KMC 104BCD 4 Arm Narrow Wide Steel E-Bike Chainring

KMC 104BCD 4 Arm Narrow Wide Steel E-Bike Chainring

The KMC 104BCD 4 Arm Narrow Wide Steel E-Bike Chainring is built for the additional torque and load generated by electric bike drivetrains. Made from durable steel and designed for 104 BCD 4-arm spider cranksets, it uses KMC's narrow-wide tooth profile to provide secure chain retention under motor-assisted power. Compatible with KMC e1, e8, e9, e10, e11 and e12 chains, it's a dependable choice for compatible E-MTB drivetrains.

• Built for e-bike loads: Designed to handle the increased torque and drivetrain stress generated by motor assistance

• Durable steel construction: Steel provides the strength required for demanding e-bike use

• Narrow-wide tooth profile: Helps maintain secure chain engagement under sustained power

• High drivetrain efficiency: Designed to minimise unnecessary friction and help preserve battery energy

• 104 BCD compatibility: Designed for 4-arm spider cranksets

Built for E-Bike torque

Electric motors place additional torque and load through the chain and chainring, particularly under sustained motor assistance. This KMC chainring uses a steel construction to provide the durability required for these conditions. The narrow-wide tooth profile uses alternating tooth widths to match the chain's inner and outer plates, helping maintain reliable chain engagement and retention.

Will this chainring fit my bike?

Compatible with:

• 104 BCD 4-arm spider cranksets

• 1, 8, 9, 10, 11 and 12-speed systems using compatible chains

Not compatible with:

• SRAM 12/13-speed Flat-Top chains

Check your crankset's BCD, chainring size and drivetrain specification before purchasing.

Technical specification:

• Available Sizes: 34T, 38T

• Speed: 1, 8, 9, 10, 11, 12-speed

• Material: Steel

• Type: Narrow-wide, single chainring

• BCD: 104 BCD

• Crankset: 4-arm spider

• Colour: Black

• Discipline: E-MTB

• Recommended chains: KMC e1 / e8 / e9 / e10 / e11 / e12