We are looking for a performance shock with much better dampening than what we currently use on our electric motor scooter. Much better dampening.Scooter weight with riders 281 kg. Center to center distance fully expanded 31.5 cmWe want an adjustable spring preload collar at the spring bottom like a good motorcycle shock. Black spring preferred. We want a shock available with several different weights so we can test and adjust.We are looking for a variable rate spring on the shock.Please tell us what information you need to quote pricing or quote.Country:United States