SHIMANO BB-MX60 Dx Bottom Bracket School Bmx Racing Cranks 1980S

( Brand: Shimano ), ( Manufacturer Part Number: BB-MX60 ), ( Model: SHIMANO DX BB-MX60 MX61 MX62 ), ( Type: Bottom Bracket Crankset Cranks ), ( Color: Silver ), ( For Bike Type: Bmx Bike Old School Cruiser ), ( Country Of Origin: Japan ), ( Vintage: Yes )

Review SHIMANO Vintage 1980dx Bottom Bracket Old School Bmx Racing Rare Cranks

The **Shimano BB-MX60 1980s DX Bottom Bracket School BMX Racing Cranks** represent a rare and highly sought-after piece of cycling history, embodying the raw, unrefined spirit of early BMX culture when the sport was still in its wild, experimental phase. These cranks are a direct artifact of the late 1970s and early 1980s, a time when BMX was transitioning from backyard stunts and dirt jumps to competitive racing, and Shimano then a relatively young player in the cycling industry was pushing the boundaries of performance and durability for the burgeoning discipline. The **BB-MX60** designation itself hints at Shimano s early foray into BMX-specific components, designed to withstand the brutal demands of schoolyard races, high-speed jumps, and the relentless abuse of early BMX riders who treated their bikes like extensions of their own bodies. Crafted from high-grade steel, these cranks feature a **single-piece, square-taper design** a hallmark of the era with a **135mm BCD (bolt circle diameter)**, a standard that would later evolve into the more common 142mm but was revolutionary in its time for offering a wider spread of pedals, allowing for better power transfer and stability during the aggressive, low-geared riding typical of the era. The **DX (Direct Drive) bottom bracket** was another innovation, eliminating the need for a freewheel or cassette, simplifying the drivetrain while maximizing strength a critical feature for riders who prioritized raw speed and durability over modern efficiency.

Visually, these cranks exude the gritty authenticity of their time, often bearing faint signs of their rugged past: subtle wear on the pedal threads, minor corrosion from years of exposure to dirt, rain, and the occasional crash, and the occasional patina of oil or grease that speaks to their relentless use. The **black oxide finish** was standard for Shimano s early BMX components, providing a balance between protection against rust and a rugged, no-nonsense aesthetic that matched the sport s rebellious ethos. The **spindle** is typically a sturdy, slightly tapered steel shaft, designed to handle the lateral forces generated by BMX s high-speed turns and abrupt stops, a far cry from the precision-engineered components of today s high-end road or mountain bike setups. When paired with a matching **BB-MX60 bottom bracket**, these cranks form a drivetrain that was built for one purpose: **pure, unfiltered speed**. The lack of a freewheel meant that riders had to rely on their own pedal power to keep moving, a detail that added a layer of physicality and skill to the sport something that modern BMX riders, accustomed to freewheels and cassettes, can only imagine.

Beyond their mechanical significance, these cranks are a **cultural relic**, a tangible link to the golden age of BMX when the sport was defined by its DIY spirit, grassroots competitions, and the sheer audacity of riders who treated every street, park, and empty lot as their personal racetrack. Collectors and enthusiasts prize them not just for their rarity Shimano s BMX line was short-lived and never mass-produced in the same way as later models but for the **story they carry**. Whether you re a historian of the sport, a die-hard BMX purist, or simply a fan of mechanical nostalgia, these cranks offer a glimpse into an era when cycling was about more than just performance it was about **freedom, creativity, and the unshakable belief that anything was possible on two wheels**. For the modern rider or collector, restoring and riding these cranks is less about nostalgia and more about **honoring the legacy** of the pioneers who built BMX into the sport it is today. They are not just a drivetrain; they are a **piece of cycling history**, waiting to be brought back to life with the same grit and determination that defined their original riders.

The Shimano BB-MX60 bottom bracket and cranks from the 1980s, designed for BMX racing, have a niche appeal among collectors, vintage enthusiasts, and riders seeking a classic setup. Below is a detailed breakdown of their pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Historical Significance and Collectibility**

The BB-MX60 is a well-known part of BMX history, particularly from the era when Shimano dominated the sport. For collectors or riders interested in vintage BMX, owning these components can be a point of pride and a conversation starter. The design reflects the mechanical simplicity and durability of early BMX hardware, which has since evolved but retains a cult following.

2. **Durability and Simplicity**

The BB-MX60 bottom bracket and cranks were built for rough use, with robust construction to withstand the high-stress demands of BMX racing. The design lacks modern refinements like sealed bearings or precision machining, but this also means fewer points of failure. The crank arms are typically made from steel, which, while heavier than modern aluminum, is exceptionally tough and resistant to bending or breaking under impact.

3. **Compatibility with Vintage BMX Bikes**

If you re restoring or riding a classic BMX bike from the 1980s or early 1990s, these parts will fit seamlessly without the need for adapters or modifications. The bottom bracket shell standard (typically 73mm) and crank spindle size (usually 22mm) are consistent with many vintage frames, making them a straightforward choice for authenticity.

4. **Mechanical Reliability**

The BB-MX60 system relies on open bearings, which, while prone to dust and dirt, can be cleaned and regreased to function reliably. Many riders and mechanics appreciate the straightforward maintenance no complex tools or specialized knowledge are required to keep it running. This can be appealing for those who prefer "no-frills" mechanics or enjoy hands-on bike maintenance.

