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).
List of approximate weights for the 20 HP chassis with medium pressure tyres and wellbase wheels.
| Identifier | ExFiles\Box 107\4\ scan0087 | |
| Date | 16th January 1928 | |
| XW538 20 HP. ROLLS-ROYCE CHASSIS WITH MEDIUM PRESSURE TYRES & WELLBASE WHEELS. APPROXIMATE WEIGHTS. Cwts.qrs.lbs. TOTAL LBS Chassis with 4 wheels average weight. 22. 1. 25. 2517 The above figures include:- Oil........................ 16. 16 Water...................... 1. 12. 40 Petrol, 14 gallons......... 3. 21. 105 Tyres 4, Wellbase @ 31 lbs each 1. 0. 12. 124 Battery with acid.......... 2. 24. 80 Rear carrier for spare wheel.. 9½ 9½ Weights of chassis also include:- Switchbox and gauges. Front wing stays. Head lamp brackets. Battery Box. The following (A) (B) (C) are not included in above weights:- (A) R.R.Luggage carrier. (15) R.R.Spare wheel side carrier (7) (B) Spares:- 1 Spare well-base wheel (29) 1 spare Wellbase tyre (31) R.R.Tools and spares... (22) Jack................ (7½) Tyre Pump............... (6½) Mallet.............. (1½) Wheel spanner............ (4½) Extras.............. (½) Hydrometer............... (½) Total 3 qrs. 19 lbs.= 103 lbs. (C) Accessories:- Windhorn................. (3) Number plates two.... (4) Head-lamps............... (11) Wing Lamps........... (2) Rear Lamp................ (½) Instrument board lamps(1) two. Inspection lamp & lead. ( 1) Lamp bulbs in case (½) R.R.Mascot............... ( 1) Badge................ (1) Speedometer.............. ( 4) Clock................ (1) Screen wiper, one........ ( 2) Total 1 qr. 4 lbs = 32 lbs. NOTE. Chassis with 4 W.B. Artillery wheels weigh 1 qr 16 lbs.(44 lbs) more and spares weigh 11 lbs. more than chassis and spares with well base wire wheels. Chassis with four straight sided wire wheels weigh 1 qr. 12 lbs. (40 lbs) more, and spares weigh 10 lbs. more than chassis and spares with wellbase wire wheels. Chassis with 4 straight sided artillery wheels weigh 3 qrs 24 lbs (108lbs.) more and spares weigh 27 lbs. more than chassis and spares with wellbase wire wheels. [Handwritten note on left] Pre AWB 2783 lbs with Tools, Spares, water, petrol, acces. | ||