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Chain needs a good coupla links removing an all.

S'nice though.

I doubt it, the dérailleur has to accommodate another 20 sprocket teeth from where it is now.

I understood that the rule of thumb should be;
With the chain the largest front ring and the smallest rear sprocket both jockey wheels should be in vertical alignment with the centre point of the hub.
Like here

Or is this some other nonsense because it's an MTB drivetrain?