Note location of welds to stays at bottom corner and top middle. Taiwanese (Chinese) Giant-Made MX-III (Series Three) inner BB – all four holes cut same as Japanese. Japanese MX-III (Series III) inner BB – Holes cut for all four connecting tubes to lighten frame further. US MX-III (Series III) inner BB – note holes cut for seat tube and down tube but not for chainstays.
US/Japanese MX-II inner BB – solid tubing all around. Also note – hotdog Redline stamp to left. Taiwanese (Chinese) Giant-Made MX-III (Series Three) bottom bracket – rounded down tube cut and less-sano welds. Japanese MX-III (Series III) – Oval Redline stamp, letters preceding serial, and squared off downtube cut. US MX-III (Series III) – Oval Redline stamp and serial number. US & Japanese MX-II - note squared off tube cut & plain serial number stamp (no oval or hot dog border around serial) So a total of four frames are examined here: A US made MX-II frame and fork are also compared to clarify differences between MX-II and MX-III (or series three) frames. These areas are compared below to help provide a quick reference when determining which frame you have. Main points of variation include the bottom bracket, dropouts, seat stays, and weld quality and placement.
The US, Japan, and China (Taiwan at the time) all made Redline frames.
Been meaning to do this thread on how to differentiate between early 80's MX-II and MX-III (Series Three) frames from various manufacturers.
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