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).
Comparison of recommended and not recommended Dunlop tyres and well-base wheels.
| Identifier | ExFiles\Box 45\2\ Scan015 | |
| Date | 6th January 1927 | |
| THIS TYPE OF TYRE IS NOT RECOMMENDED FOR ROLLS ROYCE CARS 20 LBS/☐" 7.30" x 34" 40 LBS/☐" FRONT 35 LBS/☐" REAR 6.75" x 33" NEITHER THIS TYPE OF TYRE NOR TREAD IS RECOMMENDED FOR ROLLS ROYCE CARS 30 LBS/☐" 6" FOR 21" RIM. A: 8.0" B: 8.8" C: 112.5" (UNDER NO LOAD) C = CIRCUMFERENCE A: 6.55" B: 8.0" C: 110.5" A: 6.10" B: 7.4" C: 106.5" DUNLOP TYRES & WELL BASE WHEELS ROLLS-ROYCE LTD DRAWING OFFICE 6 JAN 1927 TUL. | ||