BS ISO 5775-1:2014 pdf free

BS ISO 5775-1:2014 pdf free.Bicycle tyres and rims一Tyre designations and dimensions
To help customers in those countries where other systems of marking were used, the old marking(s) may be added in parentheses before or after the tyre size designation.
It is suggested that characters smaller than those used for the designation specified in 4.1.1 be adopted.See Annex A for correspondence between “tyre size designation” and “old markings”. Sizes not included in Annex A shall bear the tyre size designation only.
Before measuring, tyres shall be mounted on the measuring rim, inflated to the recommended inflation pressure, and allowed to stand for a minimum of 24 h at normal room temperature, after which the inflation pressure shall be readjusted to the original value.
The recommended straight side and crotchet type rim contours correlated to nominal tyre section widths, SN, are presented in Table 4.
When inflation pressures over 500 kPa are used, appropriate rim tapes shall be fitted.When mounting the tyre on a permitted rim, the section width of the tyre varies by 0,4 times the difference between the recommended and permitted rim widths.
NOTE 1 For tyres for foldable bicycles, consult the tyre manufacturer for the types of rims permitted.
NOTE 2 Rim dimensions and bead seat characteristics are given in ISO 5775-2.
Before measuring, tyres shall be mounted on the measuring rim, inflated to the recommended inflation pressure, and allowed to stand for a minimum of 24 h at normal room temperature, after which the inflation pressure shall be readjusted to the original value.
Tyres of special construction can be designed in such a way as to permit their mounting both on hooked bead and straight side rims of similar diameters. In this case, the tyre shall be marked with the tyre designations of both categories, the designations being separated by a solidus, for example: 20×1,375 / 47 – 406
The maximum tyre dimensions in service of the tyre shall conform to those of each tyre designation when fitted on the proper rim.BS ISO 5775-1 pdf free download.