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 specifications of various Dunlop tyres and well base wheels.
| Identifier | ExFiles\Box 42\1\ Scan043 | |
| Date | 26th February 1926 | |
| Handwritten References: X5509, X5725 Left Tyre Diagram: Pressure: 20 LBS / ☐" Size: 7.30 x 34." Dimension Table: A: 8.0" B: 8.8" C: 112.5" Center Tyre Diagram: Pressure: 30 LBS / ☐" Size: 6.75 x 33." Tread Label: C = CIRCUMFERENCE Dimension Table: A: 6.55" B: 8.0" C: 110.5" Right Tyre Diagram: Pressure: 30 LBS / ☐" Size: 6" FOR 21" RIM. Dimension Table: A: 6.10" B: 7.4" C: 106.5" Title: DUNLOP TYRES & WELL BASE WHEELS Stamp: ROLLS-ROYCE, LIMITED PRINT ROOM 26 FEB 1926 DERBY | ||