Vulcanised rubber and pneumatic tyres

In plain language

Charles Goodyear's 1844 US patent, number 3,633, describes mixing india-rubber with sulphur and white lead and then heating the mixture. Wikipedia says Goodyear found that heating rubber with sulphur made it rigid, and that he named the process vulcanisation after the heat involved. This process is the basis of the rubber used in tyres.

A pneumatic tyre is a rubber tube filled with air, fitted around a wheel. Robert William Thomson patented an air-filled rubber belt covered in leather. Wikipedia dates his London patent to 1845, and his US patent to 1847, but says the design never went into production. In 1888 John Boyd Dunlop made a practical air-filled tyre, which Wikipedia places in May Street, Belfast. Grace's Guide describes Thomson's wheels as giving a more comfortable, quieter ride. None of the sources gives measured figures for grip or durability.

Technical explanation

Raw rubber is a polymer made of long, loosely tangled molecules. Vulcanisation heats the rubber with sulphur, which forms cross-links between those molecules. The 1844 Goodyear patent gives a best recipe of 25 parts india-rubber, 5 parts sulphur and 7 parts white lead. The goods are heated to a high temperature, described as roughly 212 to 350 degrees Fahrenheit, with about 270 degrees given as the best effect. The patent text as read for this profile was scanned with OCR, so exact wording and figures should be checked against the original scan before reuse.

Thomson's 1847 US patent No. 5,104, 'Improvement in Carriage-Wheels', describes a hollow belt of air- and watertight material, such as sulphurised India-rubber or gutta-percha, or canvas saturated with sulphurised rubber. The belt is inflated through a screw-capped pipe and enclosed in an outer casing of leather segments fixed to the wheel. Dunlop's surviving prototype, held by National Museums Scotland, was made from Arbroath sailcloth and India rubber. Dunlop's patent was later held invalid because of Thomson's earlier patent. The sources disagree on the date of that ruling, giving 1890 and 1892.

Thomas B. Jeffery is credited with an 1882 patent on a clincher tyre, a design whose bead is held under a hooked rim edge. Charles K. Welch patented a detachable tyre design in 1890, which Dunlop bought. The sources reviewed do not describe how these designs were tested for wear, grip or ride comfort under controlled conditions, so the historical claims here are qualitative.

What the evidence says

Each statement is typed by the strength of its evidence and linked to the source that supports it.

Limitations and open problems

• Thomson's pneumatic tyre patent is dated 1845 by Grace's Guide and London 1845 by Wikipedia. Wikipedia also says the first patent appeared in 1847. The UK patent number and filing date were not checked against a primary record.
• The ruling that invalidated Dunlop's 1888 patent is dated 1890 by the National Museums Scotland page and 1892 by Wikipedia. The Online Bicycle Museum gives no date for the ruling.
• Grace's Guide places Thomson's 1847 demonstration in Regent's Park. No other source reviewed names the park.
• The Goodyear patent text was read through OCR, which has errors such as '27 0' for 270. Figures and wording should be checked against the scanned original.
• Thomas Hancock claimed to have invented vulcanisation independently. Wikipedia gives only years for his British patent, 1843 to 1844.
• Wikipedia dates Goodyear's discovery of vulcanisation to 1839 and cites US patent 1090 of 24 February 1839. This profile covers the 1844 patent only and does not check the 1839 patent.
• Wikipedia places the first practical tyre on May Street, Belfast. The National Museums Scotland page does not mention Belfast.
• The sources reviewed do not quantify grip, durability or comfort. Statements about these effects are qualitative summaries from encyclopaedia and museum pages, not test results.
• No peer-reviewed history paper on pneumatic tyres was found in the searches. Most of the history rests on patents, a museum page and encyclopaedia summaries, and the claims should be read with that in mind.

Possible future uses

Timeline

1. 15 Jun 1844Charles Goodyear is granted US patent 3,633 for treating rubber with sulphur and heat, the process later called vulcanisation. Sources: [1], [7]
2. 1845Robert William Thomson's pneumatic tyre patent, dated 1845 by Grace's Guide and by Wikipedia for London. Sources: [4], [6]
3. Mar 1847Thomson's 'Aerial Wheels' are demonstrated in London and fitted to horse-drawn carriages. Sources: [4]
4. 8 May 1847Thomson is granted US patent 5,104, 'Improvement in Carriage-Wheels', describing an air-filled rubber belt inside a leather casing. Sources: [2]
5. 1888John Boyd Dunlop makes a practical air-filled tyre. His patent specification is dated 1888. Sources: [3], [6], [5]
6. 1890Charles K. Welch patents a detachable tyre design, which Dunlop buys. Sources: [5]

Glossary

Vulcanisation

Heating rubber with sulphur so that it becomes stable and does not soften or stick in heat.

Gutta-percha

A natural rubber-like material from tropical trees, used alongside India rubber in early 19th-century products.

Clincher tyre

A tyre whose bead is held under a hooked rim edge so it stays on the wheel.

Pneumatic tyre

A tyre filled with compressed air that cushions the wheel against the road.

Sources

1. patent
   Improvement in India-Rubber Fabrics (US Patent 3,633)
   Charles Goodyear. United States Patent Office, 15 Jun 1844. Accessed 22 Oct 2026.
2. patent
   Improvement in Carriage-Wheels (US Patent 5,104)
   Robert William Thomson. United States Patent Office, 8 May 1847. Accessed 22 Oct 2026.
3. other
   The Dunlop tyre: Air apparent
   National Museums Scotland, 2026. Accessed 22 Oct 2026.
4. other
   Robert William Thomson
   Grace's Guide To British Industrial History, 2026. Accessed 22 Oct 2026.
5. other
   Pneumatic Tyre Patents
   Online Bicycle Museum, 2026. Accessed 22 Oct 2026.
6. other
   Tire
   Wikipedia, 2026. Accessed 22 Oct 2026.
7. other
   Charles Goodyear
   Wikipedia, 2026. Accessed 22 Oct 2026.

Revision history

3 changes since this profile was created.