Nankang Wintersaf WS-1 245/45 R21 104Q XL, Nordic Compound JD806

External tread pattern employs zig-zag groove and polygonal block design for greater contact patch and improved snow road controllability. Internal tread pattern employs straight groove design for improved straight driving stability while the groove area ratio of 27.5% raises drainage performance. Jagged 3D sipe pattern for better pattern rigidity and ice road handling Grid shape tread pattern increases contact patch and improve initial controllability Tread compound contains hard natural kernal powder for easy cutting into surface of ice road.