| Description | Date | Identifier | |
| Potential testing of Englebert tyres, claimed to be superior to Dunlop tyres. | 20th May 1921 | Box 157 \ 4 scan0009 | |
| Cost of Englebert tyres for testing and comparing the terms to an existing arrangement with Dunlop. | 1st Jun 1921 | Box 157 \ 4 scan0010 | |
| Letter from Englebert Tyres Ltd. offering a discount on old stock tyres for testing purposes. | 4th Jun 1921 | Box 157 \ 4 scan0011 | |
| Letter from Englebert Tyres Limited offering a 45% discount and detailing available tyre stock. | 7th Jun 1921 | Box 157 \ 4 scan0012 | |
| Letter to Englebert Tyres Ltd. declining to pay for tyres for testing and noting a preference for straight sided tyres over the obsolete Clincher pattern. | 7th Jun 1921 | Box 157 \ 4 scan0013 | |
| Letter from Englebert Tyres Ltd regarding a misunderstanding over a free set of tyres and the subsequent issuing of a credit note. | 9th Jun 1921 | Box 157 \ 4 scan0014 | |
| Requesting a report on an enclosed letter from the Managing Director of Englebert Tyres Ltd. | 10th Jun 1921 | Box 157 \ 4 scan0015 | |
| Letter from Englebert Tyres Ltd. confirming the supply of free tyres for testing and hoping for future orders. | 9th Jun 1921 | Box 157 \ 4 scan0016 | |
| Declining an offer for Englebert tyres due to sufficient stock and upcoming standardization of straight-sided tyres. | 11th Jun 1921 | Box 157 \ 4 scan0017 | |
| Letter from Englebert Tyres Ltd. inquiring about the specific size of Straight Sided Tyres required. | 13th Jun 1921 | Box 157 \ 4 scan0018 | |
| Letter to Englebert Tyres Ltd. reporting on the performance of their tyres after 1000 miles of testing. | 8th Jul 1921 | Box 157 \ 4 scan0019 | |
| Letter from Englebert Tyres Ltd. discussing tyre sizes and the preparation of a special tyre. | 9th Jul 1921 | Box 157 \ 4 scan0020 | |
| Letter to Englebert Tyre Co. clarifying tyre sizes and inquiring if their cord tyres are straight-sided or beaded edge. | 11th Jul 1921 | Box 157 \ 4 scan0021 | |
| Letter from Englebert Tyres Ltd. discussing the production of straight-sided versus beaded edge tyres. | 12th Jul 1921 | Box 157 \ 4 scan0022 | |
| Instructing the Stores to despatch a test tyre to Englebert Tyres Ltd. | 8th Aug 1921 | Box 157 \ 4 scan0023 | |
| Letter to Englebert Tyres Ltd. regarding the return of a burst tyre and mileage feedback. | 12th Aug 1921 | Box 157 \ 4 scan0024 | |
| Instruction sheet detailing mileage records for Englebert tyres. | 14th Sep 1921 | Box 157 \ 4 scan0025 | |
| Instruction sheet detailing the mileage and condition of Englebert tyres. | 14th Sep 1921 | Box 157 \ 4 scan0026 | |
| Log detailing the status and placement of Engellert tyres. | 16th Feb 1922 | Box 157 \ 4 scan0027 | |
| The status of Englebert Tyres sent for testing. | 16th Feb 1922 | Box 157 \ 4 scan0028 | |
| Requesting an update on five tyres sent for testing by Mr. Muhlenkamp of the Englebert Tyre Company. | 10th Feb 1922 | Box 157 \ 4 scan0029 | |
| Covering note attaching a letter concerning 'Englebert' tyres. | 10th Mar 1922 | Box 157 \ 4 scan0030 | |
| Letter to Englebert Tyres Ltd. detailing the results of tyre tests, comparing cord and canvas constructions. | 10th Mar 1922 | Box 157 \ 4 scan0031 | |
| Test results for Englebert tyres, detailing mileage until failure on a 40/50 HP car. | 10th Mar 1922 | Box 157 \ 4 scan0032 | |
