Shimano HG400 9 Speed Mountain Bike Cassette - CS-HG400-9 11-36 ICSHG4009136
配合 Shimano HYPERGLIDE (HG) 链，HG 盒式链轮提供快速精确的索引移位。 电脑设计的链轮结合了专门定位的换档速度和齿轮设置，以改善换档期间的链条。 响应顺畅、噪音低的移位是*终的效果
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To install this cassette on a standard shimano hub, you need the hub tool, and a chain whip (really only needed to get the old cassette off, as use will further tighten the new cassette. If you use a torque wrench, the standard is 40 Newton meters, I think, but I could be wrong.
Of course you need a chain tool and maybe a "magic link" to replace the chain. The length may be different from your old chain if the size of the biggest sprocket is different from your old sprocket--and of course, if you're changing size (largest number of teeth on the cassette), you also need to be sure your derailleur still works.
There isn't much else to say. I would say I got an actual shimano part, but if it was a fake, it was meticulous in every detail--seriously, it was just the actual shimano part in the standard shimano packaging. That's what I wanted and that's what I got!
When to replace? If you've worn out 8 or 10 chains, you've probably also worn out the cassette. If a new chain does not rest in the valleys between the teeth of your most used gear on the cassette, it will definitely wear the chain and hinder your power transfer and smooth gear changes. It can even get sort of stuck on the teeth!
The only bad thing about it would be the way the gears interface with the freewheel. Each cog fits onto the freewheel separately, so you need to use a steel freewheel or it will eat into the freewheel body, when the cassette bolts eventually loosen. One other concern is the way the cassette is constructed, the bigger cogs are very long and might have a tendency to flex, but the new spacers help because they are wider than traditional ones and should strengthen it almost as well as a spider type cluster.
So if you're on a tight budget, and need real mountain gear ratios for your 9 speed 29er, this is the one you need.
Deore 9-Speed Mountain Bicycle Rear Derailleur - RD-M592.
HG400 9 speed, 12-36 cassette.
Shimano Altus 9 speed shifters.
KMC 9 speed chain.
Originally wanted to go up to 10 speed, 11-36 cassette, but the 9 speed offers the same top end 36 tooth ring, at a much lower cost for the whole package, a no brainer. Very satisfied.