Bomboloni is your choice for fast rolling, multi-condition performance, on plus and fat bikes. Italian for donut, bomboloni delivers the sweet traction you expect, without the guilt of the slower rolling competitors. With its square-step ramps and share squared edge it cuts for grip in compressed surfaces without losing its fast rolling ability. Alternating sipe angles provide tactile grip on slippery surfaces, such as rocks, roots, and pavement. With a world championship proven tnt bead, dual compound, sidewall protection, and premium 120 tpi casing, the bomboloni is sure to satisfy. Now you can have your cake, and eat it too fast rolling, multi-condition performance square-step ramps for fast rolling on dirt, also provide bite in packed snow fully siped blocks provide surface area for grip on rocks and roots tech specs and features dual compound tnt tube no-tube tubeless ready folding bead 120 tpi nylon casing 905 grams 27.5 X 3. 00in - 1020 grams 29 x 3. 00in - 1525 grams 26 x 4. 00in brand: vittoria.