Polaris Idler Wheel Mount Block (Part #5631065)
Updated June 12, 2026
This is a factory replacement idler wheel mount block (also called a wheel mount bracket or support block) for Polaris snowmobile rear suspensions. It bolts onto the suspension rail and supports an idler wheel that guides the track. Fits numerous 2001–2017 Polaris models including Edge, XCSP, Pro X, RMK, Indy, Classic, Widetrak, and Switchback with 500–800 cc engines.
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How it works
The mount block is a cast or machined bracket that attaches to the bottom of the suspension rail. It holds the axle of an idler wheel, which rides against the track to maintain tension and alignment. The block includes holes for mounting bolts and often a backer plate or washer setup. Some lightweight designs reduce unsprung weight.
Common failure symptoms
Over time, the block can crack or warp from impact with rocks or stumps. Bent or broken mount blocks cause the idler wheel to wobble, track misalignment, and abnormal wear on the track and suspension. Missing or loose mounting bolts can lead to wheel loss and further damage.
Installation notes
Removal requires unbolting the idler wheel and axle, then removing two bolts securing the block to the rail. The block often comes with bolts; reuse OEM hardware. Torque to factory specifications. Inspect the rail for cracks at the mounting holes before installing a new block.
