| Description | Date | Identifier | |
| Unsuitability of wire wheels for the American market and customer preference for wood wheels. | 16th Sep 1919 | Box 42 \ 5 Scan002 | |
| Issues with soft edge beaded tyres and wire wheels, recommending alternatives like wood wheels for the US market. | 24th May 1923 | Box 42 \ 5 Scan003 | |
| Summary page of recommendations regarding the supply and assembly of wheels and hubs. | 30th Jan 1920 | Box 42 \ 5 Scan004 | |
| List of rims and tyres sent from the United States for experimental work. | 30th Jan 1920 | Box 42 \ 5 Scan005 | |
| Extract of a memo detailing new features and testing plans for the 4.EX experimental chassis. | 27th Feb 1920 | Box 42 \ 5 Scan006 | |
| Sourcing of Dunlop wheels with demountable rims and compatible straight-sided tyres. | 18th Mar 1920 | Box 42 \ 5 Scan007 | |
| Whether chassis sent to America are supplied with or without tyres. | 19th Apr 1920 | Box 42 \ 5 Scan008 | |
| Letter from R. to C.J. discussing the use of security bolts and a preference for American straight-sided tyres. | 15th Apr 1920 | Box 42 \ 5 Scan009 | |
| Visit from a Dunlop Director regarding the production and supply of straight-sided tyres and wire wheels. | 26th Apr 1920 | Box 42 \ 5 Scan010 | |
| Request to check a statement about American tyres, referencing an attached document. | 20th May 1920 | Box 42 \ 5 Scan011 | |
| Comparison between Dunlop and standard American tyre sizes. | 4th May 1920 | Box 42 \ 5 Scan012 | |
| Proposal from the Spreckels 'Savage' Tire Co. and its implications for owners needing replacement tires. | 22th Jul 1920 | Box 42 \ 5 Scan013 | |
| Business proposal from Linus G. Read regarding the supply of Spreckels 'Savage' Tires from California. | 12th Jul 1920 | Box 42 \ 5 Scan014 | |
| Complaints from America about hard tyres causing poor ride quality, difficult steering, and increased wear and tear. | 1st Sep 1920 | Box 42 \ 5 Scan015 | |
| Experimental tyre testing, comparing mileage and comfort at different pressures for Dunlop and Goodyear tyres. | 1st Sep 1920 | Box 42 \ 5 Scan016 | |
| Technical discussion on tyre performance, including pressure, fitting, tread patterns, and noise issues. | 1st Sep 1920 | Box 42 \ 5 Scan017 | |
| Continued page of a report commenting on the noise levels of Wood Milne tyres. | 1st Sep 1920 | Box 42 \ 5 Scan018 | |
| Chassis troubles and the riding qualities of post-war cars, attributing issues to cord tires and thick leaf rear springs. | 22th Sep 1920 | Box 42 \ 5 Scan019 | |
| Letter to Mr. Claude Johnson regarding spring dampers, transmission noises, and replacing post-war leaf springs with pre-war ones. | 22th Sep 1920 | Box 42 \ 5 Scan020 | |
| Cover letter attaching a copy of a letter from America regarding tires. | 7th Oct 1920 | Box 42 \ 5 Scan021 | |
| Letter from Rolls-Royce of America regarding the inconveniently tight fit of Kelly Springfield and Firestone tires on the rim. | 22th Sep 1920 | Box 42 \ 5 Scan022 | |
| Internal memorandum forwarding copies of letters from America and the Firestone Tire & Rubber Company regarding tires. | 22th Oct 1920 | Box 42 \ 5 Scan023 | |
| Letter from Rolls-Royce of America regarding the tight fit of Firestone tires. | 6th Oct 1920 | Box 42 \ 5 Scan024 | |
| Letter from Firestone Tire & Rubber Co. regarding a complaint about difficulty detaching an SS tire from a rim. | 29th Sep 1920 | Box 42 \ 5 Scan025 | |
