| Description | Date | Identifier | |
| Internal order request for six Dunlop medium pressure traction tread tyres. | 18th Jun 1926 | Box 53 \ 2 Scan207 | |
| The testing of 33 x 6.75 Balloon Tyres and correspondence with the Dunlop Co. | 28th Jun 1926 | Box 53 \ 2 Scan208 | |
| Letter to Dunlop Rubber Co Ltd. regarding an order for tyres and requesting a delivery date. | 28th Jun 1926 | Box 53 \ 2 Scan209 | |
| Letter from The Dunlop Rubber Co. confirming a tyre order and discussing tyre standardization on the 40/50 HP model. | 26th Jun 1926 | Box 53 \ 2 Scan210 | |
| The non-recommendation of Dunlop triple studded tyres for chassis 101-TC. | 30th Jun 1926 | Box 53 \ 2 Scan211 | |
| Comparison of road shocks and ride comfort between standard high-pressure tyres and 6.75' Dunlop balloon tyres. | 18th Aug 1926 | Box 53 \ 2 Scan212 | |
| Phantom steering issues, attributing the cause to balloon tyres and suggesting a hydraulic damper. | 8th Aug 1925 | Box 53 \ 2 Scan213 | |
| Recommending the trial and use of low pressure tyres to maintain competitiveness against Bentley, Daimler, and Panhard. | 31th Aug 1926 | Box 53 \ 2 Scan214 | |
| Advantages of fitting large section tyres to improve vehicle suspension and reliability. | 31th Aug 1926 | Box 53 \ 2 Scan215 | |
| Dampers, low-pressure tyres, wobbles, and steering effort, including tyre compatibility with Dunlop rims. | 31th Aug 1926 | Box 53 \ 2 Scan216 | |
| Recommending the trial of large section, low-pressure tyres, citing their use by competitors. | 31th Aug 1926 | Box 53 \ 2 Scan217 | |
| Preliminary steering test results for the 12-EX car, focusing on damper settings and wobble reduction. | 1st Sep 1926 | Box 53 \ 2 Scan218 | |
| Tyre performance, comparing balloon and high-pressure tyres, and analysing the effects of pressure on steering wobble and selectiveness. | 1st Sep 1926 | Box 53 \ 2 Scan219 | |
| Vehicle suspension issues, including insufficient damping, pivot lean, and the effect of oil viscosity. | 2nd Sep 1926 | Box 53 \ 2 Scan220 | |
| Dangers of wheel wobble associated with larger section tyres and the introduction of front brakes. | 2nd Sep 1926 | Box 53 \ 2 Scan221 | |
| Suggestion to fit a car with larger section, low pressure tyres and arranging for testing in Paris. | 2nd Sep 1926 | Box 53 \ 2 Scan222 | |
| Safety risks of wheel wobble at high speeds and plans for testing solutions. | 2nd Sep 1926 | Box 53 \ 2 Scan223 | |
| Fitting a car with larger section, low-pressure tyres for testing in Paris. | 2nd Sep 1926 | Box 53 \ 2 Scan224 | |
| Advantages and disadvantages of fitting low-pressure tyres to Phantom & Goshawk chassis. | 3rd Sep 1926 | Box 53 \ 2 Scan225 | |
| Steering modifications and the adoption of low-pressure tyres for all cars. | 9th Mar 1926 | Box 53 \ 2 Scan226 | |
| Correspondence on low pressure tyres and changing wheels on experimental cars 12-EX and 8-EX. | 4th Sep 1926 | Box 53 \ 2 Scan227 | |
| The return of incorrectly supplied tyres. | 6th Sep 1926 | Box 53 \ 2 Scan228 | |
| Return of 4 incorrect covers measuring 33' x 6.00'. | 6th Sep 1926 | Box 53 \ 2 Scan229 | |
| Incorrect tyre delivery from Dunlop and the proposed replacement alternatives. | 7th Sep 1926 | Box 53 \ 2 Scan230 | |
| From Hs. to ROY. regarding a supply issue with Dunlop for 6.75' traction tread tyres. | 1st Sep 1926 | Box 53 \ 2 Scan231 | |
