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 sheet for a 25 HP Front Road Spring.
| Identifier | ExFiles\Box 52\2\ Scan286 | |
| Date | 30th May 1931 | |
| X4429. 30.5.31. X5410 X4429. Re. 25 HP. FRONT ROAD SPRING. Piece No. F.55520. Length 38". Loaded Lbs. 720. Width 1.75" Loaded Camber 3/4" Pos. Initial Camber 4.250 Thickness of plates. - Main plate ...... .210 2nd plate ...... .201 3rd plate ...... .188 4th plate ...... .190 5th plate ...... .178 6th plate ...... .172 7th plate ...... .173 8th plate ...... .174 9th plate ...... .170 S. Smith. | ||