Thanks for the advice guys. It may be that I try the option of changing the cassette first as it is the cheapest option to start with. Especially if you think that the difference from 30 up to 32T will make some difference. The RD will take 32 but not 34, as far as I am aware.

Hillrider, I am very aware that I bought a CX bike and was recommended to do that for the reasons I explained. Hindsight, as they say, is a great thing! As are the ever changing needs of old age!

Just one more question, please. Why are the cassette ratios so close? It kinda gives me the impression that it has been designed this way to allow for easier acceleration while going up hill. Would that be right?

BTW, Patrick, I had seen that cassette on ChainReaction earlier at £1 dearer! Although, I did think that the extra few quid for a lighter cassette may have been worth paying.

http://www.chainreactioncycles.com/s...e/rp-prod52312