Originally Posted by
secret_squirrel
I would take slight issue with the proprietary comments for the Sun Race - the outsides and cassette are pure Shimano standards namely Capreo (...)
I had heard rumors before about this, nice to know.
Afaik Shimano doesn't make Capreo anymore, and
afaik noone else makes compatible cassettes, so de facto it's a Sunrace only system, with limited availability. But perhaps "proprietary" isn't the right word.