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).
Alternative tyre options and their specifications for the Phantom II chassis.
| Identifier | ExFiles\Box 65\2\ scan0302 | |
| Date | 12th November 1929 | |
| To BY.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/AJL. c. to Da.{Bernard Day - Chassis Design} X 7820 Hs{Lord Ernest Hives - Chair}/AJL3/BE12.11.29. PHANTOM. II. ROAD WHEELS & TYRES. The following tyres are being fitted to Production chassis at customers' request. They will not fit the standard rear spare wheel carrier, and are all larger in diameter and thicker in section than the standard 33" x 6.75" Dunlop Silent Tread Tyre. The wheel carrier requires raising sufficiently to allow the larger diameter wheels to clear the chassis side members. Tyres | Dia. at 35 lbs. sq. in. unloaded. | Max: thickness of tyre section | Remarks 33" x 6.75" Triple Stud Tread Fort Reinforced Dunlop tyre. | 35.4" | 6.9375" | - 7" x 21" Goodyear All-Weather tread. | 35.8" | 7.075" | Used with flat base wheels. 7" x 21" India Balloon tyre. | 35.55" | 7.050" | - 7" x 21" Dunlop Silent tread Fort Reinforced tyre | 35.45" | 6.850" | Special tyre for test purposes to supersede the present standard if approved of. Hs{Lord Ernest Hives - Chair}/AJL. | ||