Ask most people who are up on their bike tech and they’ll know about Shimano’s clever Synchro Shift technology. Many people think that this design, which allows a rider to cycle through a multi-chainring setup with a single shifter, originated with Shimano’s XTR Di2 electronic transmission, but they’d be wrong.
Related: Shimano XTR Di2 M9050 transmission – long-term review
Actually, way back in the early 90s Synchro Shift existed as an obscure, fully mechanical device, which used a gripshift and two cables to control both the front and rear derailleurs of a bike. The system was produced as a CNCed aluminum unit and in cheaper, plastic versions and was compatible with triple eight- or nine- speed setups.
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Sorry about the quality – this is an image from the 90s after all…
Just like Shimano’s version today, the system followed a pre-programmed shift pattern that meant space was freed up at the handlebar and a good chain line was always maintained – and it simplified using the gears in the same way a modern 1x system does.
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