The Monster 821 is equipped with 10-spoke light alloy rims measuring 3.5"" x 17"" on the front and 5.5"" x 17"" at the rear, mounting a Pirelli Diablo RossoTM III 120/70 tyre on the front and 180/55 on the rear. " The rear tyre is dual compound with high percentages of silica providing grip under all conditions, not only on dry surfaces but also on wet, and all of this results in truly sporty handling. The Pirelli Diablo RossoTM III tyres ensure superior, consistent performance over time because their technical characteristics are long lasting and make them enjoyable and fully usable throughout their life.