| Description | Date | Identifier | |
| Dunlop wheels, straight-sided tyres, and the requirement for a mechanical tyre pump. | 30th Apr 1920 | Box 45 \ 1 Scan007 | |
| Request to test Dunlop straight-sided tyres, with a critique of their stiffness compared to American tyres. | 5th May 1920 | Box 45 \ 1 Scan008 | |
| Letter to Dunlop Rubber Co. Ltd. regarding the testing of their straight-sided tyres and comparing their stiffness to American-made tyres. | 5th May 1920 | Box 45 \ 1 Scan009 | |
| Page two of a letter discussing tyre testing and enclosing an experimental report. | 3rd May 1920 | Box 45 \ 1 Scan010 | |
| Whether to continue accepting orders for Warland Dual Rims due to the upcoming availability of Dunlop wire wheels. | 4th May 1920 | Box 45 \ 1 Scan011 | |
| Michelin Co.'s position on manufacturing straight-sided (wired-on) tyres versus beaded tyres. | 5th May 1920 | Box 45 \ 1 Scan012 | |
| Supply of Dunlop straight-sided tyres and wheels for testing in the experimental department. | 7th May 1920 | Box 45 \ 1 Scan013 | |
| Letter from The Dunlop Rubber Co. Ltd. concerning the testing of their straight-sided tyres. | 6th May 1920 | Box 45 \ 1 Scan014 | |
| Modifications to Michelin disc wheels to make them practicable. | 8th May 1920 | Box 45 \ 1 Scan015 | |
| The re-testing of Dunlop straight-sided tyres and the arrangement of an interview. | 8th May 1920 | Box 45 \ 1 Scan016 | |
| Letter from The Dunlop Rubber Co. Ltd. concerning the testing of their straight-sided tyres. | 7th May 1920 | Box 45 \ 1 Scan017 | |
| Letter regarding a proposed test of straight-sided tyres and rims. | 8th May 1920 | Box 45 \ 1 Scan018 | |
| Finality on the question of wheels, rims, and straight-sided tyres, including the introduction of a mechanical tyre pump. | 12th May 1920 | Box 45 \ 1 Scan019 | |
| Copy of a letter regarding the supply of straight-sided tyres and rims from Goodyear Tyre & Rubber Co. | 12th May 1920 | Box 45 \ 1 Scan020 | |
| Supply and fitting of demountable rims, straight-sided tyres, and mechanical tyre pumps. | 17th May 1920 | Box 45 \ 1 Scan021 | |
| Comparison of Firestone, Stanwell, and Goodyear demountable rims for straight-sided tyres, covering weight and ease of use. | 19th May 1920 | Box 45 \ 1 Scan022 | |
| Safety comparison of Stanwell, Goodyear, and Firestone wheel rims on a car with a deflated tyre. | 19th May 1920 | Box 45 \ 1 Scan023 | |
| The merits and standardisation of Firestone, Goodyear, and Dunlop tyre rims. | 9th May 1920 | Box 45 \ 1 Scan024 | |
| Letter to The Dunlop Rubber Co. Ltd. regarding a proposed meeting and their production schedule for wheels. | 19th May 1920 | Box 45 \ 1 Scan025 | |
| Meeting with the Dunlop Company concerning straight sided tyres and loose flange wheels. | 27th May 1920 | Box 45 \ 1 Scan026 | |
| Paint color samples, chassis painting, and wheel/tyre options for a car. | 7th Jun 1920 | Box 45 \ 1 Scan027 | |
| The testing of Dunlop straight-sided tyres and loose flanged wheels on a chassis rear axle. | 7th Jun 1920 | Box 45 \ 1 Scan028 | |
| Letter from Dunlop Rubber Co. Ltd. outlining the conditions for testing their Straight Side Tyres. | 4th Jun 1920 | Box 45 \ 1 Scan029 | |
| Letter from Dunlop Rubber Co. Ltd. outlining conditions and procedures for tyre testing. | 19th Feb 1920 | Box 45 \ 1 Scan030 | |
