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).
Tyre options for 21' rims on the 40/50 HP car and fitting instructions for traction tread tyres.
| Identifier | ExFiles\Box 45\1\ Scan381 | |
| Date | 5th November 1926 | |
| X44050 To BY.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}3/LG5.11.26. TYRE EQUIPMENT FOR RR. CARS. X44050 Y4565 Attached is a list of other makes of tyres which will fit on our 21" rims. We do not want any other tyre but Dunlop or possibly Michelin to be fitted as balloons on the front of the 40/50 HP. car. We consider it would be as well to let customers know that there are other makes of tyre which fit this size of rim so that they could obtain them if they were stranded. We have an additional piece of information in connection with the 6.75" traction tread tyre which we think might be circulated in the Instruction Book - it is as follows :- "When driven hard, the traction tread tyre wears so that the back edge of the diamond studs is lower than the front edge. It is important that if tyres are changed when in this condition, they should be fitted so that the tread runs in the same direction as previously otherwise if the direction of rotation of the tread is reversed, the treads will produce a very objectionable noise". Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Please return list to Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||