I think in many race series' they run as 10.5/19t and 13.5/27t. But that is very heavily stacked with brushless. A timed 13.5 will totally destroy a 27t.
IMO the proper equivalents are probably something like 17.5 no boost = 27t, 17.5 boosted = 19t. I know my boosted 13.5 is much faster than my 19t checkpoint as I have run both recently (ran 19t in the summer as only just started back after uni break).
So I think that would possibly make boosted 13.5 = 12tmod and 10.5 boosted = 7t mod. I reckon that makes sense as I think the 10.5 track record around Halifax is something around the lap record with old 7t mod.
These days a 6.5 with a little timing would more than likely kill any brushed motor ever made.
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