Anybody know the BCD on the inner chainring on this chainset?

[slowmotion]

Thank you Adrian.

I have a cunning plan.

 

[Pumpkin the robot]

The climb out of Settle (high hill lane) is 20-25% at times but only for half a mile. I did it last year on 34 28 and although it wasnt easy, on 30 30 it should be pretty easy.