Improved ride quality the 17 mm internal rim width increases the air volume the large volume griplink and powerlink tyres increase comfort rolling efficiency and grip zicral spokes and fore drilling improves the lateral stiffness of the wheel low weight and high efficiency through the ism 4d rim machining making for super light rims the zicral spokes and instant drive 360 freewheel system lower overall weight while maintaining stiffness giving you low friction and fast engagement from t