I've just had a look at the B+C website and then called them and it seems that they cant get a 42 tooth rear sprocket for my 65 plate 2015 1200 dvt multi. I believe I'm running a 530 chain (will have to check once I get home) and apparently the biggest they do is 41 tooth for the rear. If anyone has fitted a 42 tooth on the rear with a 530 chain where did you source it from ?
TBF if you change to a 42T IME you want a chain change anyway, 2 links longer, so may as well do the front while you're there and change the lot