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Learn how to upgrade a vintage road bike from a 6-speed to a 7-speed freewheel system in this informative 15-minute tutorial. Follow along as the process is demonstrated on a Japanese-made Lotus road bike, transforming it from a 12-speed (2x6) to a 14-speed (2x7) configuration. Discover the steps to install a 7-speed freewheel, upgrade to 7-speed SIS downtube shifters, and ensure compatibility with the existing rear derailleur and chain. Gain insights into this straightforward upgrade that can enhance your bike's performance and versatility.
