Chassis:
Frame is upswept over front and back axles to achieve lower centre of gravity. Underslung front and rear axles machined from solid billet (back axle to 3mm thickness). Front axle H-section. U- shape sub-frame carries the engine, clutch and gearbox and mounted on the chassis at three points. Alignment of front end of crankshaft is below the centre line of the rear axle; as such the line of crankshaft, the transmission and the propeller shaft slopes downwards towards front in order to keep centre of gravity as low as possible.

Dimensions:
Chassis dimensions and weight of surviving cars vary indicating specificity in body fitting.
Wheelbase 8ft 9 in, Track 4ft 7in

Weight :
1921 Grand Prix de l’A.C.F. – 19.5 cwt
1922 IoM T.T.:
K Lee Guinnes – 21cwt 99lb
H.O.D. Segrave – 22cwt 31lb
J. Chassagne – 22cwt 10lb (2,474lb)
Engine weight dry 520lb.