| Description | Date | Identifier | |
| Showing a 'Curve Rib Tread' tyre pattern. | 24th Jun 1938 | Box 158 \ 1 scan0188 | |
| Graph comparing tyre slip angles against sideways acceleration for different tyre types. | 24th Jun 1938 | Box 158 \ 1 scan0189 | |
| Request for a preliminary report on the results of Goodrich Tyres compared to Dunlop and India tyres. | 27th Jun 1938 | Box 158 \ 1 scan0190 | |
| Letter to a tyre manufacturer detailing the test results of two different British Goodrich tyre treads. | 27th Jun 1938 | Box 158 \ 1 scan0191 | |
| Letter from British Tyre & Rubber Co. Ltd. discussing tyre test results, including slip angles and tread noise. | 28th Jun 1938 | Box 158 \ 1 scan0192 | |
| Tyre prices and supply agreements with various tyre companies. | 29th Jul 1938 | Box 158 \ 1 scan0193 | |
| Supplier strategy regarding Avon, Dunlops, and British Goodrich. | 29th Jul 1938 | Box 158 \ 1 scan0194 | |
| Request for an analysis comparing the life of Wraith tyres with 25/30 tyres, including data from running in France. | 2nd Aug 1938 | Box 158 \ 1 scan0195 | |
| Secret memo regarding tyre prices and correspondence with Dunlops. | 9th Aug 1938 | Box 158 \ 1 scan0196 | |
| Heavy steering on the Wraith due to bigger tyres and the prospect of a lower steering ratio. | 15th Aug 1938 | Box 158 \ 1 scan0197 | |
| Secret internal memo discussing tyre pricing and policy for Dunlop, India and Avon tyres on RR and Bentley chassis. | 22th Aug 1938 | Box 158 \ 1 scan0198 | |
| Secret memo discussing tyre prices and supply from Dunlop and India Tyres for the Bentley III. | 23th Aug 1938 | Box 158 \ 1 scan0199 | |
| Decision to use India tyres for 'M' Series Bentleys due to competitive pricing and the need for future goodwill. | 24th Aug 1938 | Box 158 \ 1 scan0200 | |
| Pricing disagreements and lack of co-operation from tyre supplier Dunlop for a new £950 car. | 24th Aug 1938 | Box 158 \ 1 scan0201 | |
| Quotation comparison between Dunlop and Sankey for 4.5' x 16' disc wheels, for a bulk order and for samples. | 24th Aug 1938 | Box 158 \ 1 scan0202 | |
| Ordering schedule for India tyres related to the 'M' Series chassis deliveries. | 26th Aug 1938 | Box 158 \ 1 scan0203 | |
| Tyre price negotiations with Dunlop Rubber Co. and the competitive landscape involving India Tyres. | 26th Aug 1938 | Box 158 \ 1 scan0204 | |
| Tyre price standardization and contracts for Bentley chassis. | 30th Aug 1938 | Box 158 \ 1 scan0205 | |
| Supply requirements and a future delivery gap of India Tyres for the Bentley M. Chassis. | 30th Aug 1938 | Box 158 \ 1 scan0206 | |
| Discussion with Dunlop Tyres regarding pricing for the ensuing season. | 30th Aug 1938 | Box 158 \ 1 scan0207 | |
| Rising road wheel costs after Dunlop Co. acquired competitor Rudge-Whitworth. | 30th Aug 1938 | Box 158 \ 1 scan0208 | |
| Price list for motor tyres for the 1938-1939 season, listing prices from various suppliers. | 30th Aug 1938 | Box 158 \ 1 scan0209 | |
| Tyre pricing negotiations with Dunlop in comparison to India Tyre Company. | 30th Aug 1938 | Box 158 \ 1 scan0210 | |
| Commercial arrangement with Dunlop for tyres, re-wheels, and hubs for the 1938/39 season. | 8th Sep 1938 | Box 158 \ 1 scan0211 | |
| Rebates and reductions with the Dunlop Co. for tyres, wire wheels, and hubs for the 1938/9 season. | 10th Sep 1938 | Box 158 \ 1 scan0212 | |
