Streetbox Nx650 88-91 Sb-Ho06-0WkpStreetboxShock features manual preload adjustment and rebound adjustment with 50 clicks. Hyperpro Streetbox! This streetbox contains a replacement progressive front fork spring kit set and an adjustable emulsion shock absorber. Springs and shock provide easier cornering, a shorter braking distance, improved tire life, give a better balance in the bike and better overall feedback of your bike. Shock is built with our modular system, so the shock is