I'm interested in lowering RPMs on my kitted Stella at "highway speeds"; I know that changing clutches is one way to do it (I am currently running a 21-tooth Cosa-II-type clutch), but with my cases apart I was wondering if there was any reason to think about changing out the fourth gear cog for something taller (which would be what...). Has anyone done this (and can offer advice on what to look for in terms of # of teeth in the replacement gear?
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