. Pay extra to get Campagnolo, Park, or Bicycle Research, because cheap cone wrenches don't last. Use the 17mm wrench from the box or open end set for the occasional French locknut.
Floor pump with gauge .
Underinflated tires perform poorly, wear quickly, and contribute to rim damage. A high-pressure pump with a built in gauge eliminates guesswork.