ISO 5751-2:2010 pdf free download – Motorcycle tyres and rims (metric series)一 Part 2: Tyre dimensions and load-carrying capacities.
This part of ISO 5751 specifies the tyre size designation, dimensions and load-carrying capacities of metric series motorcycle tyres. It is applicable to such tyres with a height-to-width ratio of 100 % and below.
NOTE See ISO 4249 for motorcycle tyres and rims (code-designated series) of rim diameter codes 13 and above, and ISO 6054 for those of codes 12 and below.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 4223-1, Definitions of some terms used in the tyre industty — Part 1: Pneumatic tyres
ISO 5751-1, Motorcycle tyres and rims (metric series) — Part 1: Design guides
ISO 5751-3, Motorcycle tyres and rims (metric series) — Part 3: Range of approved rim contours
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4223-1 apply.
4 Tyre designation
4.1 General
The tyre designation shall be as specified in ISO 5751-1, completed by the addition of the service description,
i.e. load index and speed symbol.
4.2 Tyre construction code
The tables in this part of ISO 5751 show, as examples, tyre size designations for tyres in diagonal construction. However, a motorcycle lyre having, for example, a
nominal section width of 100 mm,
nominal aspect ratio of 90,
— nominal rim diameter code of 18 M/C,
Allow the tyre to stand for 24 h at normal room temperature, then readjust the inflation pressures to those specified in a), b) and c), before performing the measurements.
When measuring on rims having a rim width code that differs from that of the measuring rim width code given in the tables of this part of ISO 5751, the section-width and overall-width values of the tyre used for comparison with the data given in Tables 1 to 14 shall be adjusted as follows:
Rm is the width, expressed in millimetres, of the rim used for the measurements;
R is the width, expressed in millimetres, of the measuring rim width code given in the tables.
6 Tread configurations
ISO 5751-1:—, Figure 1, shows various tread configurations. The following attributions of tread-type configurations to the type of service are to be considered as examples only. The choice of a given tread-type configuration for a given tyre is at the discretion of the tyre manufacturer alone.
Tread type A is commonly adopted for highway-service low-speed tyres;
tread type B is commonly adopted for highway-service high-speed tyres;
— tread type C is commonly adopted for tyres used in both on- and off-road service;
— tread type D is commonly adopted for tyres exclusively in off-road service.
7 Load ratings
7.1 General
Tables 15 to 29 show the standardized maximum tyre load-carrying capacity for each given tyre size designation.
7.2 Load capacity at reduced speeds
Subject to acceptance by the tyre manufacturer and taking into account the conditions of use of the motorcycle, the load capacities corresponding to the load indices indicated in Tables 15 to 29 may be modified by the percentages given in Table 30. This modification is possible when the maximum speed of motorcycle is different from the one associated with the speed symbol.
7.3 Load capacity at speeds higher than 210 km/h
For the load-carrying capacities of tyres marked with speed symbols “V” or “W” operating at speeds higher than 210 km/h, see ISO 5751 -1.