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).
Suspension system data including unsprung weights, spring loads, rates, and wheel movements.
| Identifier | ExFiles\Box 154a\4\ scan0096 | |
| Date | 1st March 1939 | |
| -3- Unsprung wt/front wheel 140 lb. Unsprung wt/rear wheel 205 lb. Loads on springs (Measured at wheel). 1 driver. + 4 passengers. O.S.F. 827 lb. 902 lb. N.S.F. 792 lb. 867 lb. O.S.R. 845 lb. 1060 lb. N.S.R. 855 lb. 1070 lb. Spring Rates. O.S.F. 120 lb/in. Δ = 6.9" U.L. 7.55" L. N.S.F. 120 lb/in Δ = 6.6" U.L. 7.40" L. O.S.R. 140 lb/in Δ = 5.7" U.L. 7.55" L. N.S.R. 150 lb/in Δ = 6.2" U.L. 7.30" L. Rear roll rating 112 lb/in. at wheel. Front roll rating 138 lb/in at wheel. No roll bars fitted. Front Wheel Movements. Rebound. Unladen Laden Bump. O.S. 6" 3" 2" 0. N.S. 6" 3¼" 2¼" 0. Rear Wheel Movements. Rebound. Unladen Laden Bump. O.S. 7½" 4¾" 3¾" 0 N.S. 7½" 5" 3½" 0 ................... | ||