What is wrong with the IRC tires? I've heard people don't like them but not really any reasons why? As for what tires fit the 250, here you go..
http://faq.ninja250.org/wiki/What_ti...fit_the_250%3F .
And to be specific to the '08 plus
http://faq.ninja250.org/wiki/J_Tires
On my '89 Ninja 250 (previous gen with 16" tires) I've tried Pirelli ST-66 5,540 miles, Bridgestone BT-45 7,792 miles, Kenda K-671 9,841 miles. I'm currently running Avon Roadriders AM-26 with 11,350 miles on them.
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1997 Yamaha Seca II - mostly stock, Racetech upgraded forks, FZ6R rear shock, Oxford Heated Grips, Barkbusters Blizzard Handguards, a Scottoiler vSystem chain oiler. My
Mileage Tracker Page.