side soft % is what tipped me to roadsmarts
RII
In the CENTRAL AREA (75% of total surface)
the high silica content compound, blended with a reactive polymer provides a BALANCED performance to offer Wet Grip, Stability and Mileage
In the SHOULDER AREA (25% of surface)
the fine carbon-black and resins compound provides the SPORT performance for Dry Grip at high lean angles