| Letter discussing the positive performance and lack of bead difficulty with SS tires. | 25th Oct 1920 | Box 42 \ 5 Scan026 | |
| Tight fit of Firestone tyres on standard rims, suggesting they may be smaller than standard. | 25th Oct 1920 | Box 42 \ 5 Scan027 | |
| Comparing the price of Goodyear/Goodrich tyres in the U.S.A. and requesting the UK price for Dunlop tyres. | 8th Feb 1921 | Box 42 \ 5 Scan028 | |
| The cost for a set of four tyres from Dunlop, Goodyear, and Goodrich. | 22th Feb 1921 | Box 42 \ 5 Scan029 | |
| Letter to Dunlop Rubber Co. discussing experiences with straight-sided cord tyres versus woven fabric tyres. | 20th Jun 1921 | Box 42 \ 5 Scan030 | |
| Continued letter discussing optimal tyre pressures and their effect on mileage and wear, with recommendations based on vehicle weight. | 20th Jun 1921 | Box 42 \ 5 Scan031 | |
| Cover letter attaching correspondence regarding Straight-Sided Tyres. | 21th Nov 1922 | Box 42 \ 5 Scan032 | |
| Letter from Rolls-Royce of America regarding issues and observations on straight-sided tires and their flanges. | 9th Nov 1922 | Box 42 \ 5 Scan033 | |
| Proposed alterations to tyres, following a trend from the USA for larger, softer tyres with lower air pressure. | 15th Aug 1923 | Box 42 \ 5 Scan034 | |
| Short note expressing a preference for a 6-inch measurement over a 7-inch one. | 1st Aug 1923 | Box 42 \ 5 Scan035 | |
| Test impression of a well-worn Goodrich material sample, likely a tire tread. | 1st Aug 1923 | Box 42 \ 5 Scan036 | |
| Letter to M. Olley in America regarding balloon tyres and a visit from a Dunlop representative to the Fisk Tyre Co. | 1st Oct 1923 | Box 42 \ 5 Scan037 | |
| Letter discussing the performance, noise, and testing of various tire sizes and brands. | 19th Oct 1923 | Box 42 \ 5 Scan038 | |
| Technical discussion comparing Dunlop (English) and American large tires, focusing on performance issues, construction, and sizing. | 19th Oct 1923 | Box 42 \ 5 Scan039 | |
| Tire sizes, comparing them to Dunlop's, and mentioning hopes for success with the Tire and Rim Association. | 8th Oct 1923 | Box 42 \ 5 Scan040 | |
| Test report on 32 x 6 Goodyear tires after 12,000 miles of use. | 8th Oct 1923 | Box 42 \ 5 Scan041 | |
| Comparison of different tyre tread patterns and their associated noise and wear characteristics. | 10th Oct 1925 | Box 42 \ 5 Scan042 | |
| Service bulletin discussing the causes of tire wear, specifically scalloping on non-skid treads. | 10th Oct 1925 | Box 42 \ 5 Scan043 | |
| The causes and remedies for excessive wear on right front tires, focusing on steering adjustments. | 25th May 1927 | Box 42 \ 5 Scan044 | |
| Letter detailing the results of tire trials, focusing on tread widths and their effect on steering performance. | 25th May 1927 | Box 42 \ 5 Scan045 | |
| Steering problems with balloon tyres on chassis for the American market. | 29th Jun 1927 | Box 42 \ 5 Scan046 | |
| Letter discussing a steering issue on chassis 18 LF and the cabled correspondence regarding a solution. | 29th Jun 1927 | Box 42 \ 5 Scan047 | |
| Letter to Mr. H.J. Fuller of Aldred & Co. regarding a difficult problem with steering effects. | 29th Jun 1927 | Box 42 \ 5 Scan048 | |
| Steering improvements on the 18-LF model, considering differences between UK and USA driving conditions. | 30th Jun 1927 | Box 42 \ 5 Scan049 | |