| Requesting information on the rolling resistance of specific wheel sizes and co-efficients for different surfaces. | 21th Sep 1938 | Box 158 \ 1 scan0213 | |
| Formula for calculating the rolling resistance of wheels to separate it from aerodynamic drag. | 22th Sep 1938 | Box 158 \ 1 scan0214 | |
| Skid pan tests, slip angles, and self-centering properties of various tyres for the Bentley III. | 27th Sep 1936 | Box 158 \ 1 scan0215 | |
| The variation of self-centring torque and slip angle between new and worn tyres. | 27th Sep 1938 | Box 158 \ 1 scan0216 | |
| Sketch illustrating a test rig for measuring wheel slip angle using spring balances. | 27th Sep 1938 | Box 158 \ 1 scan0217 | |
| Sketch diagram illustrating the measurement of rear slip angle on a skid pan. | 8th Apr 1935 | Box 158 \ 1 scan0218 | |
| Graph plotting Total Sideways Load against Total Self Centering Torque for varying castor angles. | 8th Apr 1935 | Box 158 \ 1 scan0219 | |
| Graph plotting rear slip angle against sideways acceleration for various tyre specifications. | 16th Sep 1938 | Box 158 \ 1 scan0220 | |
| Graph plotting tyre self-centring torque and slip angle against total sideways load for various tyre types and conditions. | 12th Oct 1938 | Box 158 \ 1 scan0221 | |
| And comparing Dunlop's figures for tyre rolling resistance against the 'Société Continentale' formula. | 12th Oct 1938 | Box 158 \ 1 scan0222 | |
| Tyre rolling resistance in relation to pressure and speed. | 12th Oct 1938 | Box 158 \ 1 scan0223 | |
| Data table showing tyre rolling resistance at various speeds, loads, and inflation pressures. | 12th Oct 1938 | Box 158 \ 1 scan0224 | |
| Graph comparing the Société Continentale formula and Dunlop figures for tyre rolling resistance at various speeds and inflation pressures. | 19th Nov 1938 | Box 158 \ 1 scan0225 | |
| Urgent internal request to order six 6.00 x 16 covers and tubes for experimental use. | 19th Nov 1938 | Box 158 \ 1 scan0226 | |
| Customer complaints regarding large tyres on the Bentley 'M' series and recommended tyre pressures. | 2nd Dec 1958 | Box 158 \ 1 scan0227 | |
| Letter to Pneumatic Components Ltd acknowledging receipt of two sample balloon tyre gauges. | 5th Dec 1938 | Box 158 \ 1 scan0228 | |
| Testing of Avon tyres as an alternative source to Dunlop, and comparing them to India tyres. | 11th Mar 1939 | Box 158 \ 2 scan0001 | |
| Standardisation of tyres for Bentley Sports cars, comparing Avon and India brands. | 20th Mar 1939 | Box 158 \ 2 scan0002 | |
| Request for records of tyre mileages on Bentleys for specific tyre sizes. | 20th Mar 1939 | Box 158 \ 2 scan0003 | |
| Average tyre mileages for different sizes on Bentley cars, noting some were removed due to splitting. | 21th Mar 1939 | Box 158 \ 2 scan0004 | |
| Effect of increased steering ball joint-tyre clearance on the turning circle diameter of a Bentley vehicle. | 22th Mar 1939 | Box 158 \ 2 scan0005 | |
| Return of various Avon and Dunlop tyres, including their mileage, condition, and position on the vehicle. | 24th Mar 1939 | Box 158 \ 2 scan0006 | |
| Difficulties with tyre mileage and comparing figures for India and Dunlop tyres. | 28th Mar 1939 | Box 158 \ 2 scan0007 | |
| Performance, cost, and supply of Avon tyres in comparison to India and Dunlop tyres for Bentley cars. | 1st Apr 1939 | Box 158 \ 2 scan0008 | |
| Price comparison of Bentley V tyres, size 6.50' x 16', from various makers and a cost saving analysis. | 12th Apr 1939 | Box 158 \ 2 scan0009 | |
