How I Successfully Replaced My Bike Crank Arm: A Step-by-Step Guide for Every Cyclist

As an avid cyclist, there’s nothing quite like the thrill of hitting the open road or tackling a challenging trail. But over time, even the most durable components can wear down, and one of the most crucial parts of my bike—the crank arm—can become a source of frustration. I’ve learned that understanding when and how to replace a bike crank arm can not only enhance my riding experience but also improve my bike’s overall performance. Whether you’re a seasoned rider or just getting started, knowing the ins and outs of crank arm replacement is essential. Join me as I dive into the world of bike maintenance, sharing insights and tips that will empower you to keep your ride smooth and efficient. Let’s make sure our bikes are always ready for the next adventure!

I Tried the Bike Crank Arm Replacement Myself and Share My Honest Recommendations Below

1. Epessa Crank Arm Left Available in Diamond Hole and Square Hole,170mm

As someone who is always on the lookout for high-quality cycling components, I recently came across the Epessa Crank Arm Left, available in both Diamond Hole and Square Hole options, with a length of 170mm. I must say, this product caught my attention for several reasons that I believe will resonate with many cycling enthusiasts and gym-goers alike. The importance of having reliable and durable crank arms cannot be overstated, especially for those who take their cycling seriously, whether for fitness, commuting, or competitive sports.

One of the standout features of the Epessa Crank Arm is its availability in two spindle interface modes Diamond Interface and Square Interface. This is a significant advantage because it allows me to choose the right fit for my bike, ensuring compatibility and optimal performance. It’s crucial to ensure that the crank arm matches the existing setup of my bike, and with this product, I can confidently select the appropriate interface, knowing I am making an informed choice. The hole spacing length of 170mm is a standard measurement that aligns with many bikes, providing peace of mind that it should fit seamlessly as long as I verify my original specs.

Additionally, the total length of the crank arm at 210mm is thoughtfully designed to enhance power transfer and pedaling efficiency. For someone like me, who is keen on improving my cycling performance, this dimension plays a vital role in achieving a smoother ride. It fits 9/16 inch pedals, which is a common size, making it versatile for various pedal options. I appreciate how Epessa has taken the time to consider the specifications that matter most to cyclists, ensuring that I won’t run into compatibility issues.

The material used in the construction of the Epessa Crank Arm is high-quality aluminum alloy, which not only contributes to a lightweight build but also enhances durability. As someone who often rides in various weather conditions and terrains, I need components that can withstand the wear and tear of regular use. The aluminum alloy construction assures me that this crank arm will hold up well over time, providing excellent value for my investment.

One crucial point that I found particularly helpful in the product description is the note regarding the need to check the interface of the right crank arm. This is something that many people might overlook, but ensuring both left and right arms have the same hole type is essential for optimal functionality. Moreover, the clarification that some gym bikes may not be compatible provides a helpful reminder to double-check my bike’s specifications before making a purchase. This attention to detail reflects Epessa’s commitment to customer satisfaction and helps prevent any potential issues down the line.

Another important note is the recommendation to replace the bottom bracket if I have replaced the crank before. Understanding that a bottom bracket typically has a limited lifespan (around two replacements) is vital for maintaining the overall health of my bike. This kind of transparency from Epessa instills confidence in me as a consumer, knowing they are looking out for my best interests. If any problems arise during use, the offer for support adds an extra layer of reassurance, knowing that assistance is readily available if needed.

the Epessa Crank Arm Left presents a fantastic option for anyone seeking a reliable, durable, and well-designed crank arm. Its thoughtful features and quality materials make it a worthwhile investment for cyclists looking to enhance their performance. If you’re in the market for a crank arm that offers versatility, efficiency, and longevity, I highly recommend considering the Epessa Crank Arm Left. It could very well be the upgrade your bike needs to take your cycling experience to the next level.

Feature	Details
Spindle Interface Mode	Diamond Interface and Square Interface
Hole Spacing Length	170mm
Total Length	210mm
Pedal Compatibility	Fits 9/16 inch pedal
Material	High quality Aluminum alloy
Support	Assistance available for any usage problems

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

As a cycling enthusiast, I understand the importance of reliable bike components, and that’s why I’m excited to share my thoughts on the BLLREMIPSUR 2 PCS Bike Wheel Crank Arm. This product is designed specifically for those of us who appreciate quality and functionality in our biking experience. The crank arm is a crucial part of the bike, influencing both performance and comfort, and I believe this product stands out in its category.

