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Have a 2019 Polaris Sportsman 850 Highlifter edition. I am wanting to run 20s and 33s and was wanting to know if any upgrades needed to be made to ensure that the bigger tires wouldn’t break anything
 

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Short answer is yes, you will need to upgrade everything. Any time you are making that big of a change from the stock components you will add stress to the OEM drive line parts. They were designed for the stock tires and suspension geometry so going bigger is gonna over tax them. Stuff is going to break. Some you can plan for like stronger axles but the rest might be trial and error. Or reactionary as in fixing stuff that breaks then going back out until something else breaks. 33' tires on 20" wheels won't fit unless you lift the suspension right? So your axles will have to be longer for the lift. Bigger tires and wheels will add rotating weight so the axles will have to be stronger...That extra weight will also require changes in the clutching.....and so on. Until you get to the point where you can go out and run it without having to repair something before you can go out again.
 
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