That’s fair enough regarding the tech not changing a lot.

On my other point though - is the “standard” Izumi chain the same as the eco which is mentioned in the beginning of this thread?
I can’t see the eco chain referenced anywhere or on the Izumi site. Is it possibly named differently in the states? ( or had its name changed?)

I have one of these standard chains which came in a green packet ( see pic). Is this the same as the "eco" which you refer to as a reference chain in your original post Carleton?
The reason i ask is that the standard chain on the izumi site is described as : "The ordinary chains which conform to international standards and are widely used in baby carriages,
sports cycles, minibicycles,etc." and i want to make sure im not going out sprinting with something not up to the task. Whilst im unlikely to ever break a chain the peace of mind is definitely beneficial to performance. ( i would rather not use the super toughness chains as they are very expensive and id have to buy two, one for big chainring combos and one for smaller - the dropouts on my Dolan DF4 are too short to be able to use a long chain for all combos).

Thanks for your help.