Comparison table of different Bentley tyre specifications, detailing weights and dimensions.
| Identifier | ExFiles\Box 157\6\ scan0074 | |
| Date | 27th June 1936 guessed | |
| Bentley Tyre Comparisons. Type | Total Comp. Weight | Weight of Wheel | Weight of Cover | Weight of Tube | Balance Extra weights, bolts & Rub.band | Max. width of rim | Max. inside width of rim | Max. width of tyre | Max. width of tread | Circum. unladen 25 lbs/sq.in. | Circum. laden 35 lbs/sq.in. Standard Bentley 5.50 x 18 India(Production 20 HP. with 4-speed box and Front Wheel Brakes). | 53 lbs. 14 ozs. | 21 lbs. 2 ozs. | 26 lbs. 8 ozs. | 3 lbs. 12 ozs. | 1 lbs. 8 ozs. | 4.500" | 3.250" | 6.000" | 4.437" | 94.875" | 90.375" India(Production 20 HP. with 4-speed box and Front Wheel Brakes) Super wide rims 6 x 17. | 58 lbs. | 24 lbs. | 28 lbs. 12 ozs. | 3 lbs. 12 ozs. | 1 lb. 8 ozs. | 5.500" | 4.000" | 6.500" | 4.625" | 94.575" | 89.75" | ||
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).