What are all of your thoughts on the RK chains and JT sprockets? I wanted to pick up a couple of extra rear sprockets, and the JT's are priced right at $20 each for steel. I ride mostly dunes, trails, etc, so weight is not a big factor, but I don't wanna buy junk. Same questions for the RK chains. Was going to upgrade to an O-Ring chain,and theirs are only about $35 vs. 50+ for most of the others out there. Any good? Thanks for any input. If not these, then what do you all reccomend