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 lap times for two cars with different tyre setups at Brooklands.
| Identifier | ExFiles\Box 113\5\ scan0194 | |
| Date | 6th August 1937 | |
| AT BROOKLANDS 6.8.37. Handwritten: 10 H.P, 1004 | | Standard Wheels & Tyres 5.50 x 18. | Standard front 6 x 19 Dunlop Racing rear. | Standard front 6 x 19 rear (cut-out open). | Standard front 6.50 x 17 rear | |---|---|---|---|---| | Lappins | | | | | | Bentley Std. 4 1/4 litre. | Lap. 114.2 secs. 87.07 m.p.h. Half mile 20.6 secs. 87.38 m.p.h. | Lap. 112 secs. 88.94 m.p.h. Half mile 20.2 secs. 89.11 m.p.h. | | | | B-56-BN{W.O. Bentley / Mr Barrington} O.H.C. Engine. | 112 secs. Lap. 88.94 m.p.h. Half mile 20.2 secs. 89.11 m.p.h. | 110.6 secs. Lap. 90.22 m.p.h. Half mile. 19.8 secs. 90.91 m.p.h. | 107.2 secs. Lap. 92.92 m.p.h. Half mile 19 secs. 94.74 m.p.h. | 110.6 secs. Lap. 90.22 m p.h Half mile 19.8 secs. 90.91 m.p.h. | Rm{William Robotham - Chief Engineer}/F.Dodd. | ||