GB/T 31580-2015Series of electric bicycle rims (English PDF)

1 Scope

This standard specifies the electric bicycle rim contour dimensions and tolerances, and gives the tire and the rim with the rim contour portion of the curve

Its main dimensions.

This standard applies to GB/T 31548 contains rims of various series of electric bicycle tire.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein

Member. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 2933 pneumatic tire and wheel rim terminology, specifications and code flags

GB/T 6326 tires terms and definitions

GB/T 31546 electric bicycle tires

GB/T 31548 series electric bicycle tires

3 Terms and Definitions

Terms and definitions GB/T 2933 and GB/T 6326 defined apply to this document.

4 Symbol

The following symbols apply to this document.

a. Calibration rim width;

beta. bead seat angle;

D. Calibration rim diameter;

D1. measuring rim diameter;

D2. outer diameter of the rim;

d. diameter of the valve hole;

g. rim height;

H. rim groove depth;

H1. bottom depth (above the bottom rim accessibility means a minimum depth of the tire);

l1. bottom width (with feet above the rim width);

p. bead seat width;

r1. the radius of the rim engagement;

r2. radius of the rim;

r3. bead seat radius;

r4. slot tip radius;

r5. bottom rim radius.