If you think the MK3 manual printed in the 70's is irrelevant then feel free to ask Avon tyres about it, it might surprise you and others about their reply regarding the tyres listed in it.
I will check what chain is on the original drawing that is recommended, if I remember rightly it refers to an old Renold number for the Norton Commando, reason being is that the connecting link for that chain in the 70's cleared the inner chaincase, but as the standards changed and updated so did side plate thickness and thus the link width, just enough to reduce the clearance.
Realistically the ISO 10190 spec badly needs updating, a lighter decent 10B chain would most probably exceed the tests required in 10190, but if it did it still cannot be called ISO 10190 approved chain as it differs dimensionally to the spec, in which case it would need to be labelled 'exceeds the testing required by ISO 10190'
Clearly modern chain made to 10190 spec these days would smash the minimum test specs of 10190 out of the park and far exceed those required of 10B, which is why the spec is pretty pointless. The side plate thickness required of 10190 is far thicker and this makes for a heavier chain. This new chain, fantastic on Velocette, Vincent, Triumph etc where the link has plenty of clearance, but Commando owners have an ideal chain in IWIS and JWIS that is light weight, has long life, needs minimum adjustment, etc. Why would they swap to a heavier chain and still have a wider link.
If anything the solution for classics would be like that used on some of the latest 900cc plus bikes out there, I had to read it twice but they must be using some high strength chain. Maybe this is driven by weight or minimising the use of materials, or they are sacrificing life for weight. Either way, another reason the 10190 spec needs updating.
In the world today where we can design lighter, stronger, better etc, it seems strange to use a standard which was overkill when it was conceived as they had limited design tools and software unlike today where it can refine that design and spec.
Personally, I think Renold have missed a trick with introducing a 10190 spec chain. Classic chain for motorcycles and the 10190 spec from 1992, 2008 etc should be two different chains.
I will check what chain is on the original drawing that is recommended, if I remember rightly it refers to an old Renold number for the Norton Commando, reason being is that the connecting link for that chain in the 70's cleared the inner chaincase, but as the standards changed and updated so did side plate thickness and thus the link width, just enough to reduce the clearance.
Realistically the ISO 10190 spec badly needs updating, a lighter decent 10B chain would most probably exceed the tests required in 10190, but if it did it still cannot be called ISO 10190 approved chain as it differs dimensionally to the spec, in which case it would need to be labelled 'exceeds the testing required by ISO 10190'
Clearly modern chain made to 10190 spec these days would smash the minimum test specs of 10190 out of the park and far exceed those required of 10B, which is why the spec is pretty pointless. The side plate thickness required of 10190 is far thicker and this makes for a heavier chain. This new chain, fantastic on Velocette, Vincent, Triumph etc where the link has plenty of clearance, but Commando owners have an ideal chain in IWIS and JWIS that is light weight, has long life, needs minimum adjustment, etc. Why would they swap to a heavier chain and still have a wider link.
If anything the solution for classics would be like that used on some of the latest 900cc plus bikes out there, I had to read it twice but they must be using some high strength chain. Maybe this is driven by weight or minimising the use of materials, or they are sacrificing life for weight. Either way, another reason the 10190 spec needs updating.
In the world today where we can design lighter, stronger, better etc, it seems strange to use a standard which was overkill when it was conceived as they had limited design tools and software unlike today where it can refine that design and spec.
Personally, I think Renold have missed a trick with introducing a 10190 spec chain. Classic chain for motorcycles and the 10190 spec from 1992, 2008 etc should be two different chains.
