Schwalbe have had huge kudos for the Marathon Supreme - comfortable, fast, grippy in the dry and wet, light, puncture proof, a road tyre that still manges well on bridlepaths and fireroads, long lasting - so I'm not rejecting their claims for its newer sister out of hand. The new(ish) tyre is the Marathon Extreme and it uses the same high tech materials as the Surpreme.
The Extreme has a grip pattern for offroad, but Marathon rate it just below the Supreme and Race and above road oriented Marathon Plus for speed. They give it their maximum rating for grip on and off road, and for winter use - although thank Cthulhu, they don't claim it is an ice tyre.
Take a look at the rating chart that compares it to other Schwalbes:
I can't find these in 700c in the UK. And the tyres I did find are pricey - £40 a tyre, which is more than I'd pay for a *pair* of excellent Conti Sport Contact slicks. However, the Extremes are also supposed to just as puncture proof as the Supremes and even more durable.
Has anyone tried these? Because if they are as good as Schwalbe claim, they're quite something. I'd be especially interested to find out what the cornering is like - do the square grip pattern, materials and grip rating mean that the Extreme doesn't suffer the classic problem of trail tyres of "walking" sideways as knobbly bits bend under tight cornering?