Standard wheel & rim terminology
Reference SAE Standard J751
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Wheel & Rim Safety Manual
Single Piece Rims
1. Nominal Rim Width
2. Nominal Rim Diameter (Bead Seat Diameter)
3. Rim Inside Diameter
4. Valve Hole
5. Flange Height
6. Flange Width
7. Bead Seat Area
Multi-Piece Rims (Three Piece Style)
Single Piece Rims
Reference SAE Standard J751
1. Nominal Rim Width
2. Nominal Rim Diameter (Bead Seat Diameter)
3. Rim Inside Diameter (ID)
4. Valve Hole
5. Flange Height
6. Flange Width
7. Side Flange (Detachable Flange)
8. Lock Ring
9. O-Ring (Rubber)
10. 28 Degree Mounting Angle
11. Lock Ring Groove
12. O-Ring Groove
13. Rim Driver (Demountable Rim)