RACE FACE 13402002 Crankset Bike Aeffect Rocky Mountain 770416503401 155MM DYNAME4 Rmrcrfa Ra

( Brand: Race Face ), ( Manufacturer Part Number: 13402002 ), ( Part Type: Bike ), ( UPC: 770416503401 )

Review RACE FACE Crankset E bike Aeffect 155mm Compatible Rocky Mountain Rmrcrfa Ra

The **Race 13402002 Crankset for E-Bike (Affect 155mm Rocky Mountain Dyname4 RM-RCRFA-RA)** is a high-performance, precision-engineered component designed to deliver seamless power transfer and durability for electric mountain bikes equipped with the Rocky Mountain Dyname4 mid-drive system. Crafted from a robust alloy construction, this crankset is engineered to withstand the rigorous demands of off-road riding, including steep climbs, rough terrain, and aggressive pedaling, while maintaining optimal efficiency and reliability. The **155mm BCD (bolt circle diameter)** ensures compatibility with a wide range of chainrings, allowing riders to fine-tune their gearing for optimal climbing performance or aggressive descents, depending on the specific chainring setup. The **RM-RCRFA-RA** designation indicates its specific integration with the Rocky Mountain Dyname4 motor, which is renowned for its smooth torque delivery and advanced shifting technology, ensuring a responsive and natural pedaling experience even under heavy load.

This crankset features a **spindle-mounted design**, which not only enhances rigidity and power transfer but also simplifies installation and maintenance, as it eliminates the need for separate bottom bracket bearings. The **Affect brand** is known for its high-quality components, and this crankset exemplifies that commitment with its **closed-loop design**, which reduces friction and wear while extending the lifespan of the drivetrain. The **Rocky Mountain Dyname4** compatibility ensures seamless integration with the motor s internal derailleur system, allowing for effortless shifting between gears without the need for an external derailleur, a feature that significantly reduces the risk of chain drops and mechanical failures on technical trails. Whether tackling steep switchbacks, rocky descents, or long-distance rides, this crankset provides the strength and precision needed to handle the most demanding e-mountain biking scenarios.

Built to endure the harshest conditions, the **Race crankset** incorporates **hardened and polished bearing surfaces**, reducing friction and ensuring smooth operation even after prolonged use. Its **durable splined spindle** is designed to handle the high torque outputs of the Dyname4 motor, preventing premature wear and ensuring consistent performance over thousands of miles. Additionally, the **155mm BCD** allows for flexibility in chainring selection, enabling riders to optimize their gearing ratio for specific riding styles whether prioritizing climbing efficiency with a larger chainring or maintaining high-speed stability with a smaller one. The overall design emphasizes **minimalist yet robust engineering**, with every component carefully selected to enhance durability without compromising on weight or performance. For e-mountain bikers who demand both power and precision, this crankset is an essential upgrade, ensuring a reliable and efficient drivetrain that keeps pace with the demands of modern off-road riding.

**Pros and Cons of buying a Race 13402002 Crankset for an Affect E-Bike (Rocky Mountain Dyname4 RMCRFRA)**

### **Pros**

1. **Compatibility with Dyname4 System** The Race crankset is specifically designed to work with the Bosch Dyname4 mid-drive motor, ensuring seamless integration and optimal performance. This means you won t encounter compatibility issues with power delivery, torque, or sensor accuracy.

2. **High-Quality Build** Race cranksets are known for their durability and precision engineering. The 13402002 model is built to handle the demands of e-biking, including the additional torque generated by the motor, which can be more stressful on components than traditional bikes.

3. **Lightweight Design** The crankset is likely constructed from lightweight materials (such as aluminum or carbon fiber in some cases), reducing rotational mass. This can improve pedal efficiency and responsiveness, especially when climbing or accelerating with the motor s assistance.

4. **Reliability for E-Bikes** E-bikes place extra stress on drivetrains due to the motor s torque and weight. A dedicated crankset like this one is engineered to withstand prolonged use under these conditions, reducing the risk of premature wear or failure.

5. **Potential for Performance Upgrades** If you plan to customize your bike further, this crankset may offer better performance than a generic aftermarket part, especially when paired with a high-quality chainring setup (e.g., 32T, 34T, or 40T for climbing efficiency).

6. **Warranty and Support** Race components often come with manufacturer warranties, and since this is a Bosch-approved part, you may have access to Rocky Mountain s customer support for installation or troubleshooting.

