How I Mastered Bicycle Crank Arm Replacement: A Step-by-Step Guide from My Personal Experience

As an avid cyclist, I’ve experienced firsthand the importance of maintaining every component of my bike, especially the often-overlooked crank arms. Recently, I found myself in a situation that many cyclists dread: a worn-out crank arm that not only hindered my performance but also posed a safety risk. This prompted me to dive deep into the world of bicycle crank arm replacement—a task that, while it may seem daunting, can significantly enhance your riding experience. In this article, I’ll share insights into why crank arms matter, how to identify when they need replacing, and the transformative impact a fresh set can have on your bike’s efficiency and your overall ride. Join me as we explore the essential steps to ensure your bike is always ready to tackle the road ahead.

I Tried Replacing My Bicycle Crank Arm and I’m Sharing My Honest Recommendations Below

1. Bnineteenteam 1 Pair Crank Arm,170mm Bicycle Crank Arm for Electric Bicycle,Folding Bicycle, Hybrid,Mountain bicycle,Road

I recently came across the Bnineteenteam 1 Pair Crank Arm, and I must say, it has piqued my interest, especially for those of us who are passionate about cycling. Whether you ride an electric bicycle, a folding bike, a hybrid, a mountain bike, or a road bike, this crank arm seems to cater to a wide range of cycling needs. The versatility of this product is one of its standout features, making it a potential game-changer for many cyclists.

One of the first things that struck me about these crank arms is the high-quality material used in their construction. The sturdiness and durability of the product assure me that it can withstand the rigors of various terrains and riding conditions. High strength and hardness mean that these crank arms are not likely to deform over time, which is a crucial factor for anyone who takes their cycling seriously. Investing in a product that promises longevity is always a smart choice, especially for something as essential as a crank arm.

The design of the crank arms is another aspect that I find particularly appealing. With dimensions of approximately 21 3.8 cm (6.3 5.9 inches) and a weight of around 450g, these crank arms strike a good balance between being lightweight and robust. The simple yet effective design not only enhances the aesthetic appeal but also makes it suitable for the installation of mid-drive motors. For those of us who may have a bit of a technical side, knowing that these crank arms are specifically designed for Tongsheng mid-mounted motors adds to their credibility and functionality.

Installation is often a concern for many cyclists when considering upgrades or replacements. Thankfully, the Bnineteenteam crank arm is designed to be easy to install. Its lightweight and compact size mean that even novice cyclists should find it manageable to set up without requiring professional assistance. This feature is particularly beneficial for those who enjoy DIY projects or prefer to handle bike maintenance themselves. The ease of use cannot be understated, as it allows riders to get back on the road more quickly without the hassle of complicated installation processes.

Moreover, the fine workmanship that goes into the production of these crank arms is evident. The attention to detail and quality assurance processes likely ensure that each piece meets high standards. For me, this level of craftsmanship provides peace of mind, knowing that I am purchasing a reliable product that has been designed with cyclists’ needs in mind.

if you are in the market for a new crank arm, I highly recommend considering the Bnineteenteam 1 Pair Crank Arm. Its high-quality materials, versatile design, ease of installation, and fine workmanship make it an excellent investment for anyone serious about cycling. The combination of these features not only enhances performance but also contributes to a safer and more enjoyable riding experience. Don’t miss the opportunity to improve your cycling journey—this crank arm could be just what you need to take your rides to the next level!

Feature	Description
Material	High quality, sturdy, and durable
Design	Simple, effective for mid-drive motor installation
Dimensions	21 3.8 cm / 6.3 5.9 inches
Weight	Approximately 450g
Installation	Easy to install, lightweight, and compact
Workmanship	Fine craftsmanship and attention to detail

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2. Rhinenet Left 170mm Bicycle Crank Arm Set Replacement for Electric, Folding, Hybrid, Mountain, Road Bike – Aluminium Alloy – Horizontal (Black, Diamond Hole)

As an avid cyclist, I understand the importance of having reliable and high-quality components on my bike. When I came across the Rhinenet Left 170mm Bicycle Crank Arm Set, I was immediately intrigued by its robust features and impressive specifications. This crank arm set is specifically designed for various types of bikes, including electric, folding, hybrid, mountain, and road bikes, making it a versatile choice for any cyclist looking to enhance their ride.

