I had dropped my 2011 GG250 down to 12T to good effect.
Counter sprocket wear is increased a few percent. Not bad.
I don?t think I will go with the smaller CShaft on the 300.
Of course, I don?t have enough chain slack for a larger rear sprocket, so a new chain is factored in (I won?t just add links).
At some point the larger rear sprocket starts to interfere with the chain guide. A 50T seems manageable. But I had do modify my 2005 GG 250 chain guide (an XR400 guide) when I tried a 52T and was never quite satisfied with the fit.
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