knobbies
Knobbies is a term used to describe small, rounded projections or bumps. The specific context in which the word is used dictates the exact nature of these projections. For instance, in the realm of tires, "knobbies" refers to the large, widely spaced treads on off-road tires. These are designed to provide superior grip on loose surfaces like dirt, mud, or gravel by digging into the terrain. Bicycle tires intended for mountain biking or cyclocross commonly feature knobbies.
In a more general sense, "knobbies" can refer to any object or surface covered in small bumps.