SHIMANO EFCM51002BCX66 Deore Crankset Double FC-M5100 36/26T 170MM 11SPD

( Brand: Shimano ), ( Manufacturer Part Number: EFCM51002BCX66 ), ( Compatible Brand: For Shimano ), ( Color: Gray ), ( Bottom Bracket Shell Type: Bsa ), ( Material: Aluminum ), ( Set Includes: Crankset ), ( Item Length: 10.830 ), ( Number Of Speeds: 2 Speed ), ( Crankarm Length: 170 Mm ), ( Item Height: 6.890 ), ( Compatible Bike Type: Mountain Bike ), ( Number Of Chainrings: Double ), ( Item Width: 7.430 ), ( Part Type: Crankset With Chainring )

Review SHIMANO Deore Crankset Double 36/26t 170mm Used Good Condition 11spd

The **Shimano Deore FC-M5100 36/26T Double Crankset (EF-CM51002-BCX66)** is a robust, performance-oriented entry into Shimano s mid-range Deore lineup, designed to deliver a balanced blend of efficiency, durability, and value for cyclists seeking a reliable yet capable drivetrain. Engineered with Shimano s signature precision, this **170mm BCD (bolt circle diameter) double crankset** features a **36-tooth large chainring paired with a 26-tooth small ring**, offering a versatile gear range that caters to both climbing efficiency and smooth cruising. The **11-speed compatibility** ensures seamless integration with Shimano s broader Deore or lower-tier Deore XT groupsets, making it an ideal choice for road, gravel, or light touring applications where a compact yet practical gear spread is desired. Constructed from **high-strength forged aluminum**, the crank arms are built to withstand the rigors of daily riding, from urban commutes to weekend adventures, while the **double-sided bottom bracket** (BCX66) provides a secure, low-friction interface for the spindle, enhancing durability and reducing maintenance needs. The **34mm hollowtech II spindle** further reinforces the crankset s robustness, ensuring longevity even under moderate stress. Whether paired with a road bike s lightweight frame or a more rugged gravel setup, this crankset strikes an excellent balance between performance and practicality, making it a standout option for riders who demand reliability without sacrificing efficiency. Its clean, minimalist design also ensures compatibility with a wide range of derailleurs and shifters, offering flexibility for custom builds or upgrades.

### **Pros and Cons of the Shimano Deore FC-M5100 Crankset (EF-CM51002BCX66, 36/26T, 170mm, 11-Speed)**

1. **Reliable Brand Reputation** Shimano is a well-established manufacturer known for durable, high-quality drivetrain components. The Deore series is a mid-range option that balances performance and cost-effectiveness.

2. **Good Value for Performance** The FC-M5100 is part of Shimano s Deore lineup, which offers better shifting precision and smoother operation compared to entry-level groupsets like Tourney or Altus. It s a solid choice for riders who want an upgrade without overspending.

3. **11-Speed Compatibility** The 11-speed drivetrain is widely supported, meaning you can pair it with other Shimano 11-speed components (cassettes, derailleurs, chains) without compatibility issues. This makes future upgrades easier.

4. **Lightweight Construction** The crankset uses aluminum, which keeps the weight down compared to steel cranks, improving pedal efficiency, especially on climbs.

5. **Durable Bearings** Shimano s bearings in mid-range cranks are generally robust, reducing the risk of premature wear or failure, though this depends on maintenance.

6. **Versatile Chainring Setup (36/26T)** The double chainring setup (36T large, 26T small) is ideal for a wide range of riding styles, including commuting, casual riding, and light trail use. The 36T provides better low-end torque for hills, while the 26T offers a higher gear for faster speeds.

7. **170mm BCD (Bolt Circle Diameter)** This is the standard BCD for most road and hybrid bikes, ensuring compatibility with a broad range of wheels and bottom brackets.

8. **Easy Maintenance** Shimano components are widely serviced, and replacement parts (spacers, chainrings, bottom brackets) are readily available.

9. **Smooth Shifting** The FC-M5100 uses Shimano s Deore-level shifting technology, which is more precise than lower-tier groupsets, reducing derailleur hop and improving efficiency.

10. **Future-Proofing** While not cutting-edge, the 11-speed standard is still widely used, and the crankset can be paired with newer Shimano components if you decide to upgrade later.

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1. **Not Entry-Level Performance** If you re coming from a very basic groupset (e.g., Tourney or Altus), the FC-M5100 will feel like a significant upgrade, but it s not as refined as higher-end groupsets like SLX or XT. Expect slightly more friction in shifting compared to top-tier Shimano.

