Rr Shock Spr Norden 901 22-23 Sp-Hu09-Ssb001BShock SpringProgressive rear spring is designed to smoothly transfer engine power to the road whilst controlling your bike, ensuring more stability and will significantly reduce tire wear Shorter braking distance Better balance in the bike, more comfortable riding, even with passenger Easy cornering More grip in dry and wet weather More confidence, it makes you feel more comfortable and or faster Overall sense of confidence in the bike