The Pirelli MT 21 RALLYCROSS R 120/90R17 64R is a motorcycle tyre conceived for rallycross and mixed‑surface off‑road competition use. It is aimed at riders who require aggressive traction on loose, muddy and variable terrain while retaining predictable behaviour on hardpack sections. This tyre belongs to the off‑road competition segment and is optimised for fast directional changes and traction transitions.

The tread arrangement features pronounced knobs and open channels that promote rapid self‑cleaning and efficient water evacuation in muddy conditions. The construction provides a focused contact patch for strong braking performance and reliable cornering stability when leaning and transferring loads. The compound is chosen to balance grip against wear across a range of temperatures. Cornering stability is achieved through reinforced carcass geometry and strategic knob placement.

Riders gain precise steering response and strong acceleration traction on loose surfaces, together with durable performance over mixed stages. The MT 21 delivers competitive grip and control for rallycross demands.