| Letter discussing American tire standardisation and changes to specific wheel and tire sizes. | 8th Mar 1929 | Box 42 \ 5 Scan050 | |
| Wheel and tire specifications, clearances, and issues with drop center rims. | 17th Jan 1929 | Box 42 \ 5 Scan051 | |
| Standard chart for tire and rim specifications and markings. | 17th Jan 1929 | Box 42 \ 5 Scan052 | |
| Letter discussing potential improvements and tests regarding petrol gauges, an apparatus for Phantom II rear brakes, valve springs, and tyres. | 13th Feb 1930 | Box 42 \ 5 Scan053 | |
| Methods to dampen axle and radiator movement, including frame stiffening and the use of Sorbo rubber. | 13th Feb 1930 | Box 42 \ 5 Scan054 | |
| Dimensions and weight of a 7' x 19' U.S. Royal Tyre compared to standard Dunlop tyres. | 8th May 1930 | Box 42 \ 5 Scan055 | |
| Comparison table of specifications for four different tyre models. | 20th Feb 1925 | Box 42 \ 5 Scan056 | |
| Correction notice for the wheel revolutions per mile of a specific Dunlop tyre. | 15th May 1930 | Box 42 \ 5 Scan057 | |
| Postponing the testing of two types of 19 x 6 rims and tyres for the 25 HP model. | 27th May 1930 | Box 42 \ 5 Scan058 | |
| Temperature tests at Brooklands detailing insufficient radiator cooling, petrol starvation, and a seized cut-out valve. | 11th Jun 1930 | Box 42 \ 5 Scan059 | |
| Acceleration test results comparing a standard carburetter with an air silencer carburetter. | 4th Jun 1930 | Box 42 \ 5 Scan060 | |
| Steering tests conducted at Brooklands on different tyre and wheel combinations. | 4th Jun 1930 | Box 42 \ 5 Scan061 | |
| Steering and ride quality tests using Dunlop Silent Tyres at various pressures. | 10th Jul 1930 | Box 42 \ 5 Scan062 | |
| Use and testing of 19-inch and 20-inch American wheels and tyres. | 10th Jul 1930 | Box 42 \ 5 Scan063 | |
| Internal memorandum discussing the selection of wheels and tires for the U.S. market, specifically American versus English rims. | 16th Jul 1930 | Box 42 \ 5 Scan064 | |
| Proposal to use 19 x 7 tires and Dunlop-and-American rims for a specific vehicle order and future imports. | 24th Jul 1930 | Box 42 \ 5 Scan065 | |
| Specification sheet for U.S. Royal Flat Base 7.00' x 20.0' tyres and wheels. | 24th Jul 1930 | Box 42 \ 5 Scan066 | |
| Cable about the supply and testing of Dunlop tyres on a new rim. | 23th Aug 1930 | Box 42 \ 5 Scan067 | |
| Requesting an update on the current position of tests for wheels, tyres, and bumpers for frames. | 2nd Sep 1930 | Box 42 \ 5 Scan068 | |
| Wheels, tyres, and frame testing for an American contract. | 25th Jul 1930 | Box 42 \ 5 Scan069 | |
| Wheel and tyre specifications for the Left-Hand Phantom II model for the American market. | 3rd Sep 1930 | Box 42 \ 5 Scan070 | |
| Correspondence about the difficulty of fitting tires and tubes due to valve hole positioning on Dunlop rims. | 27th May 1931 | Box 42 \ 5 Scan071 | |
| Technical letter discussing issues with well base rims and valve placement on American cars. | 27th May 1931 | Box 42 \ 5 Scan072 | |
| Procurement and local sourcing of various automotive components for American production. | 1st Jun 1920 | Box 42 \ 5 Scan073 | |
| Relaying a cable from Rolls-Royce of American, Inc. regarding a shipment of lubricators. | 15th Jul 1920 | Box 42 \ 5 Scan074 | |
| Letter from E. & A. F. Bourdas regarding a 'Kings' patent spring oiler. | 3rd Nov 1920 | Box 42 \ 5 Scan075 | |
| Advertisement leaflet for King's Patent Automatic Spring Leaf Oilers. | 3rd Nov 1920 | Box 42 \ 5 Scan076 | |
