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).
Listing vehicle modifications and associated weight calculations.
| Identifier | ExFiles\Box 3\2\ 02-page036 | |
| Date | 18th November 1913 | |
| X200 18.11.13 Swan Neck Exhaust Dunlop Whls. + Rear Brakes Front axle Pistons + axle. " Deeper side Channels / 2600) Widening of car for Extra Wt of Dunlop W.Ws 44 1/2 lbs (4 whls) tubes + tyres heavier than std wood ? Increase of 2784 on 2600 = 184 lbs | ||