Wheel core nowheel diameter 51mmwheel width 30mmwheel hardness 83bwheel formula stfwheel color whitewheel suggested use streetwheel surface treadedwheel shape v5about street tech formula stfstreet tech formula stf is specifically engineered from top quality components to obtain all the best properties necessary for the ultimate in street wheel performancebones wheels has created a wheel with a substantially higher rebound for more speed and amazing slide capabilities while maintain