- 221
- 2
- 3
- 8/7
- 20T
- 47.5/50
Specifications
As listed in the manufacturer's catalog.
General
- Series
- SHIMANO ALTUS
- Color / 1
- Series color
- Front speeds
- 3
- Rear speeds
- 8/7
- Compatible chain
- HG 8/7/6-speed
- Action / TOP SWING
- Yes
- Cable route type / Dual-pull
- Yes
- Chain line (mm)
- 47.5/50
- Top gear teeth
- 42T, 48T
- Total capacity
- 20T
- Applicable top-mid tooth difference
- 10T
- Angled clamp band design
- Yes
Mount
- Clamp band (mm) / 28.6
- ✔ (w/ S size adapter)
- Clamp band (mm) / 31.8
- ✔ (w/ M size adapter)
- Clamp band (mm) / 34.9
- Yes
Front clamp band
- Material
- Steel
- Finish
- Painted
Rear clamp band, base bracket
- Material
- Steel
- Finish
- Painted
Clamp screw
- Material
- Steel
- Finish
- Nickel plated
Outer link
- Material
- Steel
- Finish
- Painted
Inner link
- Material
- Steel
- Finish
- Painted
Chain guide
- Material
- Steel
- Finish
- Chrome plated
Cable fixing screw
- Material
- Steel
- Finish
- Nickel plated
Stroke adjusting screw
- Material
- Steel
- Finish
- Zinc plated
How spec sheets write it
The most common ways bicycle spec sheets name it, by number of mentions.
-
Shimano Altus, FD-M310-M3, 3-speed
-
Shimano FD-M310, Topswing, 31.8mm
-
Shimano Altus M310
-
Shimano M310
-
Shimano Altus FD-M310
-
Shimano Altus, FD-M310-M6, 3-speed
-
Altus FD-M310 top swing
-
Shimano Altus 31.8mm 8spd
Bicycles
Published bicycles that use it, newest model years first.
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