The tread pattern of gravel tyres is a tradeoff between rolling speed and traction in loose terrain.

The American Classic Grus tyre sits at the fast-rolling end of the spectrum whilst still providing reasonable traction in a variety of gravel terrain. The Grus is 40mm wide and the closely spaced central pattern feels close enough to a slick in terms of rolling resistance. It has an alternating lug pattern for cornering, but it's not the kind of tyre that's going to have great traction in the mud.

Here at Outspoken Jono has been riding this tyre for a while now and has been very happy with its performance. He mostly rides road/fine gravel but also loves the occasional jank.