New Tires for 550 Grizz?
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I would probably stay with the 26". The bigger you get the more likely you are to need clutching changes. I have the XTRs and love them so far. The only thing I haven't tested them on is deep snow. I've been through deep mud and water, big rocks, and hard and soft pack. They've been excellent. 589s are tough tires that will get you through just about everything but will not have as nice a ride as the XTRs.
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