These are the codes used to "define a ride difficulty."
AA: Over 22 mph
A: 19-22 mph advanced pace with few stops.
B: 16-19 mph vigorous pace with occasional stops.
C: 13-16 mph steady pace, rest stops every hour.
D: 10-13 mph sightseeing pace, semi-frequent stops at key points to wait for riders.
E: Under 10 mph relaxed pace, frequent stops to wait for everyone.
MBR: Mountain Bike Ride
1. Multiple long and/or steep climbs
2. Multiple and/or large hills
3. Rolling with some hills.
4. Generally flat or rolling.
Ride Rating Example:
D/4/30 = a 30 mile, 10-13 mph ride over flat terrain