| Proposal to introduce a new type of wire wheel suitable for straight-sided tyres as part of the postwar programme. | 9th Jun 1920 | Box 45 \ 1 Scan031 | |
| Testing of straight-sided tyres and correspondence with the Dunlop Rubber Co. | 11th Jun 1920 | Box 45 \ 1 Scan032 | |
| Whether to supply forgings for Michelin disc wheels to the USA, recommending that experimental work be kept in Derby. | 11th Jun 1920 | Box 45 \ 1 Scan033 | |
| Cancellation of Michelin wheel forgings due to accidents with soft bead clincher tyres. | 25th May 1920 | Box 45 \ 1 Scan034 | |
| Request for sample wheel hub forgings to be produced in England for testing American Michelin disc wheels. | 11th Jun 1920 | Box 45 \ 1 Scan035 | |
| The testing of straight-sided tyres and correspondence with the Dunlop Rubber Co. | 11th Jun 1920 | Box 45 \ 1 Scan036 | |
| Letter from The Dunlop Rubber Co. Ltd. regarding a set of 5 wheels and tyres sent for testing. | 9th Jun 1920 | Box 45 \ 1 Scan037 | |
| Wheel and tyre choices (wire wheels vs disc wheels) and paint colour options for chassis 6.EX. | 14th Jun 1920 | Box 45 \ 1 Scan038 | |
| Letter to The Dunlop Rubber Company attaching a report on tyres loaned for testing. | 21th Jun 1920 | Box 45 \ 1 Scan039 | |
| Test log for Dunlop straight-sided tyres detailing daily mileage and routes taken. | 20th Jun 1920 | Box 45 \ 1 Scan040 | |
| Letter from Dunlop to Rolls-Royce regarding a report on the running of Test Tyres. | 22th Jun 1920 | Box 45 \ 1 Scan041 | |
| Discrepancy in spare wheels supplied by Dunlop Rubber Co. | 24th Jun 1920 | Box 45 \ 1 Scan042 | |
| Letter from Dunlop Rubber Co Ltd regarding the testing of S/S tyres. | 24th Jun 1920 | Box 45 \ 1 Scan043 | |
| The use of Goodyear Tyres on a 4.EX Car with a 40/50 HP engine. | 29th Jun 1920 | Box 45 \ 1 Scan044 | |
| Letter to the Dunlop Rubber Co. regarding scheduling a car for tyre inspection and an upcoming works holiday. | 28th Jun 1920 | Box 45 \ 1 Scan045 | |
| Test report on Dunlop straight-sided tyres for the week ending 27th June 1920. | 27th Jun 1920 | Box 45 \ 1 Scan046 | |
| Letter from Dunlop Rubber Co Ltd to Mr. Hives confirming arrangements for sending a car to Birmingham. | 29th Jun 1920 | Box 45 \ 1 Scan047 | |
| Relationship between axle ratios, tyre sizes, and car speed. | 30th Jun 1920 | Box 45 \ 1 Scan048 | |
| The standardization of wheels and the introduction of straight-sided tyres. | 15th Jul 1920 | Box 45 \ 1 Scan049 | |
| Supply and design options for various types of wheels, including wire, Michelin disc, and Dunlop disc. | 15th Jul 1920 | Box 45 \ 1 Scan050 | |
| Continuation page of a typed report or memorandum, marked as page 3. | 15th Jul 1920 | Box 45 \ 1 Scan051 | |
| Standardisation and supply of straight-sided tyres and the phasing out of Warland rims. | 15th Jul 1920 | Box 45 \ 1 Scan052 | |
| Wheel supply strategy concerning wire wheels, disc wheels, and negotiations with suppliers like Dunlop and Michelin. | 15th Jul 1920 | Box 45 \ 1 Scan053 | |
| Referencing a previous memo about Michelin disc wheels and straight-sided tyres. | 15th Jul 1920 | Box 45 \ 1 Scan054 | |
| Recommending Michelin disc wheels as an alternative for customers who dislike wire wheels. | 21th Jul 1920 | Box 45 \ 1 Scan055 | |
| Letter to Dunlop Rubber Co. arranging for the examination of an experimental car fitted with straight-sided tyres. | 21th Jul 1920 | Box 45 \ 1 Scan056 | |
