SHIMANO SM-BC06 Nexus Internal Revo Shifter Crank SL-3S42E

( Brand: Shimano ), ( Manufacturer Part Number: SM-BC06 ), ( Model: NEXUS ), ( Part Type: Internal Crank Bell ), ( Color: Black ), ( Compatible Bike Type: Universal, Beach Bike, Cargo Bike, City Bike, Cruiser, Fitness-/crossbike, Hybrid Bike, Trekking Bike ), ( Set Includes: Cables, Shifters, Bell Crank ), ( Number Of Speeds: 3 Speed )

Review SHIMANO Nexus Internal Speed 3s Revo Shifter Bell Crank

The **Shimano SM-BC06 Nexus SL-3S42E Internal 3-Speed Revo Shifter Crank** is a compact yet highly efficient drivetrain solution designed for urban commuters, cargo bikes, and light-duty utility applications where space and simplicity are paramount. Engineered with Shimano s renowned precision and durability, this internal gear hub system integrates seamlessly into the frame, eliminating the need for external derailleurs and chains while delivering smooth, reliable shifting across three gears. The **Revo Shifter** mechanism, a hallmark of Shimano s Nexus lineup, ensures effortless operation with a single lever mounted on the handlebar, allowing riders to seamlessly transition between the low gear ideal for steep inclines or heavy loads and the high gear perfect for cruising on flat terrain or maintaining momentum. The **SL-3S42E** designation signifies a 3-speed configuration with a 42mm chainring, striking a balance between torque and efficiency for practical urban riding. Built to withstand the demands of daily commuting, this crankset features a robust **31.8mm B-free hub interface**, compatible with a wide range of frames and forks, while its **internal routing** keeps the drivetrain clean, reducing maintenance and protecting components from dirt and debris. Whether navigating city streets, hauling groceries, or tackling light off-road trails, this crankset delivers a blend of functionality, ease of use, and long-term reliability, making it an excellent choice for riders who prioritize convenience without compromising performance.

The Shimano SM-BC06 Nexus SL-3S42E is an internal gear hub (IGH) system designed for simplicity, durability, and low maintenance. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

---

### **Pros**

1. **Simplicity and Low Maintenance**

The Nexus SL-3S42E is an internal gear hub, meaning all shifting and drivetrain components are enclosed within the rear wheel. This eliminates the need for a traditional derailleur, chain, cassette, and shifters, reducing the risk of derailments, chain drops, and wear from dirt or debris. The system requires minimal lubrication and no chain adjustments, making it ideal for casual riders, commuters, or those who prefer a hassle-free setup.

2. **Durability and Reliability**

Internal gear hubs are known for their robustness. The SL-3S42E features a sealed design that protects internal components from moisture, dust, and corrosion, which is particularly beneficial in wet or dirty conditions. The gear mechanism is also less prone to damage from impacts compared to external derailleur systems. Shimano s reputation for quality ensures consistent performance over time, even with moderate use.

3. **Low Cost of Ownership**

Since the system requires minimal maintenance, the long-term cost is lower than that of a traditional derailleur setup. There s no need to replace worn chains, cassettes, or derailleurs frequently. Additionally, the initial cost of the hub and compatible crank is often lower than a full mid-range or higher drivetrain.

4. **Smooth and Quiet Shifting**

The SL-3S42E offers three gears (low, medium, high) with relatively smooth transitions, though the gear range is limited compared to multi-speed derailleur systems. The internal shifting mechanism is designed to minimize noise and vibration, providing a quieter ride than many external derailleur setups.

5. **Compatibility with a Wide Range of Wheels**

The SM-BC06 hub is compatible with a variety of wheel sizes and types, including standard road wheels, hybrid wheels, and even some mountain bike wheels (depending on the rim width). This flexibility makes it a versatile choice for different riding styles.

6. **No Chain or Derailleur to Get Caught**

For casual riders or those who may not be as careful with their bike, the absence of a chain and derailleur reduces the risk of accidents caused by the chain snapping or the derailleur catching on obstacles.

7. **Good for Commuters and Urban Riding**

The simplicity of the system makes it well-suited for commuting, where reliability and low maintenance are priorities. The limited gear range is sufficient for most urban environments, where steep hills are rare.

