A little pulley sizing help please.

troyg

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I'm trying to do a DIY GEBE build on a 20" wheel with V-belts instead of cogged timing belts, and am having a bit of trouble with the ratio thing.

OK, a GEBE large sheave is 53" around, the small gear/cog is 2" around.
My new sheave is 38.5" around,...
what size pulley (around) do I need to get roughly the same power range?
Thanks in advance.
 
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