7. **Future-Proofing** The Dyname4 system is a newer Bosch generation, and using an official crankset ensures compatibility with potential future software updates or motor upgrades (if Rocky Mountain offers them).

---

### **Cons**

1. **Cost** Bosch-approved or OEM cranksets are typically more expensive than third-party alternatives. If you re on a tight budget, you may need to weigh the benefits against the price difference.

2. **Limited Customization** Unlike some aftermarket cranksets, this part may not offer as many customization options (e.g., different chainring sizes or spindle lengths). You re essentially stuck with the configuration provided by Rocky Mountain.

3. **Potential Overkill for Casual Riders** If you primarily use your e-bike for leisurely rides with minimal motor assistance, the extra durability of this crankset may not be necessary. A more affordable generic crankset could suffice.

4. **Installation Complexity** Some Bosch-compatible cranksets require precise installation to avoid issues with the motor s sensors or chainline. If you re not experienced with bike maintenance, you may need to pay for professional installation, adding to the cost.

5. **Availability and Lead Times** OEM or Bosch-approved parts can sometimes have longer lead times or limited stock, especially if you re ordering directly from the manufacturer or a specialized retailer.

6. **Weight Consideration** While lightweight, some e-bike riders prefer even lighter cranksets (e.g., carbon fiber) for extreme performance. The Race crankset may not be the absolute lightest option available.

7. **Resale Value Impact** If you ever sell your bike, using an OEM crankset might not significantly boost resale value, as most buyers prioritize the motor, battery, and frame over the drivetrain.

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### **Conclusion**

The **Race 13402002 crankset for the Rocky Mountain Dyname4 RMCRFRA e-bike** is a **high-quality, reliable, and motor-compatible** choice that ensures optimal performance and longevity for your e-bike. It s particularly worthwhile if you:

- Plan to use the motor frequently (e.g., for commuting, long rides, or hilly terrain).

- Want to avoid compatibility issues with the Bosch Dyname4 system.

- Prioritize durability and precision over cost savings.

However, if you re a **casual rider** or on a **tight budget**, you might consider a **third-party crankset** (e.g., Shimano or SRAM) that s still compatible with the Dyname4, as long as it meets the torque specifications. Always verify that any alternative part is **Bosch-approved** to prevent power delivery or sensor issues.

---

### **Recommendation**

- You want the most seamless integration with your Bosch Dyname4 motor.

- You ride frequently under demanding conditions (e.g., heavy loads, steep climbs).

- You value long-term reliability and are willing to pay for a premium part.

- You re a budget-conscious rider who doesn t need the extra durability.

- You re comfortable with third-party brands (e.g., Shimano Deore or SRAM NX) that still meet Bosch s torque requirements.

- You plan to sell the bike soon, as the resale value impact may not justify the cost.

**Final Verdict:** For most serious e-bike users, the **Race crankset is the best choice** due to its compatibility, build quality, and performance benefits. However, always cross-check with Rocky Mountain or Bosch to ensure it s the exact part needed for your specific model.

Details:

Machining is clean and functional. Sold as seen. This is a custom modification ideal for riders needing shorter crank arm length EMT clearance, personal fit preference, or specific frame geometry.Whats INCLUDED: Race Face Atlas arms custom machined to 155mm originally 175mm Super Boost 151mm spindle Rocky Mountain Cinch system compatible parts/hardware SPECIFICATIONS: Crank length : from Spindle: Interface: Compatible with drive train setup condition: Used please view all photos.

part #: 13402002 prices

• $249.97-$400.28

specifications ribicycl:

• brand: Race Face
• mpn: 13402002
• part type: Bike
• upc: 770416503401

general ribicycl:

• Cycling > Bicycle Components Parts > Chains
• condition: Used

shipping ribicycl:

• class: Standard
• type: Calculated
• carrier: UPS
• service: UPS Ground
• transit: 4-7 Days
• cost: $13.17

offer ribicycl:

• availability: In Stock
• sold: 0
• options: Ship-to-home
• quantity: 1
• best offers: True
• started: May 3, 2026

returns ribicycl:

• policy: No Returns

payments ribicycl:

• credit card: Diners-club
• wallet: Google-pay
• other

seller ribicycl:

• # reviews: 1160
• city: Salem, Oregon
• rating: 98.6%

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