SHIMANO CHAINRING SM-CRE70-B 34T STEPS

Shimano STEPS SM-CRE70-B Chainring – 34T (Boost)

Keep your e-bike drivetrain running smoothly with the Shimano STEPS SM-CRE70-B 34-Tooth Chainring. Designed specifically for Shimano STEPS mid-drive motor systems, this robust chainring delivers reliable chain retention and power transfer for e-MTB, trekking, and urban riding.

Featuring Shimano’s specialized DYNAMIC CHAIN ENGAGEMENT+ tooth profile, the SM-CRE70-B eliminates the need for heavy chain guides by holding the chain securely across rugged terrain and under higher e-bike torque. The “B” designation specifies a Boost-compatible chainline (53mm) to fit modern wide rear-hub axle spacing.

Key Features

• DYNAMIC CHAIN ENGAGEMENT+: Alternating tooth profiles hold the chain firmly in place to prevent chain drops, reduce wear, and deliver quieter drivetrain performance under load.

• Boost Chainline (53mm): Engineered for frames with 148mm rear axle spacing (Boost) to ensure proper chain alignment and shifting efficiency.

• E-Bike Specific Durability: Built from high-strength steel/aluminum to handle the elevated torque outputs of Shimano STEPS e-bike drive units.

• Sleek Integrated Design: Blends seamlessly with Shimano STEPS crank arms for a clean, factory-installed look.

Specifications

Compatibility Note

• Drive Unit Compatibility: Fits Shimano STEPS e-bike motor systems including DU-E8000, DU-E7000, DU-EP800, DU-EP801, and DU-E6100.

• Frame Spacing: Designed for Boost (148mm) rear hub dropout spacing. If your frame uses standard non-Boost spacing (135/142mm), look for the standard SM-CRE70 (50mm chainline) version instead.