| Test report on Dunlop straight-sided tyres for the week ending 3rd July. | 3rd Jul 1920 | Box 45 \ 1 Scan057 | |
| Inquiry to Messrs. Rudge-Whitworth regarding the demountable rims used with their detachable wire wheels. | 22th Jul 1920 | Box 45 \ 1 Scan058 | |
| Letter from Dunlop regarding the condition of test tyres on a vehicle. | 24th Jul 1920 | Box 45 \ 1 Scan059 | |
| Company's policy on supplying different types of wheels, including Warland rims and Michelin disc wheels. | 28th Jul 1920 | Box 45 \ 1 Scan060 | |
| The production implications of fitting Michelin disc wheels versus wire wheels with loose flanges. | 28th Jul 1920 | Box 45 \ 1 Scan061 | |
| The issues with running high-pressure Dunlop tyres, including poor ride comfort and road holding. | 30th Jul 1920 | Box 45 \ 1 Scan062 | |
| Radii at the base of wheel flanges for straight-sided tyres. | 2nd Aug 1920 | Box 45 \ 1 Scan063 | |
| Letter to The Dunlop Co. Ltd. regarding a mileage report and premature tyre wear, suggesting lower pressure as a remedy. | 3rd Aug 1920 | Box 45 \ 1 Scan064 | |
| Log sheet detailing tests on Dunlop straight-sided tyres for the week ending 2nd August. | 2nd Aug 1920 | Box 45 \ 1 Scan065 | |
| Letter from Dunlop Rubber Co Ltd regarding the testing of tyres and inflation pressures. | 4th Aug 1920 | Box 45 \ 1 Scan066 | |
| Letter from Dunlop to Rolls-Royce regarding a mileage discrepancy in a tyre test. | 5th Aug 1920 | Box 45 \ 1 Scan067 | |
| Letter to The Dunlop Rubber Co. Ltd. regarding a correction to a previous report on tyres. | 6th Aug 1920 | Box 45 \ 1 Scan068 | |
| 300-mile road test of a vehicle, detailing performance, handling, and fuel/tyre economy. | 10th Aug 1920 | Box 45 \ 1 Scan069 | |
| Letter to The Dunlop Rubber Co. concerning reports on tyres. | 18th Aug 1920 | Box 45 \ 1 Scan070 | |
| Test report on Dunlop straight-sided tyres for the week ending 8th August 1920. | 8th Aug 1920 | Box 45 \ 1 Scan071 | |
| Log of tests performed on Dunlop straight-sided tyres for the week ending 15th August 1920. | 15th Aug 1920 | Box 45 \ 1 Scan072 | |
| Performance of new straight-sided tyres, and the difficulty of removing them from the rim after a puncture. | 20th Aug 1920 | Box 45 \ 1 Scan073 | |
| The quality of tyres and rims, comparing Palmer tyres and Goodyer rims to other manufacturers. | 20th Aug 1920 | Box 45 \ 1 Scan074 | |
| Letter from Dunlop confirming receipt of tyre mileage reports and enclosing new printed forms for future reporting. | 20th Aug 1920 | Box 45 \ 1 Scan075 | |
| Customer complaints about poor ride quality due to hard tyres and high tyre pressures. | 1st Sep 1920 | Box 45 \ 1 Scan076 | |
| Tyre pressure experiments, their effect on comfort, and mileage. | 1st Sep 1920 | Box 45 \ 1 Scan077 | |
| Tyre pressure recommendations, fitting tightness, tread patterns, and noise issues. | 1st Sep 1920 | Box 45 \ 1 Scan078 | |
| Page from a report discussing the noise characteristics of Wood Milne tyres. | 1st Sep 1920 | Box 45 \ 1 Scan079 | |
| Letter to Dunlop Rubber Co. Ltd. regarding the supply of Magnum straight-sided wired-on tyres. | 2nd Sep 1920 | Box 45 \ 1 Scan080 | |
| Letter to Dunlop Rubber Co. Ltd. concerning tyre mileage reports. | 2nd Sep 1920 | Box 45 \ 1 Scan081 | |
| Test report on Dunlop straight-sided tyres, tracking mileage, routes, and remarks including a failure. | 21th Aug 1920 | Box 45 \ 1 Scan082 | |
