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).
Specification comparison table for various car models, including gear ratios.
| Identifier | ExFiles\Box 117\1\ scan0053 | |
| Date | 12th November 1935 guessed | |
| SPECIFICATION | | P.2.X | P.2 | C.7 | C.8 | S.G. | CUL | C.2. | C.3. | C.W. | |---|---|---|---|---|---|---|---|---|---| | Wheelbase | 114" | 114" | 118" | 133" | 115¾" | 123" | 128" | 137" | 146½" | | Cylinders | 6 | 6 | 6 | 8 | 6 | 8 | 8 | 8 | 8 | | Cylinder Bore Ins. | 2⅞ | 3⅛ | 3⅛ | 3¼ | 3⅜ | 3¼ | 3¼ | 3¼ | 3½ | | Stroke - Inches | 4⅛ | 4⅛ | 4½ | 4⅛ | 4½ | 4⅛ | 4⅞ | 4⅞ | 5" | | Cubic Displacement - | | | | | | | | | | | Cu. Ins. | 201.3 | 201.3 | 241.5 | 273.8 | 241.5 | 323.5 | 323.5 | 323.5 | 384.8 | | R.A.C. Rating | 19.8 | 23.4 | 27.3 | 33.8 | 27.3 | 33.8 | 33.8 | 33.8 | 39.2 | | Developed H.P. | 70 | 82 | 93 | 101 | 100 | 115 | 123 | 123 | 150 | | RPM for " " | 3600 | 3600 | 3400 | 3400 | 3400 | 3400 | 3400 | 3400 | 3200 | | Compression Ratio | 6.07 | 6.07 | 5.4 | 5.77 | 6.2 | 6.5 | 6.5 | 6.5 | 6.5 | | Rear Axle Ratio | 4.125 | 4.125 | 4.125 | 4.1 | see below | see below | 4.3 | 4.3 | 4.42 | | Brake Drums | | | | | | | | | | | Diameter Ins. | 10 | 10 | 10 | 10 | 11 | 13 | 13 | 13 | 15 | | M/M | 254 | 254 | 254 | 254 | 279.4 | 330.2 | 330.2 | 330.2 | 381.0 | | Width Ins. | 2 | 2 | 2½ | 2½ | 2¼ | 2½ | 2½ | 3 | 3 | | M/M | 50.8 | 50.8 | 63.5 | 63.5 | 57.15 | 63.5 | 63.5 | 76.2 | 76.2 | | Tyres | 6.00 x 16 | 6.00 x 16 | 6.25 x 16 | 6.50 x 16 | 6.50 x 16 | 7.00 x 16 | 7.50 x 16 | 7.50 x 16 | 7.00 x 17 | | Petrol Tank Capacity | 12 | 12 | 12 | 12 | 14½ | 16½ | 16½ | 21 | 21 | | Turning Circle | 36" | 36" | 38" | 42" | 38" | 42" | 44" | 46" | 48" | GEAR RATIOS S.G. | Automatic | Overdrive | |---|---| | 4.125 | 4.3 3.03 | | 6.39 | 6.41 4.51 | | 11.59 | 11.59 11.59 | | 14.89 | 14.89 14.89 | CUL | | Overdrive | |---|---| | 4.3 | 3.03 | | 6.41 | 4.51 | | 11.14 | 11.14 | | 13.93 | 13.93 | | ||