The 12-30T Ultegra 6700 cassette is perfect for riders who are seeking additional climbing gears without the hassle of running a triple. The cassette features an alloy carrier and drilled larger cogs to shed a few grams. Improved teeth profiles give the Ultegra 6700 cassette fantastic shifting even under high load. Theses cassettes are compatible with Shimano Ultegra RD 6700-A rear derailleurs, SRAM 10-speed WiFli rear derailleurs and 10-speed mountain drivetrains.
This cassette requires a rear derailleur that can handle the larger 30T cog. Some shorter cage rear derailleurs may not be compatible.