It is generally good practice to replace the chain when you replace the cassette.
This cassette will index with any Shimano-type 7-speed shifter, but does require a wide-range (touring/mountain) rear derailer.
-This cassette will index with any Shimano-type 7-speed shifter.
-This cassette will fit on any modern Shimano 7 to 10 speed cassette hub
-A spacer (see related items) is needed to use a 7 speed cassette on a 9 or 10 speed hub.