The gravel is four to five inches deep. It could be chipped gravel or pea gravel. The particles are of the same approximate size, about a quarter inch. Epping compares it to a jar full of marbles.
The differences between a road bike and a gravel bike may, at first glance, look small. Both have drop handlebars, a racy ride position and similar-looking gears and tyres. But there are subtle ...