Altus Shimano Cassette Sprocket CS-HG31
- 8-speed cassette, 11-32T range
- Hyperglide shifting
- Black zinc phosphate finish, alloy steel
- 1.6 ounces item weight
- Limited warranty
Last refreshed Oct 3, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
An eight speed cassette with a wide range for climbing and a black zinc phosphate finish. The listing carries a few doubtful fields, so the title and highlight are the reliable ones.
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ASIN: B005DTWZMEModel: ECSHG318132Category: Cassettes & Freewheels
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Overview
Shimano's Altus CS-HG31 is an eight speed cassette built with Hyperglide shifting profiles on its cogs. The black zinc phosphate finish covers an alloy steel body.
A wide range up to the largest cog suits hilly rides and loaded bikes, and the shifting profiles aim at consistent changes. Fields such as the tooth count and mount type look wrong, so skip those rows.
Who it's for
Mountain and commuter riders with an eight speed freehub who want easier climbing gears will fit this directly. Riders on other speed counts or different freehub styles should check compatibility first.
Pros and cons
- Wide gear range
- Black zinc phosphate finish
- Alloy steel build
- Tooth count and mount fields look wrong
- Freehub type not stated
- Eight speed only
Performance notes
Shaped cog teeth and ramps help the chain climb between cogs, and a larger big cog lowers the lowest gear for steep ground. A zinc phosphate coat resists rust, but a worn chain will still skip on new cogs.
Where it stands among cassettes & freewheels
- #5 most-searched brand and model of the 24 cassettes & freewheels lines we track (by search demand, not sales).
From the specs of the 15 cassettes & freewheels we list; not a test result.
Specifications
| Model | ECSHG318132 |
|---|---|
| Dimensions & fit | |
| Item weight | 1.6 ounces |
| Capacity & performance | |
| Speeds | 8 |
| Construction & materials | |
| Case Material Type | Alloy steel |
| Color | Black |
| Warranty & support | |
| Warranty Description | Limited Warranty |
| Other details | |
| Number of Teeth | 11-32T |
| Item Type Name | Cassette (11-32T 8 Speed) |
| Part Number | CS-HG31 |
| Shifting | Hyperglide |
Frequently asked questions
How do I care for the Shimano Altus CS-HG31?
The listing gives no care steps. It has a zinc phosphate black finish, so keep it clean and lightly oiled with the chain.
Is the CS-HG31 an eight speed cassette?
Yes. The highlight says 8-speed, 11-32T.
Why does the listing show 43 teeth?
That figure does not match an 11-32T range and looks like a listing error.
Does it need a particular freehub?
The listing does not name one. Check your hub.