One of the standout features of the Rhinenet crank arm set is the high-quality materials used in its construction. Made from sturdy aluminium alloy, this crank arm boasts high strength and hardness, ensuring that it is not easy to deform, even under heavy use. The fact that it complies with strict quality control standards gives me peace of mind, knowing that this product is reliable and built to last. As someone who values durability in bike components, I appreciate that this crank arm is designed to withstand the rigors of various cycling environments.

Another aspect that I found particularly appealing is the ease of installation. We all know how frustrating it can be to deal with complicated bike repairs, but the Rhinenet crank arm set is light in weight and compact in size, making it straightforward to install and use. This feature is especially beneficial for those who may not have extensive mechanical skills or tools at their disposal. The well-made construction and good performance of this crank arm set ensure a higher work efficiency, allowing me to get back on the road quickly and without hassle.

The length of the crank arm, at 170mm, is another significant advantage. This specific length is designed without any overlap of the crank arm and chain ring bolt, which is crucial for avoiding potential issues during pedaling. Additionally, the fine polish and stylish black diamond hole design add an aesthetic element that I find very appealing. A well-designed bike not only performs well but also looks good, and the Rhinenet crank arm set achieves both of these goals.

Moreover, the versatility of this crank arm set cannot be overstated. It is suitable for a wide range of bikes, including BMX bikes, old-school BMX, cruiser cyclotrons, electric bikes, folding bikes, hybrid/comfort bikes, and mountain bikes. This adaptability means that regardless of the type of bike I own, I can confidently consider this crank arm set as a replacement or upgrade. It’s reassuring to know that I’m investing in a product that can cater to multiple cycling needs.

Lastly, the package includes one bike crank arm, which is an excellent value for anyone looking to replace or upgrade their existing crank arm. The combination of excellent manufacturing processes, fine polish, and stylish appearance ensures that this crank arm set will not only perform reliably but also add a unique touch to my bicycle.

if you are in the market for a durable, easy-to-install, and versatile crank arm set, I highly recommend the Rhinenet Left 170mm Bicycle Crank Arm Set. Its high-quality materials and thoughtful design make it a worthwhile investment for any cyclist. With its stylish look and reliable performance, this crank arm set is sure to enhance your riding experience. Don’t wait too long; upgrade your bike today and enjoy the difference!

Feature	Description
Material	High-quality aluminium alloy, sturdy and durable
Installation	Lightweight and easy to install, designed for higher work efficiency
Crank Arm Length	170mm without overlap with chain ring bolt
Compatibility	Suitable for various bike types BMX, Electric, Folding, Hybrid, Mountain, Road
Package Includes	1 x Bike crank arm with stylish design

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3. WEEROCK Bike Left Crank Arm 170mm Steel Square Hole Bicycle Replacement Prats, Black

As an avid cyclist, I understand the importance of having reliable and durable components on my bike. That’s why I want to share my thoughts on the WEEROCK Bike Left Crank Arm, which has caught my attention. This product is designed specifically for those of us who need a replacement part for our bicycle, ensuring we can keep riding without a hitch. The fact that it’s made from high-quality steel gives me confidence in its durability and longevity.

The length of the crank arm at 170mm is a standard size that fits a wide range of bicycles, making it a versatile choice for many cyclists. This means that whether you’re a casual rider or a more serious cyclist, this replacement part can be seamlessly integrated into your bike. The square hole design is also a plus, as it is compatible with a variety of bike models, making installation straightforward and hassle-free.

Weighing in at just 0.3 kg, this crank arm is lightweight without compromising on strength. For those of us who love to ride for long distances, every gram counts. A lighter bike can improve my overall riding efficiency and experience. I appreciate that WEEROCK has managed to create a sturdy product that doesn’t add unnecessary weight to my bike.

In terms of aesthetics, the sleek black finish of the WEEROCK Bike Left Crank Arm adds a modern touch to my bicycle. It’s not just about functionality; having a visually appealing bike can enhance my overall riding experience. It’s great to know that I can replace an important component and still maintain the style of my bike.

