With the sudden lack on sub £50 Schwalbes about, I've been looking at XR2's and XR3's as potential XC marathon / trail tyres.
They generally get good reviews but I've always thought them to be "low" in knob height and therefore not very "UK Conditions". I had an XR4 once and it was ace.
So whats the real world opinion of XR2's and 3's in the UK?