wheel and clutching question

Hello, I have a stock 2015 polaris sportsman 570, I’m about to buy new tires and wheels. I’m thinking about going with 27" tires (mega mayhems), will I need clutch work going from 25" tires to a 27" tire? And what’s the best offset for a stock height setup, my stock tires are less than half an inch from rubbing my shocks. Thanks!

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