I was looking into racing hillclimbs. i would like to start with either a kx250f or kx450f, but leaning towards a 250f, as i am only 15. what would be better? what gearing should i use? I was thinking a smaller counter sprocket and a smaller rear sprocket. I would like to get a lowering link and a shaved seat, just for extra control over the bike. what bars would work better, high or low? I would do the standard swingarm extension, killswitch, etc. would removing the front brake be a good idea? And also, do they usually do hillclimbs in first or second gear? Best knobby tires?