alright guys. i got a 2010 yz450f and a 07 yz250f. i have no need to spend 60+ dollars on a renthal sprocket if somethin cheaper works the same. i saw rockymountainmc.com has a sproket thats under 20 bucks. anybody use this? ne input on them? and my next question, obviously theres a big torque difference between the bikes, but are the rear sprockets interchangable? i will be riding different tracks this year, and both bikes will be with. i was wonderin if i can carry different tooth sprockets nd use them on both bikes?