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).
Blueprint comparing three types of Dunlop tyres and well base wheels with their dimensions and tread patterns.
| Identifier | ExFiles\Box 158\1\ scan0021 | |
| Date | 6th January 1927 | |
| THIS TYPE OF TYRE IS NOT RECOMMENDED FOR ROLLS ROYCE CARS. 20 LBS/sq.in. 7.30" x 34.". A 8.0". B 8.8". C 112.5" (UNDER NO LOAD). NEITHER THIS TYPE OF TYRE NOR TREAD IS RECOMMENDED FOR ROLLS ROYCE CARS. 40 LBS/sq.in. FRONT. 35 LBS/sq.in. REAR. 6.75" x 33.". C = CIRCUMFERENCE. 6.55". 8.0". 110.5". 30 LBS/sq.in. 6" FOR 21" RIM. 6.10". 7.4". 106.5". DUNLOP TYRES & WELL BASE WHEELS. [Stamp] ROLLS-ROYCE, LIMITED. PRINT ROOM. 6 JAN 1927. DERBY. | ||