Originally Posted by
TenGrainBread
The SP branding was exclusively for Schwinn's Voyageur SP touring bike at that time. I don't think there was anything functionally different about it. In the 70s and 80s Schwinn branded tons of Shimano components for their OEM spec.
Thank you, I didn't knew that, I looked at the Schwinn online catalogs and it was only used on the 1982 Voyageur SP. I did see a 1982 Moots with one on the rear and thought it might have been made for that company, I'm glad you clarified that.