This is the system used by the Black Hills 4-Wheelers club.
VERY similar to the Black Hills Jeeps' system.
1 | 1-2 | Passable by stock and 2WD vehicles, improved dirt, gravel etc. |
2 | 3-4 | Scenic, touring trail ride; four wheel drive required occasionally, some mud holes or rocks that would stop most other vehicles are traveled easily in 4WD. |
3 | 5-6 | For novice and experienced drivers alike; the most fun four wheeling you can expect to have in a stock four wheeler; low range may be required often; vehicle damage is a possibility. |
4 | 7 | Not advisable for novice drivers; potentially dangerous situations; maximum ground clearance, lowest gears, and minimum tire size of 33 inches required; lockers, limited slips, winches, and jacks advised due to moderate to large rocks and obstacles, vehicle damage is likely. Full size vehicles limited to specific trails at this rating. |
4+ | 8 | Not advisable for novice drivers; potentially dangerous situations; maximum ground clearance, lowest gears, and minimum tire size of 33 inches and one locker or two limited slips required; jacks and winches indispensable due to large boulders, steep inclines; vehicle damage is very likely. Full size vehicles limited to specific trails at this rating. |
5 | 9 | No novice drivers; dangerous situations; maximum ground clearance, lowest gears, minimum tire size of 35 inches and two lockers or limited slips required; jacks and winches indispensable due to large boulders, steep inclines; vehicle damage assured. Full size vehicles limited to specific trails at this rating. |
5+ | 10 | For the hard core experienced driver; extremely dangerous situations; maximum ground clearance, lowest gears, minimum tire size of 35 inches, two lockers, and winch are required. Full size vehicles limited to specific trails at this rating. |
Note: Trail ratings are highly subjective. A trail that is easy for an experienced driver with a highly modified vehicle may be impassable for a novice driver in a stock vehicle. Weather conditions may also significantly affect the difficulty of a trail. Also, the difficulty of a trail may change over time, as trail use, weather, and maintenance modify the trail. Always check with the managing organization and/or recent users before planning a trip on a trail and scout ahead on foot if you are not sure of current conditions.