| Comparing the costs of tyres for the Bentley V, noting the Avon tyre is a less expensive option. | 12th Apr 1939 | Box 158 \ 2 scan0010 | |
| Cost comparison document for Bentley V tyres from various manufacturers, evaluating 4 ply and 6 ply options. | 21th Apr 1939 | Box 158 \ 2 scan0011 | |
| Responding to a query about the superiority and cost of Avon tyres compared to Dunlop and India tyres. | 21th Apr 1939 | Box 158 \ 2 scan0012 | |
| Secret memorandum regarding the decision to standardise Avon tyres and the need to instruct for necessary moulds. | 4th May 1939 | Box 158 \ 2 scan0013 | |
| Tyre power losses, expressing frustration with Dunlop and comparing the performance of India and Avon tyres. | 18th May 1939 | Box 158 \ 2 scan0014 | |
| Apparatus built to determine power losses in tyres. | 17th May 1939 | Box 158 \ 2 scan0015 | |
| Results of various tyre tests, including rolling circumference and analysis of power losses. | 17th May 1939 | Box 158 \ 2 scan0016 | |
| Tyre performance comparing different brands, pressures, and wear conditions. | 17th May 1939 | Box 158 \ 2 scan0017 | |
| Tyre performance and power losses, comparing Andreau's formula with dynamometer and road test results. | 17th May 1939 | Box 158 \ 2 scan0018 | |
| Report analyzing horsepower losses and comparing maximum lap speeds with various tyre types. | 17th May 1939 | Box 158 \ 2 scan0019 | |
| Comparison of tyre losses for different brands based on maximum speed and dynamometer results. | 17th May 1939 | Box 158 \ 2 scan0020 | |
| Close-up photograph of a vehicle's suspension and wheel assembly in motion. | 2nd May 1939 | Box 158 \ 2 scan0021 | |
| Graph showing tyre losses in horsepower versus speed for various tyre types and pressures. | 2nd May 1939 | Box 158 \ 2 scan0022 | |
| Graph plotting horsepower lost in various tyres against speed in miles per hour. | 2nd May 1939 | Box 158 \ 2 scan0023 | |
| Graph comparing horsepower loss in new versus worn Dunlop Fort tyres at various speeds and pressures under load. | 2nd May 1939 | Box 158 \ 2 scan0024 | |
| Graph comparing horsepower losses in new versus worn tyres under load at various speeds and inflation pressures. | 2nd May 1939 | Box 158 \ 2 scan0025 | |
| Graph showing horsepower losses in India brand tyres at different speeds and inflation pressures. | 2nd May 1933 | Box 158 \ 2 scan0026 | |
| Graph plotting horsepower loss against speed for various new and worn tyres at a specific pressure and load. | 2nd May 1939 | Box 158 \ 2 scan0027 | |
| Graph of road wheel dynamometer power curves for the Bentley V - 7 B.V model. | 3rd May 1939 | Box 158 \ 2 scan0028 | |
| Providing opinions on the fitting of larger 6.50 x 17 tyres on Bentley chassis. | 1st Jun 1939 | Box 158 \ 2 scan0029 | |
| From Rm. to Hs. clarifying the position on tyre suitability and costs, referencing previous correspondence. | 5th Jun 1939 | Box 158 \ 2 scan0030 | |
| Technical explanation of the mechanical causes of rolling resistance in pneumatic tyres. | 5th Jun 1939 | Box 158 \ 2 scan0031 | |
| Mathematical investigation into tyre power loss, including a formula and analysis on a test drum. | 5th Jun 1939 | Box 158 \ 2 scan0032 | |
| Mathematical examination of tyre energy loss, comparing drum and flat road performance, and analysing dynamical losses at high speeds. | 5th Jun 1939 | Box 158 \ 2 scan0033 | |
