Ken,
I have a copy of ISO 4249-3:2010 which is the appropriate ISO specification (sorry for citing 6054-2, which is for smaller wheels only). I will send you a copy.
My original posting above has been updated, please do the same.
Yes, ISO 4249-3 Chapter 5: Cylindrical bead seat rims does cover the old Dunlop/Jones sections "WM0" through "WM3". There is however no reference to "WM" in the ISO standard.
Table 1 lists nominal rim widths (inside widths) from 1.1in to 3.0in, including WMO (1.5in = 38mm), WM1 (1.6in = 40.5mm), WM2 (1.85in = 47mm) and WM3 (2.15in = 55 mm). The list of standardized widths has been extende both upwards and downwards. Thus, the terms WM4, WM5 asf. are constructs with no bearing, meaning WM4 from source A isn't necessarily equal to WM4 from source B. The only generally valid reference is the aforementioned ISO standard.
Manufacturer's correct designation of a cylindrical bead seat rim is for instance: 18 x 1.85 ISO 4249-3. The corresponding service list of rim and tyre is given in table 3, ISO 4249-1:1985.
As to your question whether ISO 4249 has been adopted by ANSI, which is the american body acting on behalf the US government, I could not find a trace. Maybe not. ANSI is very slow at adopting ISO standards although it is one of the most active parties in the ISO commitees. It seems Canada is much more eager to adopt ISO standards. The major motorcycle producing nations like Britain, Germany, Italy and Japan have all adopted the ISO standard, naturally.
The first edition of ISO 4249 appeared 1978, well after Commando production had ceased.
-Knut
I have a copy of ISO 4249-3:2010 which is the appropriate ISO specification (sorry for citing 6054-2, which is for smaller wheels only). I will send you a copy.
My original posting above has been updated, please do the same.
Yes, ISO 4249-3 Chapter 5: Cylindrical bead seat rims does cover the old Dunlop/Jones sections "WM0" through "WM3". There is however no reference to "WM" in the ISO standard.
Table 1 lists nominal rim widths (inside widths) from 1.1in to 3.0in, including WMO (1.5in = 38mm), WM1 (1.6in = 40.5mm), WM2 (1.85in = 47mm) and WM3 (2.15in = 55 mm). The list of standardized widths has been extende both upwards and downwards. Thus, the terms WM4, WM5 asf. are constructs with no bearing, meaning WM4 from source A isn't necessarily equal to WM4 from source B. The only generally valid reference is the aforementioned ISO standard.
Manufacturer's correct designation of a cylindrical bead seat rim is for instance: 18 x 1.85 ISO 4249-3. The corresponding service list of rim and tyre is given in table 3, ISO 4249-1:1985.
As to your question whether ISO 4249 has been adopted by ANSI, which is the american body acting on behalf the US government, I could not find a trace. Maybe not. ANSI is very slow at adopting ISO standards although it is one of the most active parties in the ISO commitees. It seems Canada is much more eager to adopt ISO standards. The major motorcycle producing nations like Britain, Germany, Italy and Japan have all adopted the ISO standard, naturally.
The first edition of ISO 4249 appeared 1978, well after Commando production had ceased.
-Knut