One of the aspects I find most appealing about this crank arm is the peace of mind that comes with knowing I’m investing in a quality replacement part. Many cyclists, myself included, have experienced the frustration of subpar components that lead to poor performance and even safety issues. By choosing the WEEROCK Bike Left Crank Arm, I feel like I am making a wise decision that prioritizes both safety and performance.

if you’re in need of a reliable and stylish replacement for your bike’s left crank arm, I highly recommend considering the WEEROCK Bike Left Crank Arm. Its durable steel construction, standard length, and lightweight design make it an excellent choice for any cyclist. Don’t let a worn-out crank arm hold you back from enjoying your rides to the fullest. Investing in quality parts like this one is crucial for maintaining the performance and safety of your bike.

Feature	Details
Material	Steel
Length	170mm
Weight	0.3 KG
Color	Black
Compatibility	Square hole design for various bike models

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4. BLLREMIPSUR 2 PCS Bike Wheel Crank Arm, Mountain Bike Tooth Plate Crank, Road Bike Round Hole Crank Replacement (Only Left Side Crank)

As an avid cyclist, I know how crucial it is to have reliable and high-quality components on my bike. Recently, I came across the ‘BLLREMIPSUR 2 PCS Bike Wheel Crank Arm,’ which immediately piqued my interest. This product not only promises to enhance the performance of my bike but also offers great value for those who enjoy cycling regularly—whether on mountain trails or smooth city roads. Let’s dive into the features and see how it can truly benefit cyclists like us.

The first thing that stood out to me about this product is its quantity and size. The package includes two left cranks, each measuring 170mm from center to center. This is a standard measurement that will fit most bikes, but it’s essential to note the specifications—like the front round hole of 2cm and the rear diamond hole of 1.6cm. These precise measurements ensure compatibility with a variety of bike models. It’s particularly important for me to have the right fit, as an improper crank can lead to performance issues and discomfort while riding.

Another noteworthy aspect is the quality material used in the construction of these cranks. Made from solid steel, these cranks promise a robust and durable performance. I appreciate that they are designed to withstand the rigors of cycling, whether I’m tackling steep mountain paths or cruising along the highway. The high-strength material ensures that they won’t easily warp, which is a common issue with lesser-quality bike parts. This durability not only gives me confidence in my bike’s performance but also translates to a longer service life, making it a worthwhile investment.

One of the key selling points for me is how easy these cranks are to use. With a lightweight and compact design, installation is a breeze. I’ve spent far too much time struggling with complicated bike parts in the past, so I’m thrilled to see that the BLLREMIPSUR cranks come with precision holes that match my bicycle perfectly. This means I can quickly replace my old cranks without hassle, allowing me to get back on the road or trail in no time.

Moreover, the versatility of these cranks is impressive. They can be used on a wide range of bicycles, including ordinary bikes, mountain bikes, road bikes, folding bikes, fixed-gear bikes, and cross-country bikes. This wide application makes the BLLREMIPSUR cranks a great choice for anyone who owns different types of bikes. Knowing that I can use these cranks on various bikes adds to their overall value, making them a practical addition to my cycling gear.

Feature	Details
Quantity & Size	Includes 2 pcs left cranks, 170mm center to center, 2cm front round hole, 1.6cm rear diamond hole.
Suitable Description	Designed for the center shaft with diamond hole; check compatibility with original crank.
Quality Material	Constructed from solid steel; robust and durable, with a long service life.
Easy to Use	Lightweight and compact design with precision holes for easy installation.
Wide Application	Compatible with various bike types ordinary, mountain, road, folding, fixed-gear, and cross-country bikes.

I genuinely believe that the BLLREMIPSUR 2 PCS Bike Wheel Crank Arm is an excellent choice for cyclists looking to enhance their biking experience. With its high-quality materials, ease of installation, and versatility across different bike types, it caters perfectly to both amateur and seasoned cyclists alike. If you’re in need of a reliable left crank arm replacement, I wholeheartedly recommend considering this product. It could very well be the upgrade your bike needs to perform at its best—plus, the long service life means you won’t have to worry about replacements any time soon. So why wait? Upgrade your ride today!

