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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).
Table detailing S.A.E. standards for balloon tires and rims for passenger cars.

Identifier  ExFiles\Box 17\7\  Scan054
Date  4th December 1929
  
Revision approved by the Tire and Rim Division Dec. 4, 1929,
for submission to Standards Committee meeting on Jan. 20, 1930

BALLOON TIRES AND RIMS
for Passenger-Cars

S.A.E. Standard

| Rim Diam. | 4.75 | 5.00 | 5.25 | 5.50 | 6.00 | 6.50 | 7.00 |
|---|---|---|---|---|---|---|---|
| 18 | | | 5.25-18 | 5.50-18 | 6.00-18 | 6.50-18 | 7.00-18 |
| 19 | 4.75-19 | 5.00-19 | 5.25-19 | 5.50-19 | 6.00-19 | 6.50-19 | 7.00-19 |
| 20 | | | | | 6.00-20 | 6.50-20 | 7.00-20 |
| 21 | | | | | | | |

Flat base
| Recommended Rim Section Width, In. | 2.75 | 4"(2.69) | 4"(2.69) | 4"(2.69) | 4½" (3.12) | 4½" (3.12) | 5" (3.75) |
| Max. Tire Width on Rim Used | 5.05 | 5.15 | 5.35 | 5.60 | 5.95 | 6.40 | 6.90 |

Drop Center
| Recommended Rim Section Width, In. | 3.00 | | | | | | 4.00 |
| Max. Tire Width on Rim Used | 5.20 | | | | | | 6.90 |
  
  


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