The pivoting truck system from Yow is an awesome baseplate which adapt all street trucks. This product allows you to transform your cruiser, skateboard or longboard into a surf skate. Adding this part to your board will provide awesome carving performances and surfing sensations. 2 versions vailable : S4 (turns shorter, more agressive and precise ride / turns, short board surfing oriented) or S5 (more stable and versatile)?