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Don't just guess, use the GG Adjustment Gauge to properly set the correct gap between the upper pulley guide wheel and the cassette for flawless shifting. Designed to work with 12-speed Shimano gravel and road rear derailleurs. The round cut-out is perfect for hanging on the home shop peg board, so you know exactly where you left it.
This product was added to our catalog on April 17, 2024