Gearbox Question Grinding Me

[Razgruff]

As far as Im aware its not something currently adopted in any production motorcycle (I could be wrong though). I know they have started using them in some racing applications (some BRISCa F2's run them, as do some drag machines).

I think they are more important in applications where high torque capabilities are needed though - hence their wider use in commercial lorry applications?

I couldn't remember the reasoning behind the twin counter-shaft idea, but knew that torque was involved,.
I just wondered if there was a weight saving advantage that may have been used on more high performance engines.
But I guess that with the need to stop the back wheel spinning up and the introduction of traction control, there isn't so much power being fed through the box suddenly.