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Going from 25 tires to 26 an from 12 to 14 rims can I tell any power loss on machine will I be happy without clutch kit thanks.
 

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The weight difference is more of a concern than one inch change. Also, going to a 14 inch rim and only one inch bigger will result in a rougher ride due to less sidewall.

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Tire weight makes a huge difference in performance. Like was stated, the 570 has a harsh ride already so adding lower profile tires is not going to make it more plush.
 

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Yes, tire weight in conjunction with taller tire is a huge factor. In the other thread, I said that was exactly why went from a heavy 35lbs/tire RipSaw set up to a 21lbs/tire setup. With the heavier setup, if you run it in high and take long steep hills, your machine will lose steam without a clutch kit. Problem is, the clutching only does so much. It give and take. I had to compromise my top end and hit Rev limiter at 48mph (10 mph less than stock setup), but my low and mid power band was fantastic, arguably faster to 30 than stock. I started running with more 900 groups and wanted a bit more speed on logging roads as that's what these groups preferred. I went to Denniskirk.com and research a lighter rolling stock setup and came up with a setup that was only 1/2 shorter tire but shaved a total of 65+ lbs in wheels and tires. With only 45hp, it allowed me to change clutching so that my power and was very even all the way across as well as my 58mph Rev limit.
Think about what your driving preferences are, terrain you travel, and how you use your machine.
I use mine to hunt in the fall, but run mountain road and trails with a kayak strapped on top to fish during the summer, and desert running in the winter. My entire setup including doors, windshield, etc are setup to meet these preferences. I never went for a look. I'm more of a function over form kind of guy.
 
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