Just an update in case anyone is thinking about doing the same thing. I had a TA 24 T inner ring put on yesterday and went for a decent spin. Just what I needed. It works perfectly. No problems shifting between the rings. Thank you all for your very useful contributions.
And Ipretro, I know you're right about fitness and I am genuinely in awe of your gear ratios living in Lancashire. My mother was a Lancashire lass and I know you lot are built tough up there (not like us southern softies)! Cheers, Tim.
