Choosing the right crank drive components can dramatically improve the feel, efficiency and reliability of your e-bike. This guide highlights top crank arms and related drive parts from reputable brands, helping UK riders optimise performance on varied terrains. Each selected item is compatible with popular mid-drive systems, offering durable aluminium construction, precise engineering and straightforward installation. Read on to compare options and build a smoother, more capable e-bike experience.
| Product | Brand | Key Feature |
|---|---|---|
| BAFANG E-Bike Crank Arm Aluminium Alloy 2 Pieces | BAFANG | Durable, improved performance, mid-drive compatibility |
| Prowheel One Pair Crank Arm 170mm | Prowheel | Forged Alloy 6061, square taper, multiple sizes |
| BAFANG Bicycle Crank Arm 170mm One Pair | BAFANG | Perfect fit for BBS01/02/HD motors |
| BAFANG E-Bike Crank Arm Aluminium Alloy Left Single | BAFANG | Left chain crank for compatibility with BBS motors |
| BAFANG E-Bike Crank Arm Aluminium Alloy Right Single | BAFANG | Right chain crank for BBS motors |
BAFANG E-Bike Crank Arm Aluminium Alloy 2 Pieces
The Bafang crank arm set is designed for mid-drive systems and uses high quality aluminium alloy for durability in demanding riding conditions. Key benefits include improved performance through lightweight construction and precise engineering, which translates to smoother, more stable rides. This two-piece pair is compatible with most Bafang mid-motor configurations, enabling straightforward integration into existing e-bike setups. The robust aluminium material resists wear while maintaining a balanced weight for better handling on climbs and technical trails.
Prowheel Crank Arm 170mm For E-Bikes
Prowheel’s crank arms are forged from high-quality Alloy 6061, delivering strength and resilience for electric bicycles. Available in multiple lengths (including 170mm), these crank arms suit square taper spindles and are specifically intended for e-bike use. Prospective buyers should confirm that the crank length matches their riding style and ensure compatibility with their bike’s square taper orientation. The product emphasises durability with high hardness and resistance to deformation, making it a reliable upgrade or replacement for daily commuting or leisure rides.
BAFANG 170mm Crank Arm Set For BBS Motors
This Bafang crank arm set is a precise fit for BBS01, BBS02, BBS01B, BBS02B and BBS-HD motors. Crafted from high-quality aluminium alloy, the arms aim to maintain stiffness while reducing overall weight. The design is tailored to ensure a secure interface with Bafang mid-drive systems, providing reliable power transfer and smoother pedalling. As a replacement or upgrade, these arms help maintain efficient interaction between rider input and motor output across a range of speeds and terrains.
BAFANG Left Single Crank Arm For BBS Mid-Drive
The left single crank arm variant is designed to accompany Bafang mid-drive motors, with emphasis on smooth integration and stable performance. Manufactured from aluminium alloy, it aims to deliver a balance of durability and lightweight handling. The product is positioned for compatibility with BBS01, BBS02, BBSHD and M200 families, provided the original crank interface features a diamond hole. This makes it a targeted option for riders upgrading power delivery and pedalling efficiency on compatible e-bikes.
BAFANG Right Single Crank Arm For BBS Motors
This right single crank arm complements the left variant for cohesive operation with BBS mid-drive motors. The product description highlights its aluminium alloy construction and its role in optimising gear engagement and pedalling efficiency. Intended for Bafang BBS-based systems, it delivers robust performance with dependable torque transfer. As with other crank arms, ensuring correct spindle interface and compatibility with the motor type is essential for a trouble-free upgrade or replacement.
Buying Guide
- Compatibility: Confirm your bike’s motor type (BBS01/02/HD, M200, or other mid-drive systems) and ensure the crank arm’s interface (square taper or diamond hole) matches your crankset.
- Crank Arm Length: Typical lengths range 152mm to 175mm. Choose a length that matches your leg length and riding style to maintain efficient pedalling geometry and comfort.
- Material and Durability: Aluminium alloy offers a good balance of lightness and strength, resisting deformation under typical e-bike loads. Higher rigidity improves stability, especially on hills.
- Single vs Pair Sets: A two-piece or pair set can simplify replacement when both sides wear evenly. Singles may be preferred if only one arm is damaged or to preserve a known good side.
- Installation and Alignment: Correct spindle orientation and alignment are essential. Check for square taper compatibility and ensure both arms are mounted with matched hole patterns.
- Brand Confidence: Reputable brands with motor-specific compatibility reduce the risk of drivetrain issues and ensure better warranty support.
- Maintenance: Regular inspection for play, wear, and looseness helps prevent premature failures. Clean and lubricate contact surfaces during service intervals.