If gravel includes like dirt, mud and kinda rocky stuff there's fucking loads round here, throw in a few old railway lines and you can do 20-50 mile loops from more or less my doorstep, or much further if you want to get a bit peaky. You have to cross the odd road or use a technically asphalt but mainly not old farm track here and there but they all link up pretty well.
If gravel includes like dirt, mud and kinda rocky stuff there's fucking loads round here, throw in a few old railway lines and you can do 20-50 mile loops from more or less my doorstep, or much further if you want to get a bit peaky. You have to cross the odd road or use a technically asphalt but mainly not old farm track here and there but they all link up pretty well.