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Hey all , I am picking up a 2002 Griizzly 660 on Monday . It still has the factory tires on it that are 25s. Can I go any higher without having to change anything else ? TIA
 

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Welcome

Yes, a true 26" is the tipping point for me, but I still would do some clutch mods. They can be cheap and easy so dont worry about it. If you get bigger tires and want more snap there is plenty of help here when the time comes. Go pick it up!

The stock 25" measures closer to 24 IIRC
 

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Welcome from Colorado.
The stock tires are close to 23.5"s actual height.
I went to 26" tires that measured 26.5" actual height with minimal rubbing when the suspension was collapsed hard.
The taller the tire, the more you may want to do simple C.V.T. mods.
There are tires that measure true to stated size, like the O.G. originals in 25".
 

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Maxxis brand Big Horn Originals.
There is a less expensive offering, the Maxxis Big Horn 2.0 model.
You can read about them at R.M.A.T.V.
Both work well. My O.G.'s have 7000+ miles on them.
 
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