Mountain Bike Trail Classification. Many trail networks use this type of system, most notably resort-based mountain biking trail networks. Suitable for beginner mountain bike riders with basic riding skills and off-road bikes.
The network of exhilarating and challenging world-class trails in Scotland's forests have made the country a big hit on the mountain biking world map. Extreme For highly experienced mountain bikers. Photo courtesy of Leslie Kehmeier, International Mountain Bicycling Association.
As good as any grading system may be, trail surfaces will vary throughout the year – and particularly during or after heavy rain.
Large, unavoidable obstacles and severe features.
IMBA has come out with a method for rating mountain bike trail difficulty in the book Trail Solutions: IMBA's Guide to Building Sweet Singletrack. The system applies to mountain bikers best, but also is applicable to other visitors such as hikers and equestrians. Intermediate: A trail with moderate gradients, variable surface and obstacles.