2. **Limited Weight Savings Compared to Higher Tiers** While the crankset is lightweight for its class, it won t match the ultra-lightweight cranks found in higher-end groupsets (e.g., SLX or XTR). The difference may not be noticeable unless you re a competitive rider.

3. **Chainring Wear Over Time** The 36T chainring is more prone to wear due to its larger size and higher load-bearing, which may require replacement sooner than smaller chainrings. This is common with double cranks and not unique to this model.

4. **No Direct-Mount Options** This crankset uses a standard bottom bracket (BB86 or BB30, depending on your frame), which is fine for most bikes, but if you re using a frame with a direct-mount bottom bracket (e.g., some gravel or endurance bikes), you ll need an adapter.

5. **Price Point** While not extremely expensive, the FC-M5100 is more costly than entry-level cranks (e.g., Tourney or Altus). If you re on a tight budget, you might consider a used or refurbished higher-tier crankset (e.g., SLX) for better performance.

6. **Limited Customization** Unlike some higher-end cranks, this model doesn t offer customizable chainring sizes or spacers out of the box. You ll need to purchase additional spacers if you want to adjust the chainring position.

7. **Potential Compatibility Issues with Non-Shimano Parts** While 11-speed is standard, some aftermarket or budget components may not integrate as smoothly as Shimano s own parts. This is more of a general 11-speed issue than a specific crankset flaw.

8. **No Built-in Chain Stop** Some higher-end cranks include a chain stop to prevent the chain from falling off the smallest chainring. This model does not, which could be a minor inconvenience if you re not careful.

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The **Shimano Deore FC-M5100 crankset (36/26T, 170mm, 11-speed)** is an excellent mid-range choice for riders who want a reliable, smooth-shifting crankset without the premium price of higher-end groupsets. It strikes a balance between performance, durability, and affordability, making it suitable for commuters, casual riders, and light trail users. The double chainring setup provides versatility, and the 11-speed compatibility ensures long-term usability.

If you re upgrading from a very basic groupset and want noticeable improvements in shifting quality and drivetrain reliability, this crankset is a strong recommendation. However, if you re a performance-oriented rider or plan to race, investing in a higher-tier crankset (e.g., SLX or XT) might yield better results.

For most riders seeking a practical, no-frills upgrade, the **FC-M5100 is a solid and cost-effective choice**.

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- You re upgrading from a lower-tier groupset (e.g., Tourney, Altus) and want smoother shifting and better durability.

- You need a versatile double crank (36/26T) for commuting, casual riding, or light trail use.

- You prioritize Shimano s reliability and wide compatibility with other 11-speed components.

- You re on a budget but still want a quality mid-range option.

- You re a competitive rider or prioritize weight savings higher-end cranks (e.g., SLX FC-M7100) may offer better performance.

- You want a single chainring setup for simplicity (though this limits gearing options).

- You re using a frame with a direct-mount bottom bracket and need an adapter.

Overall, the **FC-M5100 is a well-rounded, practical choice** for riders who want a reliable mid-range crankset without unnecessary complexity.

Details:

SM-BB52 Pulled off bike and is in very good condition. Bottom bracket comes with it.

part #: efcm51002bcx66 prices

• $30.70-$89.99

specifications ribicycl:

• brand: Shimano
• mpn: Efcm51002bcx66
• compatible brand: For Shimano
• color: Gray
• bottom bracket shell type: Bsa
• material: Aluminum
• set includes: Crankset
• item length: 10.830
• number of speeds: 2 Speed
• crankarm length: 170 Mm
• item height: 6.890
• compatible bike type: Mountain Bike
• number of chainrings: Double
• item width: 7.430
• part type: Crankset With Chainring

payments ribicycl:

• money order
• wallet: Apple-pay
• credit card: Mastercard
• other

seller ribicycl:

• city: Chariton, Iowa
• # reviews: 9
• rating: 100.0%

returns ribicycl:

• time: 30 Days
• policy: Returns Accepted
• method: Money back
• paid by: Buyer

offer ribicycl:

• options: Ship-to-home
• best offers: True
• sold: 0
• availability: In Stock
• started: March 13, 2026
• quantity: 1

general ribicycl:

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

shipping ribicycl:

• class: Standard
• transit: 4-10 Days
• service: USPS Ground Advantage
• carrier: USPS
• cost: $11.99
• type: Fixed

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