Why are you using a Tubeless tyre with a tube btw?
Because it was 'The only tyre in the village'.
Slashed the previous tyre in North Wales & Betws Y Coed is not exactly blessed with choice – it was this or a semi-slick 🙂
Ta for all the advice – bar height is not an issue – bike set up is spot on (as said before, the position was tweaked by the Dales Bike Centre and seems to be working fine for climbing and descending).
Back tyre is a Purgatory, which is very high volume, so no issues there.
One LBS recommended a Minion DH F Supertacky which I fitted last night.
Once on the bike it seems to have a similar gap between the centre tread and the side knobs as the HR: I'll try it myself before letting Sue loose on it, but seems stickier than a fat kid in a sweet shop and has much deeper tread than the HR, so we'll give it a go.
Ta for all the advice folks, much appreciated.