Ask the Experts
Q: "What are the best tires to run on my road bike?"
A: Unfortunately, there is no "one best tire" out there. Each tire manufacturer has its own philosophy on what a great tire should be.
Many tires that are known for being very puncture resistant use a harder rubber compound and Kevlar bands but tend to be less comfortable and absorb little road vibration. Other tires that are known for being supple and great for cornering may use a softer rubber compound that wears out quicker.
When choosing tires, pay attention to the "threads per inch" or TPI used in the fabric that makes up the tire's casing. Fabric with a higher TPI count is thinner and more flexible than low TPI count fabric, so the tire's casing conforms closer to the surface it is being ridden on and absorbs more shock.
High TPI count also means lower rolling resistance. Most of a tire's rolling resistance is caused by the rubber deforming. Because there is less rubber, tires with a higher TPI count convert more of the rider's energy into forward motion. A high TPI count will cost more, but wear longer. Some manufacturers, like Vittoria are known for having extremely high TPI counts in their casing.
Finally, the most important factor in how your tires perform is tire pressure. Contrary to conventional wisdom, more pressure isn't always better. Running too high of a pressure can actually slow you down since the tire is more prone to bouncing and wasting energy as it rolls forward. Too little pressure is equally bad since it saps energy and can cause pinch flats and damage to your rims. Here are two guides for optimal tire pressure: one from Michelin and one from Vittoria.