ISO 4249-2:1990 PDF

Name: ISO 4249-2:1990 — Motorcycle tyres and rims (Code-designated series) — Part 2: Tyre load ratings
SKU: ISO 4249-2:1990
Price: 25 EUR
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Motorcycle tyres and rims (Code-designated series) — Part 2: Tyre load ratings

Название (английский):

ISO 4249-2:1990

Motorcycle tyres and rims (Code-designated series) — Part 2: Tyre load ratings

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 4
Дата публикации:: 8 февраля 1990 г.
Издание:: ISO IS 4249 edition 2 version 1
ICS:: 83.160.10

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Описание (английский):

Tabulates the correlation between load index and tyre load-carrying capacity (table 1), between speed symbol and speed category (table 2), the maximum tyre load capacities (table 3), and the variation of maximum load capacities of tyres according to maximum speed of motorcycle (table 4). This second edition cancels and replaces the first edition (1983).

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 4249-2:1990, "Motorcycle tyres and rims (Code-designated series) - Part 2: Tyre load ratings," defines load- and speed-related ratings for inch code-designated motorcycle tyres. Issued by ISO/TC 31 (Tyres, rims and valves), this second edition (1990) replaces the 1983 edition and tabulates the correlation between load index and tyre load-carrying capacity, the relationship of speed symbols to speed categories, and maximum tyre load capacities including how they vary with motorcycle maximum speed.

Key topics and requirements

Load Index to Capacity: Tabled correlation between a tyre’s load index (LI) and its tyre load-carrying capacity (TLCC). Useful when selecting tyres for a required load rating.

Speed Symbols: Defined mapping of speed symbols to numeric speed categories (km/h). Helps ensure tyres are matched to the motorcycle’s maximum permitted speed.

Maximum Load Capacities: Tables for maximum tyre load capacities for standard and “extra load” tyre versions (speed symbols L and P are referenced). Includes guidance on typical inflation pressures as a reference only.

Variation with Vehicle Speed: Table that shows percentage variation of maximum load capacities according to motorcycle maximum speed - enabling permitted load adjustments when motorcycle speed differs from the load-index-associated speed.

Service Characteristics Indication: Requirements to indicate load index and speed symbol on tyres so service and safety information is available.

Scope limitation: Applies to inch code-designated tyre series (designation by nominal section width and nominal rim diameter in inches). It is not a metric sizing standard, but a code-designated series description.

Practical applications and users

Who uses ISO 4249-2:1990:

Tyre manufacturers - to assign and mark load indices and speed symbols consistent with international practice.

Motorcycle manufacturers - to specify appropriate tyre load and speed ratings for vehicle homologation and safety compliance.

Service centers and tyre fitters - to verify tyre suitability for a motorcycle’s load and speed requirements.

Regulators and vehicle inspectors - to check conformity of tyre markings and permitted load/speed combinations.

Fleet operators and owners - to make informed tyre choices based on load-carrying needs and vehicle performance.

Practical benefits:

Ensures tyres are matched to load and speed demands, improving safety and performance.

Provides a standardized reference for tyre selection, designation and interchangeability within inch code-designated series.

ISO 4249-2:1990 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Practical applications and users

Related standards

Технические детали

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