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Biggest thing no matter what tire size you go with if you stretch your wheelbase make sure you upgrade your rear shock spring to compensate for it. Stock spring on a Gen 1 is setup for a 185 lb roughly rider size. Longer you go the more leverage the swingarm has so the stiffer the spring you have to go with. I only have a 190 rear tire but would have no problems running a 200 if I choose to, here is a pic of my Gen 1 stretched just over 5", with stretch, lowered 1 1/2" and with my weight being around 230 lbs I needed close to 1000 lb/in spring rate for my setup.
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That is also one of the upgrades I'm making. I went with the 1400lbs. capacity heavy duty spring and I only weigh 215lbs. Thompsonscustomcycles.com is who I purchased my stretching setup through and boy was it worth the money:satisfied:. I got the swingarm, RK chain, brakeline, spring, chain guard, and Vortex sprockets all for a little over 1300 bucks but you can create your own package to suit your financial needs. I can't wait to put everything I bought on my bike. Of course I made probably another $1000 to 1500 in upgrades (once you start it's hard to stop). I'll post pics when my baby comes home from the doctor...lol.