I need some easier gears for a xc bike, a diamondback coil 04. The shimano rear sprocket gearing is too hard to get up steep hills I am a newbie so I don't know much but I do know some. I need like a power climber or something, my friend told me about it. Also, will I have to change the rear derailluer if I get this gear set? And how much will it cost? I am 13 and don't have a job, I have 11 dollars and I don't think that it is going to get me anywhere. Also, I am concerned about my axles+rims. I don't know If they are strong enough for a mtn bike race team(this is why I am concerned), I have heard bad things about the axles and rims and I don't want to fall and get run over.