| D - Outer Diameter | N/A 620 mm24.409 in | 
| B' - Inner Ring Width | N/A 118 mm4.645 in | 
| B - Outer Ring Width | N/A 118 mm4.6450 in | 
| R - Inner Ring "To Clear" Radius1 | N/A 3 mm0.120 in | 
| r - Outer Ring "To Clear" Radius2 | N/A 3 mm0.12 in | 
| da - Inner Ring Backing Diameter | N/A 499.000 mm19.7000 in | 
| Da - Outer Ring Backing Diameter | N/A 586.000 mm23.100 in | 
