Series of motorcycle rims
1 Scope
This standard specifies the dimensions and tolerances of the contours of all types of motorcycle rims, and gives the rim contour and main dimensions of the fitting part between tyre and rim.
This standard is applicable to the rims of various series of motorcycle tyres specified in GB/T 2983.
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 documents (including any amendments) applies.
GB/T 2933 Wheels and rims for pneumatic tyres—Vocabulary, designation and marking (GB/T 2933-2009, ISO 3911: 2004, IDT)
GB/T 2983 Series of motorcycle tyres (GB/T 2983-2015, ISO 4249-1: 1985, ISO 4249-2: 1990, ISO 4249-3: 2010, ISO 5751-1: 2010, ISO 5751-2: 2010, ISO 5751-3: 2010, ISO 5995-1: 1982, ISO 6054-1: 1994, NEQ
GB/T 6326 Tyre terms and definitions (GGB/T 6326-2014, ISO 4223-1: 2002, NEQ)
GB/T 9769 Rim contour measure
QC/T 722 Test method for contour and mopeds rims—Template test
3 Terms and definitions
For the purpose of this document, the terms and definitions given in GB/T 2933 and GB/T 6326 apply.
4 Symbols
For the purposes of this document, the following symbols apply.
A: Specified rim width.
B: Flange width.
C: Flange radius position.
D: Specified rim diameter.
DH: Diameter of hump peak.
E: Hump position.
F: Valve position.
G: Flange height.
H: Depth of well bottom.
L: Width of well bottom.
M: Position of well bottom.
P: Bead seat width.
R1: Flange joint radius.
R2: Flange radius.
R3: Bead seat fillet radius.
R4: Well top fillet radius.
R5: Well bottom fillet radius.
R6: Radius of inner circle of hump.
R7: Radius of outer circle of hump.
R8: Well bottom groove radius.
V: Valve hole diameter.
α: Well bottom angle.
5 Classification and designation
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Classification and designation
6 Cylindrical bead seat rim (WM type)
7 5° tapered bead seat rim (MT type)
8 Tapered straight-side rim
9 Divided rim (DT type)
10 Drop-center rim (DC type)
11 Rim valve hole
12 Rim measurement
Annex A (Informative) Structural changes between this standard and ISO standards
Annex B (Informative) Technical differences between this standard and ISO standards and their causes