| Follow-up letter regarding the testing of Englebert Tyres. | 10th Mar 1922 | Box 157 \ 4 scan0033 | |
| Letter from Englebert Tyres Ltd. acknowledging a report on their tyres. | 13th Mar 1922 | Box 157 \ 4 scan0034 | |
| Comparing the performance of Englebert tyres against Dunlop tyres. | 30th Oct 1930 | Box 157 \ 4 scan0035 | |
| Comparative performance of Englebert and Dunlop tyres, and suggesting further testing. | 31th Oct 1930 | Box 157 \ 4 scan0036 | |
| Use of American-manufactured wood wheels and a request for rims and tyres. | 29th Sep 1919 | Box 157 \ 5 scan0001 | |
| List of demountable rims and tyres sent from the USA for experimental work. | 30th Jan 1920 | Box 157 \ 5 scan0002 | |
| Control issues with Goodyear tyres when fitted to the rear of a car. | 16th Feb 1920 | Box 157 \ 5 scan0003 | |
| Driver's report from Le Canadel, France, detailing tyre sourcing, high-speed performance, steering feel, and engine piston rattle. | 20th Feb 1920 | Box 157 \ 5 scan0004 | |
| Analysis of unsatisfactory steering, attributing it to tyre design and lack of shock dampers rather than split rear springs. | 6th Aug 1919 | Box 157 \ 5 scan0005 | |
| Steering and springing tests on a 40/50 chassis, investigating instability issues with Michelin Disc Wheels. | 20th Feb 1920 | Box 157 \ 5 scan0006 | |
| Report comparing the steering performance of cars fitted with Goodyear and Dunlop tyres. | 20th Feb 1920 | Box 157 \ 5 scan0007 | |
| Testing split versus solid springs and their effect on steering stability and ride quality. | 20th Feb 1920 | Box 157 \ 5 scan0008 | |
| Advising of a stock-out of 895 x 150 tyres from Goodyear Tyre & Rubber Co. and a new despatch date. | 24th Feb 1920 | Box 157 \ 5 scan0009 | |
| The delay in obtaining Goodyear tyres for the American Chassis. | 1st Mar 1920 | Box 157 \ 5 scan0010 | |
| Letter from Goodyear confirming the arrival of tyres and rims and awaiting delivery instructions. | 9th Mar 1920 | Box 157 \ 5 scan0011 | |
| Recommendation to purchase Goodyear tyres and rims based on satisfactory experience with the demountable rim. | 15th Mar 1920 | Box 157 \ 5 scan0012 | |
| Confirming the receipt of springs, locking rings, rims, outer covers, and inner tubes from suppliers. | 29th Mar 1920 | Box 157 \ 5 scan0013 | |
| Arrangements with Goodyear for the supply and testing of straight-sided tyres and rims. | 12th May 1920 | Box 157 \ 5 scan0014 | |
| Tyre performance, including pressure, fitting tightness, tread patterns, and noise issues. | 1st Sep 1920 | Box 157 \ 5 scan0015 | |
| Continued report on tyre noise, mentioning that Wood Milne tyres are particularly bad. | 1st Sep 1920 | Box 157 \ 5 scan0016 | |
| Extract concerning an earthed wiring scheme and obtaining dynamo brushes. | 3rd Sep 1920 | Box 157 \ 5 scan0017 | |
| Request for arguments to use against Goodyear diamond tread tyres following a conference. | 30th Sep 1920 | Box 157 \ 5 scan0018 | |
| Customer complaint about Goodyear diamond tread tyres affecting vehicle steering. | 6th Oct 1920 | Box 157 \ 5 scan0019 | |
| Complaint regarding Goodyear tyres causing the car to move sideways, making it difficult to keep straight. | 11th Oct 1920 | Box 157 \ 5 scan0020 | |
| Cost of a set of four Dunlop, Goodyear, and Goodrich tyres. | 22th Feb 1921 | Box 157 \ 5 scan0021 | |
| Comparing Goodyear straight-sided tyres with diamond stud clincher tyres regarding car handling. | 31th Mar 1921 | Box 157 \ 5 scan0022 | |
