ISO 18804:2021
[Current]
Rims for agricultural, forestry and construction machines
...Valve seat angles of 15 to 50 are permissible...
...ssion to clear valve head
Figure 8 Optional location of 15,7 mm valve hole
Dimensions in millimetres
a
For any angle selected for a given rim, the tolerance is 5...
...00 355,5 12,0 25,5 31,0 90,0 65,0 31,5 6,5 15
a
Larger values may be required to ensure sufficient space for tubeless tyre valve seating...