Image Box rear derailleurs will be available in both clutch and clutchless with several cage lengths, both Shimano and SRAM compatible. Look for these on the Polygon UR team bikes. Credit Lee Trumpore Use keyboard arrow keys to browse the gallery. Swipe to browse the gallery. Prev Next 34 of 35Autoplay Autoplay SlowMedFast Share to Facebook Facebook Facebook Share to Twitter Twitter Twitter LTrumpore 3/19/2015 7:11am Share to Facebook Facebook Facebook Share to Twitter Twitter Twitter