[uid60001]

Thanks for all the input so far.

It looks like someone did it this year. From paper and commercial available part list, it is quiet easy to achieve 6:1~9:1 reduction with sprockets and timing belt pulley setup. The 6:1 is easily done at CIM's RPM. What worry me is the 12+K loaded RPM. Will the chain jump the sprocket or the belt jump the pulley at that speed under relative heavy load. Interested to hear from someone who tried the setup, whether it is success or failure.

Dean