| Supply issue with Dunlop for 6.75' traction tread tyres for 21' rims. | 3rd Sep 1926 | Box 53 \ 2 Scan232 | |
| On testing 6.75 inch balloon tyres, comparing their performance regarding high-speed wobble and comfort against older 6.00 inch tyres. | 9th Sep 1926 | Box 53 \ 2 Scan233 | |
| Commentary on repeating car tests for Continental roads. | 14th Sep 1926 | Box 53 \ 2 Scan234 | |
| Visit to the Dunlop Co. in Birmingham to discuss modifications to triple stud tyres and information on balloon tyres. | 14th Sep 1926 | Box 53 \ 2 Scan235 | |
| Report comparing the performance of Dunlop triple stud tread tyres against traction tread tyres, focusing on high-speed wobbles. | 10th Sep 1926 | Box 53 \ 2 Scan236 | |
| Results of testing three different tyre sizes in France to understand high-speed wobbles. | 10th Sep 1926 | Box 53 \ 2 Scan237 | |
| Trial and procurement of 6.75' Dunlop triple stud tyres. | 14th Sep 1926 | Box 53 \ 2 Scan238 | |
| Letter from Dunlop Rubber Co. Ltd. discussing testing and modifications for a new triple stud tyre. | 16th Sep 1926 | Box 53 \ 2 Scan239 | |
| Continuation sheet of a letter from Dunlop Rubber Co. Ltd. regarding tyre wobble and non-skid properties. | 15th Sep 1926 | Box 53 \ 2 Scan240 | |
| Letter to Dunlop Rubber Co. Ltd. regarding high-speed wobble issues with triple stud tread tyres. | 15th Sep 1926 | Box 53 \ 2 Scan241 | |
| Procurement of modified 33 x 6.75 tyres and communications with the Dunlop Rubber Company. | 20th Sep 1926 | Box 53 \ 2 Scan242 | |
| Conversion of 6.75' tyres to a new triple stud pattern by Dunlop and the resulting objections and concerns. | 21th Sep 1926 | Box 53 \ 2 Scan243 | |
| Tyre supply issues for well-based wheels and engagement with Dunlop on high-speed wobble problems. | 21th Sep 1926 | Box 53 \ 2 Scan244 | |
| Letter to the Dunlop Rubber Co. Ltd. requesting tyre performance data and availability of large section inner tubes. | 21th Sep 1926 | Box 53 \ 2 Scan245 | |
| The use of Dunlop 6.75' traction tread tyres and their performance characteristics. | 22th Sep 1926 | Box 53 \ 2 Scan246 | |
| Letter from Dunlop Rubber Co. Ltd. regarding a chart showing the increase in effective diameter of a tyre at high speed. | 22th Sep 1926 | Box 53 \ 2 Scan247 | |
| Graph plotting the increase in a Dunlop tyre's effective radius against speed. | 22th Sep 1926 | Box 53 \ 2 Scan248 | |
| Letter from Dunlop Rubber Co. Ltd. concerning the supply and delivery timescale for 33 x 6.75 tyres. | 22th Sep 1926 | Box 53 \ 2 Scan249 | |
| Letter to the Dunlop Rubber Co. Ltd. regarding a graph of tyre diameter and the pending delivery of large section inner tubes. | 23th Sep 1926 | Box 53 \ 2 Scan250 | |
| Letter to the Dunlop Rubber Co. requesting figures for the rolling resistance of balloon and high-pressure tyres. | 25th Sep 1926 | Box 53 \ 2 Scan251 | |
| Letter from Dunlop Rubber Co. Ltd. regarding a delay in providing requested test information. | 27th Sep 1926 | Box 53 \ 2 Scan252 | |
| Letter to Dunlop Rubber Co. Ltd. concerning poor tyre life experienced in hot weather and requesting comparative figures. | 30th Sep 1926 | Box 53 \ 2 Scan253 | |
| Letter from Dunlop detailing the results of rolling resistance tests on two different tyre types. | 1st Oct 1926 | Box 53 \ 2 Scan254 | |
| Letter from Dunlop Rubber Co. Ltd. detailing the results and methodology of tyre rolling resistance tests. | 1st Oct 1926 | Box 53 \ 2 Scan255 | |
