Fine-tuning your Shimano 12-speed electronic road derailleur? This special adjustment ruler makes it precise and easy. It's designed specifically for groupsets like R7100, R7150, RX820, R8150, and R9250. You use it to set the perfect position of the derailleur relative to the largest sprocket, ensuring smooth, accurate shifting. It's made from polymer using 3D printing, so it's lightweight and accurate. The set includes 2 rulers and some stickers. A handy tool for bike mechanics or keen cyclists who like to do their own maintenance. Takes the guesswork out of derailleur setup.
