UTV 4S1 Track System - RZR 900 Easier switch between tracks and tires allows side-by-side enthusiasts to go out and themselves from the road as quickly as possible, Sturdier and more adjustable tensioner prevents critical part misalignment, Triple bearing design with oil bath lubrication improves durability and stainless sleeves for greater reliability, New anti-rotation bracket bolted onto the frame with factory pre-loaded spring and dual rubber damper (rear only) makes adjusting the rod and track to the required angle easier, Enhanced wheel seal design improves sealing and guiding, reduces wear and eliminates water absorption due to temperature variations