First Aid Kit

Topeak: Alien

High Quality Bike PUMP
(I highly recommend the
Topeak: Combo Master Blaster
or the Zefal hpX Frame Pump)

Cell Phone or $5 (in quarters)
or a phonecard

Whistle (very useful, trust me!)

TRL Tools

Small Philips & Common Screwdriver

Medium Philips & Common Screwdriver

Small Pliers or Needle Nose Pliers

Cable Cutters

Adjustable Wrench

One Set Allen Wrenches

Chain Tool (use the appropriate Tool for Your Bike)

Pocket Knife

Universal Spoke Wrench

Presta to Schrader Valve Adapter

Spare Tire (foldable)

Spare Cleat Bolts: SPD & Look

Spare Braze on Bolts

Spare Bolts for Axles without Quick Release Skewers

Replacement chain links or pin(s)
Shimano & Campy
(the Two Are Not Interchangeable)

Electric Tape

Rim Liner Tape (Mountain Bike)

Rim Liner Tape (Road/Hybrid Bike)

Shoe String

Raising or Lowering Seats

Adjusting Seat Angles, Handle Bars, Brake Levers, Brake pads, Derailers, and Derailer Shifters

Loose forks

Miss Aligned Handlebars

Straighten Warped (tacoed) Rims

Broken Chain Links

Broken Spokes

Flat Tires

Worn Tire Beads

Tires With Holes

Frayed (Broken) Brake/Derailer Cables

Broken Derailers

Bent Derailer Hangers

Loose Bottle cages

Cracked or Broken Frames

Broken/Bent Presta Valves

Loose Presta/Schrader Valves

Misc. Broken Equipment