We have shown here a chart that illustrates the effect of using different axle ratios, to engine and road speeds.

Althought the data is calculated for a Bentley R Type using 6.50 x 16 Michelin tyres it is also a useful guide for other Bentley S1, S2 and S3 models. Although these later cars run 15 inch tyres, given their width ratio, the tyre operating radius is not significantly different.

Model	Original Ratio	Ratios We Offer
Bentley MkVI	11/41 (3.72:1)	12/41 (3.42:1) and 13/40 (3.08:1)
Bentley R Type	11/41 (3.72:1) and 12/41 (3.42:1)	12/41 (3.42:1) and 13/40 (3.08:1)
Bentley R Type Cont	12/41 (3.42:1) and 13/40 (3.08:1	12/41 (3.42:1) and 13/40 (3.08:1)
Bentley S1	12/41 (3.42:1)	13/40 (3.08:1)
Bentley S1 Cont	13/38 (2.92)	13/40 (3.08:1)
Bentley S2	13/40 (3.08:1)	13/38 (2.92)
Bentley 2 Cont Early	13/38 (2.92)	13/38 (2.92)
Bentley 2 Cont Late	13/40 (3.08:1) and 13/38 (2.92)	13/38 (2.92)
Bentley S3	13/40 (3.08:1)	13/38 (2.92)
Bentley S3 Cont	13/40 (3.08:1)	13/38 (2.92)