14” dual adjustable shocks 150# springs on 2003 fxdx. I’ve ran many other “top of the line” shocks on my bike in the past and have blown out every one in less than a season. I’ve ran these for 2 seasons now and still preform the same as the day I got them. When I put them on I could tell a difference in how much traction it gave my rear tire in corners and clutching up for wheelies. I also noticed I get a lot less brake dive in the rear end while coming to a stop and while slowing down wheelies. No matter what you’re doing these really keep the bike planted.