Mitas framdäck MITAS 90/90-21 TERRA FORCE Motocross tires for varied conditions, from soft to medium. These feature a tapered knob design that chisels its way through the soft ground to get traction. The high well-spaced knobs are tied at the base to be reinforced for a longer life. The front and rear tires are designed in a similar way but with differences that work well together. The high well-spaced knobs are tied at the base to be reinforced for longer life.