You'll need the freewheel installer/remover tool, but to remove the old cassettes you can probably just hold them with channel locks instead of buying that special cassette holding tool.

seems to be holding up to my beating, haha. no problems with quick wear or coming loose. i like it.

very smooth good chain line over all very good product i have nothing bad to say thanks jenson usa for the good prices and alright shipping prices

i used this product beyond the time i expected it to last. it is a great way to avoid shelling out the dough for a new hub and freewheel. the chainline may not be perfect in all instances but it was for me and with the varying spacer widths it should be close.

put on, took off in ten mins because couldn't get good chainline. Do not buy, it is a waste. jenson needs a no star option just for this product.

Ingenuity required to acquire the proper chainline. The cogs are stamped steel and in time digs into your freehub. I replaced the freehub (XT disk) with solid splines for a fix. I used the Gusset on another wheel and had to use an additional spacer (not provided) so that I could lock the cluster. Not user friendly, but is far more attractive to any other alternative spacers.

It's a simple piece that everybody must have, easy to install, works really great and totally strong, it didn't skip. I suggest to use a chain tensor for additional protection and a better average.

Like another reviewer, I cannot get a straight chain line with this thing! I have a single-speed crankset in front (Truvativ Style SS) and have tried with double bashguard setup + spacers and with the default outside-bashguard setup. In both scenarios, the chain line is off, causing skipping -- or worse, dropping my chain (with single bashguard). I cannot improve the situation in the rear (swapping the spacers would make the problem worse). ... So I'm now going to cough up the extra $$ for the far more adjustable Surly setup.

Good value, but you may have to be patient and use some imagination to get it working. Would be better with more complete instructions.

It is next to impossible to get a good chain line with this thing. I bought it, regretted it, and have now bought the more expensive Surly kit, which I should have bought in the first place. Those guys do things right. This device just does not provide the adjustment needed. I though it might work until the first climb, when I could feel the chain trying to climb off the gears.