ISO 4249-3-2010 pdf free download

ISO 4249-3-2010 pdf free download.Motorcycle tyres and rims (code-designated series) — Part 3:
Rims
Pneumatiques et jantes pour motocycles (series dont les dimensions sont designées par des codes) — Partie 3: Jantes.
This part of ISO 4249 specifies the nm dimensions for a selection of rims for motorcycle tyres. It stipulates only those rim contour dimensions necessary for tyre mounting, and for fitting the tyre to the rim.
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 4249-1:1985, Motorcycle tyres and nms (Code-des?gnated series) — Part 1: Tyres
3 Finish
3.1 Rim contour
The rim on the side of the Lyre shall be smoothly contoured and free of sharp edges.
3.2 Rim valve hole
3.2.1 The rim valve hole shall be centred on the bottom of the rim well. On the Lyre side, the edges shall be rounded or chamfered. On the hub side, the edges shall be free of burrs, which could damage the valve. Dimensions and tolerances of valve holes shall be as shown in Figure 1.
3.2.2 The rim hole shall have a diameter of 8.3g mm See Figure 1 a).
For the fitrrient of tubeless valves, a circumferential flat area of at least 14,5 mm is required on the tyre side of the rim. The maximum thickness of the rim at the rim hole shall be 9.4 mm. See Figure 1 b).
At the request of the motorcycle manufacturer, rim holes of 11,3 mmdiameter may be provided; in this case, the flat area around the hole shall be at least 19 mm diameter.
For the possibility of off-centre positioning, see Figure 1 C).
3.2.3 The rim shall be counter-bored at the valve hole to reduce the thickness to 4 mm maximum for seating snap-in valves.ISO 4249-3-2010 pdf free download.