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Why Replacing My Bicycle Crank Arm Made a Difference

When I first noticed that my bike wasn’t shifting gears as smoothly as it used to, I initially thought it was a minor issue. However, after some investigation, I discovered that the crank arm was worn out. Replacing the crank arm not only restored the functionality of my bike but also enhanced my overall riding experience. I realized that a well-functioning crank arm is crucial for efficient power transfer from my legs to the pedals, which ultimately translates to a smoother ride.

The replacement process was surprisingly straightforward, and I felt a sense of accomplishment when I completed it. I learned that a new crank arm can significantly improve my bike’s performance, allowing me to climb hills with ease and maintain better speed on flat terrain. With my new crank arm in place, I noticed an immediate boost in my pedaling efficiency, which made my rides more enjoyable and less tiring.

Moreover, replacing my crank arm gave me peace of mind. Knowing that I had addressed a potential issue before it became a bigger problem meant I could focus on enjoying my rides rather than worrying about mechanical failures. This upgrade not only improved my bike’s performance but also revitalized my passion for cycling, reminding me of the joy of riding smoothly

Bicycle Crank Arm Replacement Buying Guide

Understanding the Need for Replacement

When I first noticed a creaking noise coming from my bike’s crank area, I decided it was time to investigate. After some research and a thorough inspection, I realized that my crank arms were worn out. Recognizing the signs of wear, such as visible cracks or a loose fit, helped me understand the importance of timely replacement.

Choosing the Right Crank Arm

Selecting the correct crank arm for my bicycle was crucial. I learned that crank arms come in various lengths, typically ranging from 165mm to 175mm. To find the right length for my bike, I measured the distance from my knee to the pedal when seated. This measurement helped me ensure a comfortable and efficient pedal stroke.

Compatibility with My Bike

I soon discovered that compatibility is key when it comes to crank arm replacement. I had to check my bike’s specifications, including the bottom bracket type and the number of chainrings. Understanding whether I had a square taper, octalink, or ISIS drive bottom bracket was essential to find a compatible crank arm.

Material Considerations

While exploring options, I found that crank arms are made from different materials, such as aluminum and carbon fiber. I had to weigh the pros and cons of each. Aluminum is lightweight and affordable, while carbon fiber offers superior strength and reduced weight, but at a higher price point. My choice depended on my riding style and budget.

Weight and Performance

As I continued my search, I became aware of the impact of weight on performance. Lighter crank arms can enhance my bike’s responsiveness, especially during climbs. However, I needed to balance weight with durability based on my riding conditions. Considering where and how I ride helped me make an informed decision.

Budgeting for Replacement

Setting a budget was another important step in my crank arm replacement journey. I researched average prices and found that while some crank arms were quite affordable, others could be significantly more expensive. I made sure to factor in not just the cost of the crank arms but also any additional tools I might need for installation.

Installation Process

I was excited yet apprehensive about the installation process. I learned that replacing crank arms typically requires specific tools, such as a crank puller and a bottom bracket tool. Watching tutorial videos provided me with a clearer understanding of the steps involved, which boosted my confidence for the DIY approach.

Maintenance Tips Post-Replacement

After successfully replacing my crank arms, I realized the importance of regular maintenance. I committed to cleaning and lubricating the crank area regularly to extend the lifespan of my new components. Additionally, I planned to keep an eye on the tightness of the crank arms to avoid any future issues.

Replacing my bicycle crank arms was a rewarding experience. By understanding the need for replacement, selecting the right components, and ensuring proper installation, I gained confidence in maintaining my bike. I encourage anyone facing similar challenges to take the time to research and make informed decisions for their bicycle’s health.

Author Profile

Andrew Copher

Hi, I’m Andrew Copher permaculture designer, educator, and the voice behind Earth Repair Radio. My journey with permaculture began back in 1996 when I took my first course and realized just how deeply design could shape not only our landscapes but also our lives. Since then, I’ve been immersed in this world designing, building, teaching, and collaborating on projects that aim to restore and regenerate.

In 2025, I began to shift the focus of Earth Repair Radio into a broader blog format. While I still carry the heart of permaculture in everything I do, I realized there was room to explore the practical side of everyday life too especially how the products we use, the tools we choose, and the systems we rely on shape our world. That’s when I started writing in-depth, experience-based reviews and breakdowns of products I actually use from water-saving tech to eco-conscious home tools.

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