A little pulley sizing help please.

Discussion in 'Transmission / Drivetrain' started by troyg, Aug 22, 2015.

  1. troyg

    troyg Member

    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.