As Sosidge said, in the states and Australia they have adopted17.5 as the equvalent to a 27T stock, and 13.5 as equivalent to 19T.
In europe the equivalence is taken at 10.5 for 19T and 13.5 for 27T.
At my club (TC's) there is still one guy running a brushed 27T against everyone else on brushed (and that includes new timing adjustable speedos) and he's just a bit short on top end, but with a bit more torque, but then it's a good brushed and it's a small track 10mx20m. I think on larger outdoor tracks the brushless hass a speed advantage.
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