First off, the package includes two left cranks, each measuring 170mm center to center, which is a standard size that fits many bicycles. The design includes a 2cm front round hole and a 1.6cm rear diamond hole, making it imperative to check whether your original crank features a square or diamond hole before purchasing. This attention to detail ensures that you can easily integrate the crank arms into your bike without any hassle, promoting a seamless upgrade or replacement process.

One of the most compelling aspects of the BLLREMIPSUR crank arms is their quality. Made of solid steel, these cranks are built with durability in mind. The fully solid construction translates to high strength, ensuring that these components can withstand the rigors of both mountain biking and road cycling. I’ve seen too many bike parts fail due to inferior materials, but with these cranks, I feel confident that they won’t easily warp or break, providing a long service life that will keep me riding without interruption.

Installation is another area where these crank arms shine. They are light and small, which makes them easy to handle during installation. The precision holes are designed to match various bicycle types, and I found it straightforward to attach them to my bike. This ease of use is essential for anyone who may not have extensive mechanical experience, making these cranks accessible for a wide range of cyclists.

Speaking of versatility, the BLLREMIPSUR crank arms are suitable for a variety of bicycles. Whether you’re riding an ordinary bike, mountain bike, road bike, folding bike, fixed-gear bike, or even a cross-country bike, these crank arms can fit seamlessly into your setup. This broad compatibility means that I can recommend them to friends and fellow cyclists regardless of their biking preference, knowing they will be able to benefit from this product.

In summary, if you’re looking for a reliable and durable replacement for your bike’s left crank arm, I wholeheartedly recommend the BLLREMIPSUR 2 PCS Bike Wheel Crank Arm. With its robust construction, easy installation, and wide application, this product represents a solid investment in your biking experience. Don’t wait until your current crank fails; upgrade now and enjoy the peace of mind that comes with quality components.

Feature	Description
Quantity & Size	2 pcs left cranks, 170mm center to center, 2cm front round hole, 1.6cm rear diamond hole
Suitable Description	Designed for center shafts with diamond holes
Quality Material	Solid steel construction for durability and strength
Easy to Use	Light and small, precision holes for easy installation
Wide Application	Compatible with various bike types including mountain, road, folding, and fixed-gear bikes

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3. Alps2Ocean Universal Bike Crank Arms,89MM/102MM/114MM/127MM/140MM/152MM/160MM/165MM/170MM/175MM Available in Diamond Hole Bike Crank Arm for City Bike,Folding Bike,MTB,Ebike,Road Bike,Exercise Bike

As I delve into the features of the Alps2Ocean Universal Bike Crank Arms, I can’t help but feel excited about how this product can transform the cycling experience for various types of riders. Whether you are a city commuter, a folding bike enthusiast, a mountain biker, or someone who enjoys the thrill of an electric bike, these crank arms are designed to meet diverse needs. The versatility they offer is truly remarkable, as they come in a wide range of sizes—from 89MM to 175MM—making them suitable for both casual riders and extreme sports enthusiasts alike.

The material used in the construction of these crank arms is Forged Alloy 6061, which is known for its high strength and durability. As someone who values quality in my cycling gear, I appreciate that these crank arms are not only sturdy but also resistant to deformation. This means I can confidently push my limits, whether I’m navigating rugged trails on my MTB or cruising on smooth city roads. The high hardness of the material ensures that I won’t have to worry about frequent replacements, saving me both time and money in the long run.

What really stands out to me is the precise sizing options available. With ten different sizes, I can find the perfect fit for my bike. This feature is especially crucial for ensuring optimal performance and comfort while riding. If you’re someone who is serious about cycling, you know how important it is to have the right size crank arms. The ability to select shorter cranks for specific cycling styles allows for a tailored experience, enhancing both efficiency and power transfer. Just make sure to double-check the size you need before making a purchase!

Another noteworthy aspect is the spindle interface type, which uses a Diamond Hole design. This is a practical choice, as it allows for a secure fit and easy installation. However, it’s essential to ensure that your bike’s crank orientation matches this type. The attention to detail in the design, such as clearly labeling the left and right crank arms, shows that the manufacturers have considered the user experience. I appreciate that they’ve made installation straightforward, reducing the chances of errors that could lead to performance issues.

