7割のロードバイク乗りが知らないRD不調原因の見つけ方【初心者向け】

I've been transferred to CDJ TOKYO since August 19, 2025. I'll listen carefully to your bicycle-related concerns and solve them. There are many causes for rear derailleur malfunctions, so if you don't know how to identify them, you can't take any measures. Learn an easy way to check. Know your enemy and victory is within your reach!!! For more information, please see [Road Bikes for Over 40s] → https://www.kinokuniya.co.jp/f/dsg-01... #RoadBikeMaintenance #LearnFromTheCause #ROADBIKE