We all make compromises while cycling. We have to balance our desire to travel as light as possible with our fear of being stuck on a country road 30 miles away from home with a broken bike. For me, the Topeak Mini 9 Pro Multitool is the perfect of combination of weight and size for my road bikes.
The Topeak Mini 9 Pro Multitool is incredably small (2.6 x 1.2 x 0.8 in), yet has all the Allen wrenches I need for my Trek road bikes (2, 2.5, 3, 4, 5, 6 mm, all of hardened steel). This multitool also includes two tire levers (one plastic, one hardened steel) and a #2 Phillips screwdriver. The body of the Mini 9 is made of a high-strength forged alloy. All of this fits in the included neoprene case and weighs only 2.57 ounces (73g).
The Topeak Mini 9 Pro Multitool retails for $22.00, but is available on Amazon.com for under $17.00. This tool is available in three colors (gold, silver, and black). Topeak offers a 2-year warranty on all mechanical components against manufacturer defects.