Shimano Altus FC-M311-L Black 170 x 28/38/28T
- 170 mm crank arms, 48/38/28T chainrings
- 7 to 8 speed drivetrains
- Square taper JIS bottom bracket, sold separately
- 50 mm chainline, for 135/142 hubs
- 9/16 inch pedal spindle
- 2.7 pounds, aluminum arms
Last refreshed Oct 3, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A triple mountain bike crankset with aluminum arms and steel chainrings for seven or eight speed bikes. The bottom bracket is a separate purchase, and the title lists the chainring size differently.
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ASIN: B005531XR6Model: EFCM311C888CLCategory: Cranksets
Overview
Upgrading a mountain bike with this Altus crankset swaps in aluminum arms and riveted SG-X steel chainrings on a three-piece design. Hyperdrive tooth shaping on the rings helps front shifts stay smooth.
A triple setup gives a wide gear spread for steep climbs, and steel rings wear longer than aluminum ones. The title and the specs list the chainrings differently, so confirm before ordering.
Who it's for
Trail and casual riders with a square taper JIS bottom bracket will find a direct match. Owners of other bottom bracket types or more gears should look elsewhere.
Pros and cons
- Aluminum crank arms
- Steel SG-X chainrings
- Three chainring range
- Standard square taper fit
- Bottom bracket sold separately
- Title and specs disagree on chainring size
- Limited to seven or eight speeds
Performance notes
Hyperdrive tooth shapes catch the chain during shifts, which makes front changes smoother under load. The chainline sets which cogs the chain lines up with, and an incorrect bottom bracket width will change that line.
Where it stands among cranksets
- #6 most-searched brand and model of the 15 cranksets lines we track (by search demand, not sales).
From the specs of the 15 cranksets we list; not a test result.
Specifications
| Model | EFCM311C888CL |
|---|---|
| Dimensions & fit | |
| Size | 170 mm |
| Item weight | 2.7 pounds |
| Capacity & performance | |
| Number Of Speeds | 7 to 8 |
| Construction & materials | |
| Material | Aluminum arms, steel chainrings |
| Color | Black |
| Included components | |
| Included Components | Crankset |
| Warranty & support | |
| Warranty Description | Limited Warranty |
| Other details | |
| Chainrings | 48/38/28T |
| Bottom bracket | Square taper JIS (sold separately) |
| Chainline | 50 mm |
| Pedal spindle | 9/16 inch |
Closest rivals on specs
Frequently asked questions
Does the Shimano Altus FC-M311 include a bottom bracket?
No. The description says square taper JIS bottom brackets are sold separately.
What chainring sizes does it have?
The specs and description say 48/38/28T, but the title lists 28/38/28T. Confirm the tooth counts before ordering.
How many speeds does it support?
Seven to eight speed drivetrains.
What pedals fit?
The listing gives a 9/16 inch spindle.