| Informational leaflet for King's Spring Leaf Lubricators, explaining their function, installation, and benefits. | 8th Nov 1920 | Box 42 \ 5 Scan077 | |
| 'King's Patent Spring Oiler', a sample of which is being sent for evaluation. | 8th Nov 1920 | Box 42 \ 5 Scan078 | |
| Short memo dismissing the 'King's Patent Spring Oiler' as not of interest. | 16th Nov 1920 | Box 42 \ 5 Scan079 | |
| Cover letter forwarding correspondence from Rotherham & Sons, Coventry regarding a sample. | 12th Feb 1921 | Box 42 \ 5 Scan080 | |
| Letter from Rotherham & Sons regarding a patent application for a lubrication device intended to compete with the 'Alemite' system. | 9th Feb 1921 | Box 42 \ 5 Scan081 | |
| Two Grease Injectors from Messrs. E.H. Hill Ltd. with different flexible connections. | 24th Feb 1921 | Box 42 \ 5 Scan082 | |
| Letter from Ernest H. Hill Limited quoting prices for grease injectors. | 1st Feb 1921 | Box 42 \ 5 Scan083 | |
| Rejecting sample grease injectors from Messrs. R.H. Hill Ltd. of Sheffield. | 24th Feb 1921 | Box 42 \ 5 Scan084 | |
| Sample of the T.A.B. pressure lubrication system. | 25th Feb 1921 | Box 42 \ 5 Scan085 | |
| The identification of a grease gun manufacturer in the USA or the UK. | 3rd Mar 1921 | Box 42 \ 5 Scan086 | |
| Letter from Ernest H. Hill Ltd. regarding an enquiry about an 'Alemite' grease gun and lubricators. | 1st Mar 1921 | Box 42 \ 5 Scan087 | |
| Cover note for an attached letter from T.B. Andre & Co. Ltd. and a grease gun. | 7th Mar 1921 | Box 42 \ 5 Scan088 | |
| Quote from T.B. Andre & Co. for their T.A.B. Pressure Lubrication System, including grease guns and nipples. | 2nd Mar 1921 | Box 42 \ 5 Scan089 | |
| Covering letter regarding the T.A.B. Lubrication System, attaching correspondence from T.B. Andre & Co. Ltd. | 22th Mar 1921 | Box 42 \ 5 Scan090 | |
| Letter from T.B. Andre & Co. regarding a new T.A.P. grease gun cartridge lubrication system. | 21th Mar 1921 | Box 42 \ 5 Scan091 | |
| Recommendation to standardise a new form of lubricator for the 40/50 car engines, advising to halt progress on the current standard. | 10th Dec 1920 | Box 42 \ 5 Scan092 | |
| Potential discontinuation of R.R. type lubricators in favour of a grease or oil gun system for the 40/50 chassis. | 1st Apr 1921 | Box 42 \ 5 Scan093 | |
| Comparing the T.A.B. lubrication system to the Alemite system, detailing issues with pressure, grease gun design, and leakage. | 5th Apr 1921 | Box 42 \ 5 Scan094 | |
| The specifications of various grease gun types. | 5th Apr 1921 | Box 42 \ 5 Scan095 | |
| Pressure test results of various grease guns. | 5th Apr 1921 | Box 42 \ 5 Scan096 | |
| Issues with a supplied grease gun from E.H. Hill and recommending the Alemite system as a better alternative. | 5th Apr 1921 | Box 42 \ 5 Scan097 | |
| Follow-up with Messrs. Rotherham regarding an experimental grease gun. | 7th Apr 1921 | Box 42 \ 5 Scan098 | |
| Brochure for the Empress High Pressure Lubricating System from Bowen Products Corporation. | 7th Apr 1921 | Box 42 \ 5 Scan099 | |
| Leaflet advertising the Empress High Pressure Lubricating System for motor cars and trucks. | 7th Apr 1921 | Box 42 \ 5 Scan100 | |
| Promotional leaflet for the Empress High Pressure Lubricating System, detailing its operation and benefits. | 7th Apr 1921 | Box 42 \ 5 Scan101 | |
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