Maxxis MaxxDaddy tyres are available in 1 size: 20.
Staggered, tightly spaced center lugs provide controllable speeds. The knob spacing increases near the shoulder lugs to produce two channels that hook up on hardpack berms to loose dirt on the trails.
Maxxis highlights the next 4 features on their catalog that make this product unique:
Front or rear
Engineered for BMX tracks, trail riding, and dirt jumping
Full Square-knob design