ISO 18805:2017

Overview

ISO 18805:2017 - Tyre classification - Agricultural, forestry and construction machines defines the classification codes and nomenclature for tyres used on agricultural and forestry tractors and related machines. Published by ISO in 2017, the standard establishes a common, optional code system (separate from size markings) to identify tyre purpose and tread type for agricultural, forestry, logging and construction applications.

Key Topics

• Scope and purpose
  • Specifies classification codes for agricultural and forestry tractors and machines.
  • Classification codes are optional and must be clearly separated from the tyre size marking.
• Terminology
  • Uses terms and definitions from ISO 4223‑1 (Normative reference) for consistent tyre industry language.
• Tyre role definitions (from Table 1)
  • Examples: tractor-drive wheel tyres (driven axles, sustained high torque), tractor-steering wheel tyres (non‑driven), implement tyres, traction tyres, trailer tyres, logging/forestry service tyres, and high flotation tyres.
• Classification codes and nomenclature (from Table 2)
  • Major groups and examples:
    • R - Agricultural tractor drive wheel tyres (R‑1, R‑1W, R‑2, R‑3, R‑4)
    • F - Agricultural tractor steering wheel tyres (F‑1, F‑2, F‑3)
    • I - Agricultural implement tyres (I‑1 to I‑6)
    • G - Garden tractor/implement tyres (G‑1 to G‑3)
    • LS - Logging and forestry service tyres (LS‑1 to LS‑4)
    • HF - High flotation tyres (HF‑1 to HF‑4)

Applications

Who uses ISO 18805:2017 and why:

• Tyre manufacturers and designers - to label products consistently for market clarity and equipment matching.
• OEMs and vehicle manufacturers - to specify appropriate tyre types for tractors, harvesters, forestry machines and construction equipment.
• Fleet managers and agricultural contractors - to select tyres for required traction, flotation or torque applications.
• Procurement, distributors and dealers - to compare and classify tyres across suppliers and regions.
• Regulators and standards bodies - to harmonize classification for trade, safety guidance and technical documentation.

Practical benefits include clearer product identification, easier equipment-tyre matching, improved aftermarket communication and reduced risk of incorrect tyre application.

Related Standards

• ISO 4223-1 - Definitions of some terms used in the tyre industry - Part 1: Pneumatic tyres (normative reference)
• Developed by ISO/TC 31 (Tyres, rims and valves), Subcommittee SC 5 (Agricultural tyres and rims)

Keywords: ISO 18805:2017, tyre classification, agricultural tyres, forestry tyres, tyre nomenclature, tractor tyres, high flotation tyres, logging tyres.