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the nitride 8-rib vortech 7" pulley is around 85$ and the blk aluminum one is around 115$. which one should I buy. what is the difference?
 

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The aluminum is lighter and takes less power to spin. The difference in weight is only about 2lbs, but when you spin that to 6000RPMs it makes a big difference. Angular acceleration is a=V^2/r and F=m*a assume angular acceleration is the same for both the nitride pulley will put twice the force on the crank. That probably only translates to a few hp but every little bit helps.
 

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Axistang-where did you find those pulleys that cheap?? Are you talking about the ASP pulleys?
 
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