8. **Easy Installation and Removal**

Internal gear hubs are straightforward to install, especially if you re replacing an existing hub. They can also be easily removed for maintenance or replacement, though the process requires some basic bike tools and knowledge.

---

### **Cons**

1. **Limited Gear Range**

The SL-3S42E offers only three gears, which may be insufficient for riders who frequently tackle steep hills or require a wide range of speeds. While the gears are adequate for flat terrain or light inclines, they may feel restrictive on longer climbs or high-speed descents. Riders who prefer a more varied gear selection (e.g., 7, 8, or 10 speeds) will find this system limiting.

2. **Less Efficient for Performance or Long-Distance Riding**

For serious cyclists, road racers, or those who ride long distances, the lack of multiple gears can make pedaling more strenuous, especially in challenging conditions. The gear ratios may not optimize cadence or power transfer as effectively as a multi-speed derailleur system.

3. **Weight**

While internal gear hubs are durable, they are generally heavier than lightweight derailleur setups. The added weight may not be noticeable on a casual ride but could be a consideration for performance-oriented riders who prioritize weight savings.

4. **Less Customizable**

Unlike derailleur systems, which allow for a wide range of gear ratios and cassette options, the SL-3S42E s gear ratios are fixed. You cannot adjust the gearing to suit specific riding conditions or preferences. This lack of customization may be a drawback for riders who like to fine-tune their drivetrain.

5. **Potential for Higher Initial Cost for Full Setup**

While the hub and crank themselves are affordable, you may need to purchase a compatible frame or fork, as not all bikes are designed to accommodate internal gear hubs. Some frames may require modifications or may not be available with IGH compatibility, which could increase the overall cost of the bike.

6. **Limited Availability of Spare Parts**

Shimano s internal gear hub systems are less common than derailleur setups, so finding replacement parts or servicing the hub may be more difficult. While the system is designed to be low-maintenance, if something does go wrong, repairs might require specialized knowledge or tools.

7. **Less Common in High-End or Performance Bikes**

Internal gear hubs are typically found on budget-friendly or utility bikes rather than high-performance road or mountain bikes. If you re looking for a bike that aligns with performance cycling culture, you may find IGH systems less appealing or socially less acceptable in some circles.

8. **Potential for Gear Misalignment Over Time**

While rare, internal gear hubs can occasionally develop issues where the gears do not shift smoothly or may get stuck. This is usually due to wear and tear over many years of use. Regular maintenance can mitigate this risk, but it s something to be aware of.

---

### **Conclusion**

The Shimano SM-BC06 Nexus SL-3S42E internal gear hub is an excellent choice for riders who prioritize simplicity, durability, and low maintenance over gear versatility and performance. It is particularly well-suited for casual riders, commuters, and those who prefer a hassle-free riding experience without the need for frequent adjustments or high upkeep. The system excels in environments where reliability and ease of use are more important than a wide range of gears or lightweight components.

However, if you are a performance-oriented rider, a frequent climber, or someone who enjoys long-distance cycling with varied terrain, the limited gear range and lack of customization may make this system feel restrictive. In such cases, a traditional derailleur setup with multiple gears would likely be a better fit.

---

### **Recommendation**

- You are a casual rider or commuter who values simplicity and low maintenance.

- You ride mostly on flat or gently rolling terrain and do not require a wide range of gears.

- You want a durable, reliable, and low-cost drivetrain that requires minimal upkeep.

- You prefer a setup that is less prone to derailments, chain drops, or wear from dirt.

- You are looking for a bike that is easy to maintain and does not require frequent adjustments.

- You frequently ride on steep hills or varied terrain and need a wider range of gears.

- You are a performance-oriented rider who prioritizes lightweight components and gear customization.

- You plan to use the bike for long-distance rides where gear efficiency is important.

- You are looking for a bike that aligns with high-performance cycling culture or racing.

- You anticipate riding in extreme conditions where the limited gear range may be insufficient.

For most casual riders and commuters, the SL-3S42E is a practical and cost-effective choice that delivers on reliability and ease of use. If you fall into one of the categories where gear range or performance is a priority, consider a traditional derailleur system instead.

