This International Standard specifies the marking, dimensions, load ratings and reference speeds for existing series of agricultural tractor drive-wheel tyres with service description (load index and speed symbol).
It applies to tyres of radial construction in the speed categories 30 km/h (speed symbol A6), 40 km/h (speed symbol A8), and 50 km/h (speed symbol B).
ISO 8664:2005 Referenced Document
ISO 4223-1 Definitions of some terms used in the tyre industry - Part 1: Pneumatic tyres*, 2017-11-30 Update
ISO 4251-1 Code designated diagonal tyres (ply rating marked series) for agricultural tractors, trailers and machines — Part 1: Tyre designation and dimensions, and approved rim contours*, 2019-07-31 Update
ISO 4251-3 Tyres (ply rating marked series) and rims for agricultural tractors and machines - Part 3: Rims*, 2006-08-01 Update
ISO 8664:2005 history
2018ISO 8664:2018 Tyres for agricultural tractors and machines - Code-designated and service-description marked radial drive-wheel tyres
2010ISO 8664:2005/Amd 1:2010 Tyres for agricultural tractors and machines - Code-designated and service-description marked radial drive-wheel tyres; Amendment 1
2005ISO 8664:2005 Tyres for agricultural tractors and machines - Code-designated and service-description marked radial drive-wheel tyres
1992ISO 8664:1992 Agricultural tractor drive-wheel tyres; service description (load index - speed symbol) marked tyres