theres NO reason to change gearing of any kind to get a nwer 600 in the air ( the only one that might have trouble is i believe the new r6 with its new system designed to keep the bike on the ground). Also if you cant get the bike up till 45 mph you must be using all throttle no clutch. WRONG! Wheelies should be able to be performed from just a few rolling mph 7+ without any problems. Let off the clutch so the bike is rolling, grab the clutch, run the rpms midway up the tack, let go it ( and I really me just let go, BE CAREFUL tho and dont start off at midway on the tach work your way up, this will jump the bike up right from the start, also it wheel bump your speed up so lightly use the rear brake and slow yourself back down to a safe speed ,10-20 mph and balance yourself and the bike and you will be fine, or while the front is already up, gradually increase speed and ride that wheelie for as long as you'd like.