Edric – as I said, I dont change tyres through the year, but reckon that if you find yourself riding wet rocks alot (and roots to some degree) then the super tacky compound is pretty good. I dont have them on my hardtail though.
I would bet that you make something of an informed choice before just “bunging on some cheapish lightish tyres” ?
I agree that this is a deadly boring subject though, esp when it wanders into the realms of “What Tyres For Coed Y Brenin Beast Trail” type questions – you know you are spending too much time thinking and not enough riding if you’re asking that.
Anyway – I’m going to keep the wire bead tyres for next year’s Alps trip when weight doesnt really matter, and buy a harder compound rear for the UK. Thanks to most above for the advice.