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).
Test report on Dunlop straight-sided tyres for the week ending 27th June 1920.
| Identifier | ExFiles\Box 45\1\ Scan046 | |
| Date | 27th June 1920 | |
| Tests on Dunlop straight-sided tyres for week ending 27th. June. Particulars of Car - R-R 40/50 - fitted with double limousine Body, wire wheels - Goodyear rims. Weight - rear 1 ton. 7 cwt. - front 1 ton 1 cwt. Tyre pressures 80 lbs. in rear 65 lbs. in the front. | Date. | Tyres fitted. | Position on Car. | Total miles run. | Daily miles. | Route taken. | Remarks. | |---|---|---|---|---|---|---| | 21.6.20 | FD.{Frank Dodd - Bodies}2012 FD.{Frank Dodd - Bodies}3168 FD.{Frank Dodd - Bodies}1908 FD.{Frank Dodd - Bodies}1648 | O rear N rear O front N front | 785 | 195 | Derby to Manchester and back. | 35 M.P.H. average speed. | | 22.6.20 | FD.{Frank Dodd - Bodies}2012 FD.{Frank Dodd - Bodies}3168 FD.{Frank Dodd - Bodies}1908 FD.{Frank Dodd - Bodies}1648 | O rear N rear O front N front | 927 | 142 | Derby to Worksop and district. | 32 M.P.H. average speed. | | 23.6.20 | FD.{Frank Dodd - Bodies}2012 FD.{Frank Dodd - Bodies}3168 FD.{Frank Dodd - Bodies}1908 FD.{Frank Dodd - Bodies}1648 | O rear N rear O front N front | 935 | 8 | Local run. | | | 24.6.20 | FD.{Frank Dodd - Bodies}2012 FD.{Frank Dodd - Bodies}3168 FD.{Frank Dodd - Bodies}1908 FD.{Frank Dodd - Bodies}1648 | N.rear O rear O front N front | 1015 | 80 | Derby to Manchester. | Rear tyres changed over. | | 25.6.20 | FD.{Frank Dodd - Bodies}2012 FD.{Frank Dodd - Bodies}3168 FD.{Frank Dodd - Bodies}1908 FD.{Frank Dodd - Bodies}1648 | N rear O rear O front N front | 1155 | 140 | Manchester to Gt. Malvern | 30 miles per hr. average speed. | | 26.6.20 27.6.20 | FD.{Frank Dodd - Bodies}2012 FD.{Frank Dodd - Bodies}3168 FD.{Frank Dodd - Bodies}1908 FD.{Frank Dodd - Bodies}1648 | N rear O rear O front N front | 1426 | 271 | Gt. Malvern to Guildford. Guildford to Lyme Regis. | 30 M.P.H. average speed. | | ||