Legend

Classifications are based on an individual riding at a sustained pace on level ground.  Actual speed may change depending upon terrain/weather conditions. Riding skills required are also listed.

Training Pace - may exceed posted speeds with fewer and shorter rest stops.
Social Pace - follows all parameters of that ride level.

AA:  Slow. Less than 10 mph.  For families with children and for those who would like a slower pace.  Re-groups often.  Waits for slower riders.
A:  Leisurely. 10-12 mph.  Stops as needed.  Some riding skills required.  Waits for slower riders.
B:  Moderate. 13-15 mph.  Good riders.  Social pace.  Re-groups every 30-45 minutes.  Waits for slower riders.
C:  Brisk. 16-19 mph.  Experienced riders.  Social pace.  Re-groups every hour.  Requires pace line riding.  Will wait for slower riders.
D:  Fast. 20+ mph. Strong riders.  Race pace.  Infrequent stops.  Requires pace line riding.  No obligation to wait.

Terrain
1: Generally flat = Woodward to Friant: Reedley (0%)
2: Easy grades with a few hills = Piedra (1-3%)
3: Rolling hills = The Circuit; Bass Lake Loop (3-5%)
4: Harder hills = Prather; Humphrey's (5-8%)
5: Hillmania = Wildcat; Sky Harbor; Walker Grade (8-13%)
6: Unbelievable = Tollhouse Grade; Big Creek Rd. (13+%)

Example

When you look on the ride calendar and see in the Rating Column something like B/3/26 Social; that means ride is a B skill level rated ride, with a number 3 rated terrain, 26 miles long, and a social pace.