Shimano Altus M310 MTB Bike 1×8 Speed Rear Groupset RD-M310 Derailleur HG31-8 Cassette 11-32T/34T HG40 Chain

Option:
1, Rear derailleur: Rear derailleur (RD-M310)
2, Cassette(32T): Cassette (HG31-8,11-32T)
3, Cassette(34T): Cassette (HG31-8,11-34T)
4, Chain: Chain (HG40)
5, Full set(3PCS,32T): Rear derailleur (RD-M310) + Cassette (HG31-8,11-32T) + Chain (HG40)
6, Full set(3PCS,34T): Rear derailleur (RD-M310) + Cassette (HG31-8,11-34T) + Chain (HG40)
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Tips: 11-32T cogs more fits city bike, 11-34T cogs more fits MTB 
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Item: Rear derailleur
Model: RD-M310
Level: Altus
Color: Black
Speed: 7/8 Speed
Mount: Direct Mount
Compatible chain: HG 8/7/6-speed
Total capacity: 43T
Max sprocket: 34T
Min sprocket: 11T
Smart rear derailleur has a Wide Link design for increased rigidity and precise shifting
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Item: Cassette
Model: CS-HG31-8
Level: Altus
Speed: 8 Speed
Color: Black
Cogs type: Cassette
Compatible chain: HG 8/7/6-speed
Teeth:
11-32T: 11-13-15-18-21-24-28-32
11-34T: 11-13-15-17-20-23-26-34
Reliable and very durable
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Item: Chain
Model: CN-HG40
Level: Tourney
Speed: 6/7/8 Speed
Links: 116 Links
Type: HG 8/7/6-speed
Pin link plate: Gray
Roller link plate: Brown