Details:

In very good condition, used lightly.

part #: smbc06 prices

• $11.97-$24.97

specifications ribicycl:

• brand: Shimano
• mpn: Sm-bc06
• model: Nexus
• part type: Internal Crank Bell
• color: Black
• compatible bike type: Universal, Beach Bike, Cargo Bike, City Bike, Cruiser, Fitness-/crossbike, Hybrid Bike, Trekking Bike
• set includes: Cables, Shifters, Bell Crank
• number of speeds: 3 Speed

shipping ribicycl:

• class: Standard
• cost: $14.00
• service: USPS Ground Advantage
• type: Calculated
• transit: 7-12 Days
• carrier: USPS

general ribicycl:

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

offer ribicycl:

• availability: In Stock
• sold: 0
• best offers: True
• quantity: 1
• options: Ship-to-home
• started: February 5, 2026

returns ribicycl:

• policy: No Returns

payments ribicycl:

• credit card: Discover
• other
• wallet: Apple-pay

seller ribicycl:

• rating: 100.0%
• # reviews: 160
• city: Oakdale, California

Shimano SM-BC06 Is Similar To:

• 02206 Shimano Ez Fire Speed Right Hand Bike Bicycle Gear Lever (34% similar) ...(August 15th, 2018)
• 101692 Ceramicspeed New Pulley Wheels Shimano Speed Alloy Black 5711050004454 (24.4% similar) Retail price is manufacturers suggested and may not reflect actual selling prices. Alternatively, please go to purchase history and find the order you want cancel. New ceramic speed pulley wheels Shimano 11 speed alloy black assemblies for ISP system only. Ceramic speed pulley assemblies for ISP ...(November 2nd, 2018)
• 101694 Ceramicspeed New Pulley Wheels Shimano Speed Red 5711050004478 (23% similar) Ceramic speed pulley assemblies for ISP system only. Alternatively, please go to purchase history and find the order you want cancel. Retail price is manufacturers suggested and may not reflect actual selling prices. New ceramic speed pulley wheels Shimano 11 speed red assemblies for ISP system only...(November 2nd, 2018)
• 11411s0 Connex New By Wippermann Speed Chain Shimano Sram 4041319002046 (14.7% similar) Return exchange instructions provided on included receipt. The value-priced steel chain offers all new design features and convincing gear-changing properties of our 10-SPEED series. One new Superman convex steel chain link Shimano, campanile, scram 11 speed compatible size: speed, 1/2 x X118 color...(December 11th, 2018)
• 1248585 Shimano Nexus Sg-3d55 3speed (40% similar) Direct drive, 3RD gear includes shifter, bell-crank, and 1560MM shift cable with housing 2ND no tags, has never been used Shimano nexus SG-3D55 3-SPEED disc brake internally geared hubs 3 speeds with a 186 gear range: 1ST...(January 23rd, 2018)
• 152360070023d Miche Shimano Middle Position Cog Speed (30.3% similar) Michel Shimano 23T middle position cog 10 speed 10-SPEED cogs for...(August 31st, 2018)
• 16081 Kmc Speed Fits Shimano Sram Mountain Hybrid Bike 766759950064 (17.8% similar) ...(December 20th, 2018)
• 18431 Sunlite Bicycle Freewheel Free Wheel Speed Fits Shimano 072774184316 (14.4% similar) Shimano equivalent MF-TZ20...(November 18th, 2018)
• 2309-321 Shimano Octalink Bottom Bracket With Fixing Bolts (32.1% similar) I think this came from a non-series Shimano crank, but it will work with several crank arm model's. This is for an octal ink v2 interface BB with spindle length of 113MM and bottom bracket width 73MM. I'm listing this as used, but it was a takeoff from set of cranks I swapped over several years ...(November 3rd, 2018)
• 2a4.fw.7.566 Miche Shimano Splined Speed Cassette (35.9% similar) 5MM body type Shimano scram 8, 9, 10 speed cassette COGS11 27RANGE11-27DRIVETRAIN SPEEDS10 Michel cassettes use individual cogs and spacers which allow for easy customization of ratios does not fit Chris king hubs individual are also sold separately Shimano-splinted come with 30...(August 31st, 2018)
• 36bs98030 36bs98040 Shimano Ultegra Sti Shifter Name Face Plate Cover Pair Left (38% similar) This is a right and left pair of ultra shift lever front cover pieces for non-flight deck model's that are gone to history extremely hard find...(August 14th, 2018)