Product Description : Remove and install Shimano and SRAM Cassettes, and CenterLock Rotors with the Park Tool FR-5/FR-5G Lockring Removal Tool.Product FeaturesMaterial: steelCompatibility: Shimano, SRAMOther Tools: Weight: Recommended Use: cassette, CenterLockManufacturer Warranty: lifetime Like all Park tools, this one is nicely made and has a good "feel" to it. Unless you're a professional bike mechanic, you probably won't use this tool often--but when you need it, nothing else will work. I may not use it again for years--but it's nice to have it in my toolbox, just in case.A couple of notes for beginners: you will also need 1.) a chainwhip, and 2.) a big Crescent wrench. I learned this the hard way. If you have all three tools, you can remove your cassette in a couple of minutes. If you don't have all three tools, forget it! (Most people probably already know this, but I guess I was a slow learner!) This my review for the FR-5G from Park tool.There is not much to it.It is a very good quality piece. It seems to be machined out of a very high quality steel,stainless or other solid metal ( heat treated maybe). The finish will keep it from corroding for a very long time. The guide pin is removable and screws on and off. It is supposed to work on Shimano, Sram, Suntour, Sunrace, Chris King, etc but I have only tried it with my Shimano Megadrive and works great!The price might be a couple dollars higher that a normal FR-5 which does not have the guide pin. The guide pin is not necessary and usually the axle skewer can be used as a guide. It is up you which one you buy. I just figured better safe than sorry (in case the skewer trick does not work), plus you get the precision and quality of Park Tool. I actually have the version of this Park tool with a spindle that goes into the hollow quick release style axle. It removes the lockring that holds the gear rings on the cassette's spline body. You might think you would never want to remove those, but it is a handy thing to do for cleaning grit and gunk from your cluster. Just remove them and soak them in a cleaning solution, rinse, dry, and reinstall. Also, removing the gear rings gives you more room if you need to adjust the bearing cones or allows you to replace a worn ring. But, the back five or six gear rings are riveted together in one piece. This tool did not fit the cheap cassette on my wife's Wal-Mart bike, though. A chain whip or the careful use of a pipe wrench is a necessary auxillary tool to hold the cassette so it does not turn when removing the retaining ring.
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