| Letter from Goodyear Tyre & Rubber Company requesting an appointment with Mr. Hives. | 27th Aug 1921 | Box 157 \ 5 scan0023 | |
| Letter to Goodyear Tyre & Rubber Co. regarding a requested appointment for Mr. E.R. Preston. | 30th Aug 1921 | Box 157 \ 5 scan0024 | |
| Letter from Goodyear Tyre & Rubber Company regarding the testing of Straight Side cord Tyres. | 5th Sep 1921 | Box 157 \ 5 scan0025 | |
| Design flaw in Goodyear detachable rims allowing water penetration and rust. | 5th Sep 1921 | Box 157 \ 5 scan0026 | |
| Design proposal for a wheel rim spring ring gap to prevent water from getting under the tyre. | 29th Sep 1921 | Box 157 \ 5 scan0027 | |
| Letter to the Dunlop Rubber Co. Ltd. detailing tyre pressure test results and recommendations for cord tyres. | 29th Sep 1921 | Box 157 \ 5 scan0028 | |
| Offer to send a car to demonstrate the difference in ride comfort with various tyre pressures. | 10th Dec 1920 | Box 157 \ 5 scan0029 | |
| Letter to Goodyear regarding tyre pressure tests and recommendations for straight-sided cord tyres. | 30th Sep 1921 | Box 157 \ 5 scan0030 | |
| Ink impression of a well-worn Goodyear tyre tread from a chassis front wheel. | 1st Aug 1923 | Box 157 \ 5 scan0031 | |
| Steering wobble issues caused by Goodyear tyres on the New Phantom chassis. | 29th Sep 1926 | Box 157 \ 5 scan0032 | |
| Condemning Goodyear tyres with diamond tread due to lack of control and ill effects on steering, recommending Dunlop or Michelin tyres instead. | 1st Oct 1926 | Box 157 \ 5 scan0033 | |
| Oversight by the Goodyear Company regarding the suitability of moulds for rims. | 1st Dec 1928 | Box 157 \ 5 scan0034 | |
| Letter from Paris to Derby regarding the sale or return of two non-standard Goodyear tyres. | 27th Jan 1931 | Box 157 \ 5 scan0035 | |
| Communication regarding the return of Goodyear tyres for 880 francs to avoid a loss on the deal. | 4th Feb 1931 | Box 157 \ 5 scan0036 | |
| From the Paris office to Derby regarding the sale of two Goodyear Tyres & Tubes for Chassis 24 EX. | 10th Feb 1931 | Box 157 \ 5 scan0037 | |
| From Accounts-Sèvres requesting an invoice regarding two returned Goodyear tyres for chassis 24-EX. | 18th Feb 1931 | Box 157 \ 5 scan0038 | |
| Requesting a preliminary report on Goodyear Tyres currently being tested. | 8th Apr 1932 | Box 157 \ 5 scan0039 | |
| The development and low-pressure running of Goodyear 'Airwheel' tyres on a Ford car. | 18th Apr 1932 | Box 157 \ 5 scan0040 | |
| Test report on the mileage and performance of Goodyear tyres compared to Dunlop tyres. | 19th May 1932 | Box 157 \ 5 scan0041 | |
| Offer from Goodyear for a free set of tyres. | 17th Oct 1932 | Box 157 \ 5 scan0042 | |
| Declining an offer of Goodyear tyres for testing. | 20th Oct 1932 | Box 157 \ 5 scan0043 | |
| Request to obtain a set of five Goodyear silent non-skid tread tyres for a Peregrine. | 13th Dec 1932 | Box 157 \ 5 scan0044 | |
| Testing and standardisation of India and Goodrich tyres for experimental cars. | 30th Dec 1932 | Box 157 \ 5 scan0045 | |
| Purchase of Goodyear tyres for a Bensport chassis, specifically regarding their claim of a silent non-skid tread. | 2nd Jan 1933 | Box 157 \ 5 scan0046 | |
| Internal request to order six Goodyear tyre covers for Buick and Essex cars. | 6th Mar 1935 | Box 157 \ 5 scan0047 | |
