PUSH Industries SV Eight Rear Shock - Standard 210 x 50-55 mm A-Tune 300 - 500 lb/in SpringsPUSH Industries SV Eight Rear Shock Standard 210 x 50 55 mm A Tune 300 500 lb in Springs. SV Eight platform provides a broad tuning base to accommodate a wide range of frame leverages and configurations. SV Eight shocks are available in standard lengths and strokes offering a great option for riders looking for a performance upgrade over their stock air suspension. Each shock build starts with precision components that are assembled with care by