Overview
ISO 10499-2:1998 - "Industrial tyres and rims - Rubber solid tyres (metric series) for pneumatic tyre rims - Part 2: Load ratings" defines how load capacities (load ratings) are specified and marked for rubber solid tyres in the metric series that are intended for pneumatic tyre rims, primarily used on material handling equipment operating on prepared surfaces. The standard is part of the ISO 10499 series and complements ISO 10499-1 (designation, dimensions and marking) and ISO 3739-3 (rim profiles).
Key topics and requirements
- Scope: Specifies load ratings for rubber solid tyres (metric series) for pneumatic rims used mainly on material handling equipment.
- Load index (LI): A numeric code that corresponds to the maximum load a tyre can carry at the tyre’s speed code and manufacturer-specified service conditions. ISO 10499-2 includes a comprehensive LI-to-load (kg) table covering the standard range (examples: LI 139 = 2430 kg).
- Speed code: Letter codes indicating reference speed categories. The standard gives codes A2–A5 (A2 = 10 km/h, A3 = 15 km/h, A4 = 20 km/h, A5 = 25 km/h). The reference speed used for load identification is 25 km/h (A5); lower maximum-speed tyres must be marked with the appropriate lower code and LI.
- Marking: Tyres must be marked with dimensional designation and the service conditions: load index and speed code. Example marking format in the standard:
225/70 - 10/6.5 139 A5 (explained in the text).
- Calculation and rounding: Reference load is the 100% value corresponding to the marked LI; calculated loads must be rounded up to the nearest 5 kg.
- Operational rules:
- Twin (dual) wheel mounting doubles the single-wheel load capacity.
- Load ratings should, where possible, match those of pneumatic tyres of the same dimensions to support interchangeability.
- Compatibility with rim profile and rim strength must be confirmed with tyre and rim manufacturers.
Practical applications and users
- Who uses it: tyre manufacturers, rim producers, OEMs of forklifts and other material-handling equipment, fleet managers, procurement and maintenance teams, testing labs, and regulatory/standards personnel.
- Why it matters: Ensures consistent, traceable load rating information for solid rubber tyres used on pneumatic rims, aiding safe selection, interchangeability, and compliance during tyre replacement or equipment design.
- Typical use cases: specifying replacement solid tyres for forklifts, verifying load capacity for retrofit solid tyres, procurement specifications, and maintenance/inspection procedures.
Related standards
Keywords: ISO 10499-2:1998, industrial tyres, rubber solid tyres, load ratings, pneumatic tyre rims, load index, speed code, material handling, forklift tyres, tyre marking.
Open preview (PDF)Industrial tyres and rims — Rubber solid tyres (metric series) for pneumatic tyre rims — Part 2: Load ratings