| Order for various experimental Goodyear and U.S. Royaal tyres. | 13th Apr 1935 | Box 157 \ 5 scan0048 | |
| The cause of tyre noise on Spectre cars, identifying uneven tread wear from reverse caster action. | 10th May 1935 | Box 157 \ 5 scan0049 | |
| F. Dodd to Roy requesting an order for four Goodyear tyres for a Buick. | 12th Jul 1935 | Box 157 \ 5 scan0050 | |
| The order of four Goodyear tire covers for a Graham Car. | 5th Sep 1935 | Box 157 \ 5 scan0051 | |
| Requesting an order for Goodyear tire covers for a Buick car. | 23th Sep 1935 | Box 157 \ 5 scan0052 | |
| Announcing a meeting to discuss equipment and testing requirements. | 22th Jan 1936 | Box 157 \ 5 scan0053 | |
| List of chassis equipment to be instructed, detailing various site and equipment works with associated references, remarks, and delivery dates. | 17th Jan 1936 | Box 157 \ 5 scan0054 | |
| List of instructions for chassis equipment, page 2a, detailing items and actions. | 22th Jan 1936 | Box 157 \ 5 scan0055 | |
| Phantom III tyre noise tests, comparing Dunlop and Goodyear tyres and the effect of rubber components. | 30th Sep 1936 | Box 157 \ 5 scan0056 | |
| Investigations and experiments to reduce tyre noise on the Phantom III model. | 6th Jan 1936 | Box 157 \ 6 scan0001 | |
| Experiments to reduce body noise over rough surfaces by using rubber mountings. | 6th Jan 1936 | Box 157 \ 6 scan0002 | |
| Letter from a tyre supplier explaining damage caused during the unwrapping of tyres at their depot. | 8th Jan 1936 | Box 157 \ 6 scan0003 | |
| Requesting an official order for tyres from the India Tyre & Rubber Co. Ltd. | 13th Jan 1936 | Box 157 \ 6 scan0004 | |
| Technical memo discussing the causes of front tyre wear and recommending a scheme for investigation and improvement. | 13th Jan 1936 | Box 157 \ 6 scan0005 | |
| Specification sheet for India Tyres 5.50 x 18, detailing the effective rolling circumference. | 10th Feb 1936 | Box 157 \ 6 scan0006 | |
| Excessive tyre noise on a Bentley Trials Coupe B-8-FB, requesting a change to more silent tyres. | 10th Feb 1936 | Box 157 \ 6 scan0007 | |
| Letter from a customer arranging for his Bentley to be sent to Derby for servicing and improvements. | 10th Feb 1936 | Box 157 \ 6 scan0008 | |
| Letter from India Tyre & Rubber Co. regarding additions and clutch work on a Bentley chassis. | 11th Feb 1936 | Box 157 \ 6 scan0009 | |
| Letter from India Tyre & Rubber Company Ltd. concerning a complaint of tyre noise on a 4.5-litre Bentley. | 11th Feb 1936 | Box 157 \ 6 scan0010 | |
| Bentley tyre noise, prioritizing adhesion over silence. | 13th Feb 1936 | Box 157 \ 6 scan0011 | |
| Letter to The Earl of Rothes regarding a meeting and an inspection of Major Dugdale's car. | 21th Feb 1936 | Box 157 \ 6 scan0012 | |
| Letter from a tyre company discussing tyre fitment for 4¼-litre Bentley and Phantom III models. | 22th Feb 1936 | Box 157 \ 6 scan0013 | |
| Letter to The Earl of Rothes regarding Bentley tyre sections and a steel body query. | 24th Feb 1936 | Box 157 \ 6 scan0014 | |
| Letter from India Tyre & Rubber Co. regarding tyre recommendations for the new 4 1/2 Litre Bentley. | 9th Mar 1936 | Box 157 \ 6 scan0015 | |
| Technical comparison of various tyre specifications and their impact on gear ratio and stability. | 9th Mar 1936 | Box 157 \ 6 scan0016 | |
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