| Graph plotting machine tests of rolling resistance against inflation pressure for two different tyre types. | 1st Oct 1926 | Box 53 \ 2 Scan256 | |
| Graph of road rolling resistance tests, plotting inflation pressure against distance rolled for two tyre sizes. | 4th Oct 1926 | Box 53 \ 2 Scan257 | |
| Trial of 33 x 6.75 inner tubes supplied by the Dunlop Co. | 4th Oct 1926 | Box 53 \ 2 Scan258 | |
| Inquiry about the availability of 6.75 inch balloon tyres with traction tread. | 5th Oct 1926 | Box 53 \ 2 Scan259 | |
| Letter to The Dunlop Rubber Co. chasing the delivery of heavy inner tubes for high-speed wobble tests. | 5th Oct 1926 | Box 53 \ 2 Scan260 | |
| Letter from Dunlop Rubber Co. providing data on tyre wear rates and mileage performance for different tyre sizes and seasons. | 6th Oct 1926 | Box 53 \ 2 Scan261 | |
| Letter from Dunlop confirming the despatch of heavy inner tubes for wheel wobble tests. | 6th Oct 1926 | Box 53 \ 2 Scan262 | |
| Effects of low-pressure tyres on the steering of Phantom experimental cars. | 6th Oct 1926 | Box 53 \ 2 Scan263 | |
| Tyre mileage in different weather conditions and the reliability of low-pressure tyres. | 6th Oct 1926 | Box 53 \ 2 Scan264 | |
| Letter from Dunlop Rubber Co. providing data on tyre wear rates and the effect of seasonal conditions. | 7th Oct 1926 | Box 53 \ 2 Scan265 | |
| The expected delivery of special experimental inner tubes from Dunlop to the Experimental Department. | 7th Oct 1926 | Box 53 \ 2 Scan266 | |
| Testing and implementation of low pressure tyres on Phantom models. | 7th Oct 1926 | Box 53 \ 2 Scan267 | |
| Fitting of a fractional or similar device to the steering of chassis 103-MC equipped with low-pressure tyres. | 1st Oct 1926 | Box 53 \ 2 Scan268 | |
| Requesting the Paris office to source six 6.75' traction tread tyres for testing. | 1st Oct 1926 | Box 53 \ 2 Scan269 | |
| Letter to Dunlop Rubber Co. Ltd. regarding inner tubes and high-speed wobble experiments. | 8th Oct 1926 | Box 53 \ 2 Scan270 | |
| Post Office Telegraph sent from Paris to Derby. | 9th Oct 1925 | Box 53 \ 2 Scan271 | |
| Confirming the availability and delivery delay of specific 'Dunlop' well-based tyres from Paris. | 9th Oct 1926 | Box 53 \ 2 Scan272 | |
| Conference memo regarding testing and specifications for low pressure tyres and axle setups on Phantom models. | 8th Oct 1926 | Box 53 \ 2 Scan273 | |
| From BJ with instructions for PN and CWB to test a car with a heavy closed body in London and then France. | 1st Oct 1926 | Box 53 \ 2 Scan274 | |
| The availability and delivery delay for 6.75' Dunlop traction tread tyres. | 12th Oct 1926 | Box 53 \ 2 Scan275 | |
| Steering fault discovered during medium pressure tyre tests in France, and arranging for further high-speed and traffic tests. | 1st Oct 1926 | Box 53 \ 2 Scan276 | |
| To standardise the terminology used for Low and Medium Pressure tyres to avoid customer misunderstanding. | 22th Oct 1926 | Box 53 \ 2 Scan277 | |
| Inquiry to Dunlop about tyre availability for 40/50 HP and 20 HP cars and experiments with heavy inner tubes to cure high-speed wobbles. | 23th Oct 1926 | Box 53 \ 2 Scan278 | |
| Comparing low and medium pressure tyre sections and proposing new standard sizes for the Phantom and 20 HP models. | 23th Oct 1926 | Box 53 \ 2 Scan279 | |
| The collection or delivery of balloon tyres for chassis 88-LO. | 27th Oct 1926 | Box 53 \ 2 Scan280 | |
