From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Specification table for S.A.E. Standard balloon tires and rims for commercial vehicles.
| Identifier | ExFiles\Box 17\7\ Scan055 | |
| Date | 1st August 1929 | |
| BALLOON TIRES AND RIMS for Commercial Vehicles S.A.E. Standard Tire Sections, In. Rim Diameter, In. 20 22 Nominal rim-section width, in. Actual rim width between flanges, in. Rim flange height, in. Maximum permissible tire width, in. TABLE DATA: Header Row: 5.00, 5.50, 6.00, 6.50, 7.00, 7.50, 8.25, 9.00, 9.75, 10.50 Row '20' Rim Diameter: 5.00-20, 5.50-20, 6.00-20, 6.50-20, 7.00-20, 7.50-20, 8.25-20, 9.00-20, 9.75-20, 10.50-20 Row '22' Rim Diameter: (empty), (empty), (empty), (empty), (empty), (empty), 8.25-22, 9.00-22, 9.75-22, (empty) Row 'Nominal rim-section width, in.': 4, 5, 5, 5, 5, 6, 7, 7, 8, 9-10 Row 'Actual rim width between flanges, in.': 2.69, 3.75, 3.75, 3.75, 3.75, 4.33, 5.00, 5.00, 6.00, 7.33 Row 'Rim flange height, in.': To be in accordance with the Tire and Rim Ass'n specifications approved August 1929 Row 'Maximum permissible tire width, in.': (empty), (empty), (empty), (empty), 7.20, 7.75, 8.50, 9.25, 10.05, 10.95 | ||