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).
Comparative table of chassis dimensions for various car models.
| Identifier | ExFiles\Box 86\4\ scan0227 | |
| Date | 25th October 1937 | |
| -3- 25.10.37. TABLE OF COMPARATIVE DIMENSIONS. DIMENSIONS. P.III.WRAITH PACKARD OLDS. VAUXHALL G.M.FRAME B.III. Wheelbase 147" 141" 121" 117" 111" 122" 124" Dash to front wheels 43" 36" 35" 28" 26" - 34" Front wheels to front of cruciform 40" 55" 37" 35" 34" 36" 34" Length " " 40" 48" 67" 74" 52" 68" 87" Rear of cruciform to rear axle. 67" 38" 17" 8" 25" 18" 3" Depth of frame at front 6 1/2" 6 1/4" 6" 5 1/2" 4 1/2" 5 1/2" 4 1/2" " " " centre 9" 8" 6" 5 1/2" 5 1/4" 7" 6 1/4" " " " rear 5" 7 1/2" 5 1/2" 5 1/4" 3" 3 1/2" 3 3/4" Depth cross at front 7" 8" 5 3/4" 5 3/4" 5 1/2" 7 1/2" 6 1/4" " " centre 7" 9 3/4" 6 3/4" 7 3/4" 8 1/4" 10" 8 1/2" " " rear 7" 5 1/4" 5 3/4" 4 3/4" 5" 5" 4" Width of side members 4" 2 1/2" 2 1/4" 1 7/8" 2" 2" 2 3/8" " " cross 2 1/2" 2 3/8" 1 3/4" 2 3/8" 1 3/4" 2 1/2" 2 1/4" Thickness of side members .115" .128" .145" .110" .128" .142" .104" " " " cross .165" .082" .125" .090" .114" .105"x.329" .104" No. of cross members behind cross. 4 3 2 2 3 2 2 Section of frame Box Box Channel Channel & Box Channel & Box Channel & box Channel. " " cross I " " I Channel I Channel. Weight " frame 347 323 266 | ||