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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
  
  


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