Narrow tires roll with less resistance, are more efficient to pedal and are often considered to dig or provide a deeper purchase when used on the rear wheel. Wider tires supply more stability, better traction and a larger platform or riding surface in contact with the terrain. Based on what type of mountain biking you'll be doing, tire selection is an important consideration for your performance and enjoyment of your riding.
Narrow Tire Efficiency
Narrow tires fall somewhere in the 1.8 to 2.2 inch range of tire width. Depending on your cycling habits, these tires are generally efficient and acceptable for most mountain biking needs. They roll fairly well on hard surfaces like hard dirt and even pavement, and still provide excellent traction on loose variable terrain like conditions encountered on trails. These tires will need to be inflated to a high pressure to protect the rim, often resulting in a hard ride and the likelihood of slipping on corners while turning sharply.
Race Proven
Narrow tires are a standard choice by cross-country racers due to their lightweight and efficient rolling ability. Some racers may choose to run a slightly wider tire on the front wheel to provide steering and aggressive navigation through technical sections, while running a narrow tire in the rear for climbing and pedaling traction. According to REI.com, racers normally use tires less than 2 inches in width, while other riders use tires in the 2 to 2.4 inch range for versatility.
Wide Tire Stability
Generally around 2.2 inches and up to and beyond 2 1/2 inches, wider tires provide a solid feel and stable riding platform. Because of their size, they can be run with lower tire pressure, further enhancing their traction and ability to corner. They maintain contact with the riding surface and allow a supple ride that is comfortable and less jarring than harder, high pressure tires. A wider tire will result in more shock absorption, according to Sheldonbrown.com.
Progressive Riding
Wider tires have a niche in downhill racing and free riding, both aggressive mountain biking. These riding styles require equipment that over compensates for the abuse that riders put on their bikes. With the current markets moving away from cross-country racing and more toward comfortable "all-mountain" riding, wide tires are accepted now more than in the past.
Best of Both Worlds
Many trail mountain bike enthusiasts prefer efficient rolling tires but enjoy the softer, less abrasive rides that wider tires deliver. Since mountain bikes are often used on a variety of surfaces like streets, grass, gravel roads and rocky trails, it's wise to find a tire that can handle all of these conditions. Recent marketing trends are leading more and more to wider tires with smaller tread designs. These tires fall somewhere in between narrow and fat, slow and efficient. Many recreational riders borrow tricks from racers, like running a narrower tire in the rear and a wider tire up front.
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