I use them happily in the flinty New Forest, no trouble, they have done well (at least as good as Schwalbe Rocket Ron Evo for example). Also I have used them for camping trips on Dartmoor, again no trouble. They are a bit wriggly on mud.
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Pic makes them look lighter, theyre actually almost brown. So what the hell are the light yellow ones called then? These were advertised as classic.