kielder to participate in the dirty reiver gravel bike event. they have sinned u- reiver gravel bike event. they have signed up to reiver gravel bike event. they have signed up to express reiver gravel bike event. they have signed up to express it reiver gravel bike event. they have signed up to express it 200 - signed up to express it 200 kilometre route and you can get into some unbelievable wilderness places that you can t do normally in other places in england. places in england. organisers say all accommodation places in england. organisers say all accommodation within - places in england. organisers say all accommodation within a - places in england. organisers say all accommodation within a 40 i all accommodation within a 40 kilometre radius is sold out, showing the ever growing popularity of gravel bikes. it showing the ever growing popularity of gravel bikes. of gravel bikes. it looks like a road bike. of gravel bikes. it looks like a road bike, but of gravel bike