Quad Bottom Brackets
Why introduce JIS square taper designs when every maker is moving away from them?
Because there are still many loyal fans who trust the square design, know how to maximize the square design, and have square taper cranks in their garages. All the squares out now are mostly cheap stuff you wouldn't dream of using on your 1995 Dura-Ace crank. IRD to the rescue. Made with Japanese quality by Tange Seiki.