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).
Decisions and considerations on various vehicle components and specifications.
| Identifier | ExFiles\Box 18\6\ Scan017 | |
| Date | 29th November 1920 | |
| 4. Twin Wheels. The Technical Dept. should experiment with a view to ascertaining which tyre is most satisfactory with twin wheels. Mr. Royce will not recommend twin wheels, but we are prepared to fit them if wanted - in the Michelin pattern rather than the wire. Larger tyres should be fitted in preference until the Michelin disc wheels are ready. 5. Harland Wheels and Harland Rims, or Harlands on Wire. The objection may possibly be weight. We are anxious not to add to the unsprung weight because the rear axle is already heavy. The Works will experiment and report, taking into consideration the fact that two detachable devices are not necessary. We do not recommend this fitting, but we can fit if customers insist. To meet the cleaning difficulty Michelin disc wheels will soon be available. Mr. Royce is of opinion that we should either purchase or manufacture a stand to be used when changing tyres. The Works will experiment and report upon this, also. 6. Bonnet locks fitted as standard. No decision. [7]. Question of 895 x 150 Rear and 135 Front. Mr. Royce considers that 135 tyres front and 150 back are most satisfactory. If required 150 could be fitted all round. 8. Weight of Complete Car. It was decided that the total weight of the car for the purpose of the Guarantee should be put at 36-cwt. 9. Lifting Handle in centre of Bonnet to make same easier to raise and lower. (Debutante.) The Works are fitting bonnet clips closer together to facilitate the raising and lowering of the bonnet, during the first 250 chassis and onward. | ||