| Weekly test report on Dunlop straight-sided tyres, recording mileage, routes, and road conditions. | 29th Aug 1920 | Box 45 \ 1 Scan083 | |
| Log sheet detailing tests on Dunlop straight-sided tyres, tracking mileage and performance. | 4th Sep 1920 | Box 45 \ 1 Scan084 | |
| Total mileage report for tyres, detailing a replacement and mileage covered. | 14th Sep 1920 | Box 45 \ 1 Scan085 | |
| Letter from Dunlop regarding tyre mileage reports and the preference for using the usual reporting forms. | 4th Sep 1920 | Box 45 \ 1 Scan086 | |
| Complaints about present production cars, focusing on American tyres and driver perception. | 7th Sep 1920 | Box 45 \ 1 Scan087 | |
| Steering faults, tracing 'steering wobbles' to tyres and proposing friction dampers as a cure. | 9th Sep 1920 | Box 45 \ 1 Scan088 | |
| High-speed steering, wheel types, transmission knock, and suspension. | 7th Sep 1920 | Box 45 \ 1 Scan089 | |
| Report discussing spring lubrication, transmission design, and electrical installation plans. | 29th Jul 1920 | Box 45 \ 1 Scan090 | |
| Letter to Dunlop Rubber Co. Ltd. attaching tyre mileage reports for specified weeks. | 21th Sep 1920 | Box 45 \ 1 Scan091 | |
| Log sheet detailing tests on Dunlop straight-sided tyres for the week ending 12th September 1920. | 12th Sep 1920 | Box 45 \ 1 Scan092 | |
| Test report on Dunlop straight-sided tyres for the week ending 19th September. | 19th Sep 1920 | Box 45 \ 1 Scan093 | |
| Tests conducted on a 6.EX car to find the effect of rear shock absorbers with different tyre pressures. | 22th Sep 1920 | Box 45 \ 1 Scan094 | |
| The testing of rear shock absorbers, noting issues with noise and proposals for improvements using Ferodo discs. | 22th Sep 1920 | Box 45 \ 1 Scan095 | |
| The supply of Dunlop straight-sided wired-on tyres and suitable wheels. | 23th Sep 1920 | Box 45 \ 1 Scan096 | |
| Supply chain and delivery timeline for Dunlop straight-side wired-on tyres and wheels. | 23th Sep 1920 | Box 45 \ 1 Scan097 | |
| Letter from Dunlop Rubber Co. Ltd. regarding a delay in the supply of Straight Side Tyres. | 20th Sep 1920 | Box 45 \ 1 Scan098 | |
| Letter from Dunlop Rim & Wheel Co. regarding the supply of Magnum straight-sided wired-on tyres. | 22th Sep 1920 | Box 45 \ 1 Scan099 | |
| Change to wire wheels for straight-sided tyres. | 24th Sep 1920 | Box 45 \ 1 Scan100 | |
| Instructions regarding the end of the 'N' series with Dunlop wheels and the potential standardisation of straight-sided tyres. | 24th Sep 1920 | Box 45 \ 1 Scan101 | |
| From Mr. Royce to C.J. regarding the testing and performance of experimental production cars, including model 1.EX. | 26th Sep 1920 | Box 45 \ 1 Scan102 | |
| Improving vehicle ride quality through changes in tyres, springs, and axle ratios. | 26th Sep 1920 | Box 45 \ 1 Scan103 | |
| The performance of the Hawk aero engine, noting issues at slow speed and suggesting improvements to suspension and electrics. | 26th Sep 1920 | Box 45 \ 1 Scan104 | |
| Cover letter to The Dunlop Rubber Co., Ltd. attaching a report on tyre mileage for the attention of Mr. Walter Bond. | 30th Sep 1920 | Box 45 \ 1 Scan105 | |
| Test report on Dunlop straight-sided tyres for the week ending 26th September. | 26th Sep 1920 | Box 45 \ 1 Scan106 | |
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