| Instruction leaflet for low pressure tyres on the Phantom chassis. | 28th Oct 1925 | Box 53 \ 2 Scan281 | |
| Phantom tyres, high-speed wobbles, and the need for more information in the instruction book. | 29th Oct 1926 | Box 53 \ 2 Scan282 | |
| Effects of low-pressure tyres on the steering and performance of the 40/50 HP model. | 29th Oct 1926 | Box 53 \ 2 Scan283 | |
| Tyre manufacturing defects causing vibration and steering issues. | 5th Nov 1926 | Box 53 \ 2 Scan284 | |
| Alternative tyre makes for 21' rims and providing information on traction tread tyre wear. | 5th Nov 1926 | Box 53 \ 2 Scan285 | |
| Requesting an order for six traction tread tyres from Messrs. Dunlops. | 11th Nov 1926 | Box 53 \ 2 Scan286 | |
| Steering tests for the 12-EX model, focusing on wobble issues under various tyre pressures and conditions. | 15th Nov 1926 | Box 53 \ 2 Scan287 | |
| Technical memo discussing the steering and suspension setup for a new lightened axle with balloon tyres. | 19th Nov 1926 | Box 53 \ 2 Scan288 | |
| Continued note on tyre performance relating non-skid treads and tyre section to wheel wobble. | 19th Nov 1926 | Box 53 \ 2 Scan289 | |
| Fitting of 6' tyres on a 20 HP car. | 19th Nov 1926 | Box 53 \ 2 Scan290 | |
| Testing of 6' tyres on a 20 HP car and the risk of wobbles on models with front wheel brakes. | 22th Nov 1926 | Box 53 \ 2 Scan291 | |
| Covering memo enclosing a copy of a document concerning tyres. | 26th Nov 1926 | Box 53 \ 2 Scan292 | |
| Letter concerning the probable adoption of new large section tire and wheel sizes, and the discarding of old sizes. | 15th Nov 1926 | Box 53 \ 2 Scan293 | |
| Letter from The Seiberling Rubber Company regarding experimentation with smaller wheel diameters and new tire sizes. | 4th Sep 1926 | Box 53 \ 2 Scan294 | |
| Wheel balancing tests for 33 x 6.75' tyres, focusing on inner tube joint placement. | 26th Nov 1926 | Box 53 \ 2 Scan295 | |
| Wheel balancing issues caused by the position of the inner tube joint relative to the valve. | 27th Nov 1926 | Box 53 \ 2 Scan296 | |
| Explaining the decision to standardise 5¼' tyres on the 20 HP model. | 27th Nov 1926 | Box 53 \ 2 Scan297 | |
| Performance data sheet comparing 33 inch solid tyres with standard S.S. tyres. | 30th Nov 1926 | Box 53 \ 2 Scan298 | |
| Performance data table for 33 X 6.75 inch tyres at 35 lbs/sq.in pressure. | 29th Nov 1926 | Box 53 \ 2 Scan299 | |
| Standardisation of 6.75' traction tread well base rims on old type axle. | 29th Nov 1926 | Box 53 \ 2 Scan300 | |
| Standardisation sheet memo regarding the cost of 6.75 traction well base wheels and tyres for chassis with hydraulic dampers. | 10th Dec 1926 | Box 53 \ 2 Scan301 | |
| Fitting balloon tyres and hydraulic shock absorbers to a Phantom car, warning of high-speed wobbles. | 8th Dec 1928 | Box 53 \ 2 Scan302 | |
| Index page for a report on the fundamentals of car performance, specifically related to tyres. | 6th Jan 1927 | Box 53 \ 3 Scan001 | |
| The fundamentals of car performance, focusing on the effect of tyres on steering. | 6th Jan 1927 | Box 53 \ 3 Scan002 | |
| High-speed wobbles, focusing on the effects of tyre pressure and tyre size. | 6th Jan 1927 | Box 53 \ 3 Scan003 | |
| High-speed wobbles (shimmy), focusing on tyre tread pattern, irregular tyre wear, and rear tyre inflation pressure. | 6th Jan 1927 | Box 53 \ 3 Scan004 | |
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