You can always swap out for a 42 tooth sprocket. http://www.oneupcomponents.com/products/42-tooth-sprocket Crazy money for an added wear component though.
They are.. If they were available, I'd fit a 38 or even a 40 .
Gotcha.Sorry Rob but my Cube has a 9 speed 11/34 as std & I fitted a 12/36.
Those range extender sprockets you recomended are for 10 speed cassettes ! And stupidly expensive.
If and when I need to change, I'll consider a 9 speed hub gear but at the moment I'm running two sets of wheels/cassettes.