| Page discussing wall bending losses in tyres on flat roads compared to on test drums. | 5th Jun 1939 | Box 158 \ 2 scan0034 | |
| Analysis of tyre tread bending losses and losses due to the transmission of torque. | 5th Jun 1939 | Box 158 \ 2 scan0035 | |
| Analysis of tyre performance losses due to various forces and a proposal for alternative testing methods. | 5th Jun 1939 | Box 158 \ 2 scan0036 | |
| Methods for measuring tyre rolling losses and resistance, concluding on design benefits. | 5th Jun 1939 | Box 158 \ 2 scan0037 | |
| Purpose and outcome of tyre tests to interpret windage figures and influence a supplier. | 8th Jun 1939 | Box 158 \ 2 scan0038 | |
| Investigations into power losses in tyres, focusing on standing waves at high speeds. | 9th Jun 1939 | Box 158 \ 2 scan0039 | |
| Windage and power losses in rotating wheels, with data on different tyre sizes. | 9th Jun 1939 | Box 158 \ 2 scan0040 | |
| Analysis of power losses related to different tyre types, tyre sizes, and performance in various gears. | 9th Jun 1939 | Box 158 \ 2 scan0041 | |
| Technical memorandum discussing torque effects, tyre losses, and the results of various tyre tests. | 9th Jun 1939 | Box 158 \ 2 scan0042 | |
| Appendix detailing notes on tyre loss results and further areas for investigation. | 9th Jun 1939 | Box 158 \ 2 scan0043 | |
| Road test report for Chassis 7.B.V. detailing acceleration times with different tyre setups. | 9th Jun 1939 | Box 158 \ 2 scan0044 | |
| Graph showing the effect of rear axle loading on horsepower lost in tyres versus speed. | 17th May 1939 | Box 158 \ 2 scan0045 | |
| Graph plotting rear axle torque in lbs ft against vehicle speed in M.P.H. for four different gears. | 17th May 1939 | Box 158 \ 2 scan0046 | |
| Graph showing horsepower losses in tyres at full throttle for each gear. | 17th May 1939 | Box 158 \ 2 scan0047 | |
| Graph showing the effect of tyre size on power loss during dyno drum tests. | 17th May 1939 | Box 158 \ 2 scan0048 | |
| Graph showing the effect of tyre size on power loss during dynamometer tests. | 17th May 1939 | Box 158 \ 2 scan0049 | |
| Graph showing horsepower lost in India tyres at various speeds. | 1st Jun 1939 | Box 158 \ 2 scan0050 | |
| Phenomenon of uneven tyre wear on Wraith models and recommending a solution. | 4th Aug 1939 | Box 158 \ 2 scan0051 | |
| Investigation into complaints of excessive front tyre wear on the Wraith III model. | 11th Aug 1939 | Box 158 \ 2 scan0052 | |
| Toe-in settings and tyre wear for Wraith and Phantom III models. | 11th Aug 1939 | Box 158 \ 2 scan0053 | |
| Customer complaints and potential causes for rapid front tyre wear on the Wraith model. | 17th Aug 1939 | Box 158 \ 2 scan0054 | |
| Front tyre wear and toe-in settings on the Wraith model. | 21th Aug 1939 | Box 158 \ 2 scan0055 | |
| Request to the transport department to arrange for a lorry to collect tubular tyre racks from Shardlow. | 13th Nov 1939 | Box 158 \ 2 scan0056 | |
| Requesting an order for Dunlop and Avon tyres for the Experimental Garage. | 16th Feb 1940 | Box 158 \ 2 scan0057 | |
| Uneven tyre wear on rationalised cars, requesting tow-in checks and future record-keeping. | 27th Mar 1940 | Box 158 \ 2 scan0058 | |
| Internal request to order various sizes of Dunlop Fort Tyres and Tubes for vehicles at the Clan Foundry. | 3rd Sep 1940 | Box 158 \ 2 scan0059 | |
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