RT Pro introduces an amazing blend of ride quality and performance for the RZR 4 900. Our Dynamic Inertia Spring System (D.I.S.S.) has been proven for years in other replacement spring kits we sell and seems to get better and better for each model that comes out.

This kit is a complete set of dual rate spring for the front and rear which are 2.5" I.D.. This make this kit universal to all aftermarket 2.0" or equivalent shocks so if you ever decide to upgrade to aftermarket shocks you don't have to buy shocks with springs. You can take your RT Pro springs with you!

This kit includes adapter rings which convert the OEM upper and lower spring retainers from a 2.25" ID set up to the 2.5" springs that come in this kit. The kit also includes RT Pro's molded Delrin spring spacers. These are designed to slide up and down the body of the shock straight and true for a long time due to their precision design and high quality American material. They will also last much longer than our competitors because they have better wear characteristics and built in UV protection.

RATES

We found there really only needed to be two rate kits needed for the 4 seat model. The Standard rate kit works great for 2-4 people without a ton of extra gear loaded beyond what the average owner takes with them for a day on the trail or dunes. The Heavy Duty kit is recommended when carrying 4 full size people and lots of gear/accessories.

RACE RETAINER UPGRADE

While it's rather uncommon on this model, we've managed to break a couple of the OEM lower spring retainers during extreme driving. Due to this, RT Pro has designed custom billet Race Retainers which substantially improve on the original design by increasing the cross sectional area of the part as well as employing much better materials. All Race Retainers are gold anodized.