5. **Characteristic Feel and Performance**

The heavier steel cranks and bottom bracket contribute to a more "grounded" feel, which some riders find preferable for aggressive riding styles like street or park BMX. The lack of modern lightweight materials means the bike may feel more responsive to pedal input in certain contexts, though this is subjective and depends on riding style.

6. **Affordability (for Vintage Parts)**

Compared to modern high-end BMX cranks or bottom brackets, the BB-MX60 can be relatively inexpensive, especially if sourced from a used market or collector. This makes it accessible for riders on a budget who prioritize functionality over cutting-edge technology.

---

### **Cons**

1. **Weight**

The primary drawback of the BB-MX60 system is its weight. Steel cranks and a heavy bottom bracket add significant mass to the bike, which can make it harder to maneuver, especially in tricks or high-speed racing. Modern BMX cranks, often made from aluminum or carbon fiber, are significantly lighter without sacrificing strength, making the vintage setup feel sluggish by comparison.

2. **Maintenance Requirements**

While the simplicity of the BB-MX60 is a pro for some, it also means that the bearings are exposed to dirt, moisture, and debris, leading to faster wear. Regular cleaning, lubrication, and bearing replacement are necessary to prevent seizing or excessive play. This can be more time-consuming than maintaining a sealed bottom bracket system, which requires less frequent attention.

3. **Lack of Modern Features**

- **Sealed bearings**: Protect against dust and moisture, reducing maintenance.

- **Precision machining**: Modern cranks often have smoother surfaces and better tolerances for reduced friction.

- **Adjustable bottom brackets**: Some modern systems allow for easier crank height adjustments.

- **Lightweight materials**: Aluminum or composite cranks reduce overall bike weight.

These absences can make the vintage setup feel outdated in terms of performance and convenience.

4. **Limited Availability of Spare Parts**

While Shimano has continued to produce BMX-specific hardware, the BB-MX60 is no longer in active production. Finding replacement parts, such as specific crank bolts or bearings, can be challenging, especially if the original components wear out. This may require sourcing from vintage markets or third-party suppliers, which can be unreliable or costly.

5. **Compatibility Issues with Modern BMX**

- **Spindle size**: Some modern frames use 24mm or 26mm spindles, while the BB-MX60 typically uses a 22mm spindle.

- **Bottom bracket standards**: Modern frames may use a different shell width (e.g., 68mm or 73mm with different offset standards) or a different axle type (e.g., threaded vs. press-fit).

Adapters can sometimes bridge these gaps, but they may compromise performance or durability.

6. **Potential for Rust**

The steel components are prone to rust, particularly if the bike is stored in damp conditions or not cleaned regularly. Rust can weaken the crank arms or bottom bracket, leading to catastrophic failure if ignored. This requires diligent care to prevent.

7. **Performance Limitations**

The heavier weight and less efficient bearings can reduce pedal efficiency and acceleration, which may be noticeable in racing or high-performance riding. While this may not matter for casual or vintage-style riding, competitive riders will likely find modern cranks more suitable.

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### **Conclusion**

The Shimano BB-MX60 bottom bracket and cranks are a fascinating piece of BMX history with a dedicated following among collectors and riders who appreciate vintage mechanics. They offer durability, simplicity, and a connection to the sport s past, but their weight, maintenance demands, and lack of modern features make them less ideal for performance-oriented or contemporary BMX riding.

If your primary goal is to **ride a vintage BMX bike authentically** or to **collect and restore classic hardware**, the BB-MX60 is an excellent choice. However, if you re looking to **maximize performance, reduce maintenance, or ride a modern BMX bike**, investing in contemporary cranks and bottom brackets would be more practical.

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### **Recommendation**

- You re restoring or riding a vintage BMX bike from the 1980s or early 1990s.

- You re a collector or enthusiast who values historical components.

- You don t mind the extra weight and maintenance, and you enjoy the mechanical simplicity.

- You re on a tight budget and can source the parts reliably.

- You re riding a modern BMX bike and need compatibility with current standards.

- You prioritize lightweight performance, especially in racing or aggressive riding.

- You dislike frequent maintenance or don t have access to tools/knowledge for upkeep.

- You want sealed bearings, modern materials, or adjustable features.

For most **modern BMX riders**, especially those focused on racing or park riding, a contemporary crankset (e.g., Shimano s current BMX cranks, Sunrace, or other brands) paired with a sealed bottom bracket would be a far superior choice. However, if you re drawn to the nostalgia and rugged charm of the 1980s, the BB-MX60 remains a compelling option for the right rider.

Details:

Made in Japan. Still Very Good Condition. Good for Old School Show, BMX Racing, Or Enjoy Riding. Spindle: Cr-Mo 4130.

Not easy an Hard to find. Will fit: model # MX60, MX61, and MX62. Feel Smooth and Fast. Always promise I will carefully pack and full wrap it in the box.

Bearings are very good. Threads are very good. Stored for many years and taken good care of. 1980 1982-85 Shimano DX Bottom Bracket BB.

Vintage/Old School BMX. Few small scratches. I cleaned it up and inspected it: No cracks, bends, or dings/dents.

part #: bbmx60 prices

• $27.99-$395.00

specifications vintagebikepartiz:

• brand: Shimano
• mpn: Bb-mx60
• model: Shimano Dx Bb-mx60 Mx61 Mx62
• type: Bottom Bracket Crankset Cranks
• color: Silver
• for bike type: Bmx Bike Old School Cruiser
• country of origin: Japan
• vintage: Yes

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• options: Ship-to-home
• started: March 30, 2026
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• availability: In Stock
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