I just got off the phone with Progressive Suspension. I talked to the Tech and asked him which rear shocks they recommend for the CTX1300. He said they didn't have anything to offer for these bikes. I told him that I had read on our site that some people had brought their bikes to their shop and had both the front suspension and the rear shocks replaced. He said that very well might be but they don't have a product that they can recommend for these bikes. Very strange. I quess I will keep looking for a better rear shock.