http://motiontek.ca/pulley.html haven't got anything from them..
i got mine from
http://www.bbman.com/products/timing...t-pulleys.html
one was defective and i had to send a few emails to convince them to replace it, other than that they were pretty good


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from what I can read you are looking for a 4.5:1 ratio, while going at spd-si web site take a look at their center distance designer
