650b inch tires is the go-to tire size for gravel bikes. Similar in size to 27.5 inch tires, 650b is reserved for tires with a width under 2 inches, whereas 27.5 inch is usually reserved for 2 inch and more, which is mountain bike territory.
With the immense popularity of gravel bikes an enormous variety of 650b tires saw the light of day. So besides the standard allround gravel tires, we’ve also covered 650b road tires, slick tires, commuter tires, and even 650b tires in mountain bike disciplines such as, XC, and trail.