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However, in recent years, larger wheel sizes have gained traction, with 29-inch wheels emerging as a popular choice among riders. These larger wheels, with approximately 2.35 inches width, provide enhanced stability and smoother rolling over rough terrain. Additionally, the introduction of 27.5-inch wheels, with approximately 2.25 inches width, offers a middle ground between the agility of 26-inch wheels and the stability of 29-inch wheels, particularly on smaller frame sizes for shorter riders.
The shift towards larger wheel sizes has reshaped the mountain biking landscape, with bikes equipped with 29-inch wheels often referred to as "29ers." Similarly, bikes featuring 27.5-inch wheels are marketed as "27.5 Mountain bikes" or sometimes labeled as "650B bikes" for marketing purposes.
It's important to note that bicycle wheel sizes are not precise measurements. For example, a 29-inch mountain bike wheel may have a bead seat diameter (BSD) of 622 millimeters, while the average tire size for a 29-inch wheel, in ISO notation, is 59-622. This results in an outside diameter of approximately 29.15 inches (740 mm).
In addition to mountain bikes, 24-inch wheels are commonly used for dirt jumping bikes and junior bikes, offering enhanced maneuverability and control. Meanwhile, 622 mm wheels, also known as 700C, are standard on road bikes and are referred to as 28-inch wheels in some countries, particularly in Continental Europe.
The evolution of wheel and tire design reflects ongoing efforts to improve performance, comfort, and versatility in mountain biking. As riders seek bikes tailored to their specific needs and riding styles, manufacturers continue to innovate, offering a diverse range of options to suit various preferences and terrains.