The JTF 434.16 adds 1 tooth up front and there is no need to cut the chain, especially if you wait a few hundred miles for the stock chain to stretch a little. The 16 tooth has worked well for me except for last week I went up 7,000 feet into the mountains with the wife 1 up and the bike got a workout. Although we got where we needed to go, I will definitely bring the 15 tooth and extra jets next time we go up.
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2013 SSR XF-250
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