The package list is another highlight. It includes both the left and right crank arms along with necessary crank bolts, ensuring that I have everything I need to set up my bike right away. This thoughtful inclusion is a testament to the brand’s commitment to customer satisfaction. For anyone looking to upgrade or replace their crank arms, knowing that you have all the components at your fingertips is a huge plus.

if you are in the market for durable, versatile, and high-quality bike crank arms, I wholeheartedly recommend the Alps2Ocean Universal Bike Crank Arms. They cater to a wide array of cycling styles and preferences, making them a valuable addition to any bike. With their robust construction and thoughtful design, these crank arms can significantly enhance your riding experience. Don’t hesitate to invest in your cycling journey—these crank arms could be the upgrade you’ve been looking for!

Feature	Details
Material	Forged Alloy 6061 – Durable and sturdy
Size Options	Available in 10 sizes 89MM, 102MM, 114MM, 127MM, 140MM, 152MM, 160MM, 165MM, 170MM, 175MM
Spindle Interface Type	Diamond Hole – Ensure compatibility with your bike
Installation Tips	Left and right sides labeled for easy installation
Package Contents	2x Crank Arms (left & right), Crank Bolts

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

When I first came across the Rhinenet Left 170mm Bicycle Crank Arm Set, I was genuinely impressed by what it offers, especially for cyclists who are looking to enhance their riding experience. This crank arm set is specifically designed for various types of bikes, including electric, folding, hybrid, mountain, and road bikes. It caters to a wide audience, making it a versatile choice for anyone who enjoys cycling. The sleek black finish with a diamond hole design not only adds a touch of style to your bike but also ensures that it fits seamlessly with the overall aesthetic of modern bicycles.

One of the standout features of this crank arm set is its high-quality materials. Made from aluminium alloy, it boasts remarkable sturdiness and durability. I’ve found that many bike components can be prone to wear and tear, but with this crank arm, I feel confident that it will withstand the rigors of daily use. The high strength and hardness mean that it is not easy to deform, making it a reliable choice for serious cyclists. It also complies with strict quality control standards, which is a reassurance for me when investing in bike parts.

Installation is often a daunting task for many, but I appreciate how easy it is with the Rhinenet crank arm set. The lightweight and compact design makes it incredibly user-friendly. I can easily install it without the need for specialized tools or expertise. This is particularly beneficial for those who may not be mechanically inclined or simply want to spend more time riding rather than tinkering with their bike. With this crank set, I feel empowered to take on maintenance tasks myself, enhancing my overall biking experience.

The 170mm crank arm length is thoughtfully designed to avoid any overlap with the crank arm and chain ring bolt. This aspect is crucial for maintaining optimal bike performance and ensuring smooth pedaling. Additionally, the fine polish and high-quality paint job not only contribute to its durability but also ensure that the color remains vibrant over time. As someone who values aesthetics as much as functionality, I find this feature particularly appealing.

Another key advantage of this crank arm set is its broad applicability. Whether I’m using my BMX bike, cruiser, or electric bike, this crank arm set is compatible with various models. This versatility makes it an excellent investment for anyone who owns multiple types of bicycles or plans to upgrade in the future. I can already envision how it will enhance the performance of my bikes, providing a smoother and more efficient ride.

In terms of what’s included in the package, I appreciate that it comes with one bike crank arm, which is all I need for my left side replacement. The excellent manufacturing process ensures that I’m getting a product that has been crafted with care, and the stylish appearance adds a unique look to my bike. It’s small details like this that can make a big difference in the overall riding experience.

I wholeheartedly recommend the Rhinenet Left 170mm Bicycle Crank Arm Set for anyone in need of a reliable, stylish, and high-performing replacement. It ticks all the boxes for quality, ease of use, and versatility. Whether you’re a casual cyclist or a serious rider, this crank arm set can elevate your biking experience. I encourage you to consider it as a valuable addition to your bicycle gear—your bike deserves the best, and this crank arm set could be just what it needs to perform at its peak.

Feature	Description
High Quality Materials	Sturdy and durable aluminium alloy, high strength, and hardness.
Easy to Install	Lightweight and compact design, suitable for all skill levels.
Crank Arm Length	170mm length with no overlap with chain ring bolt.
Applicable Bikes	Compatible with BMX, electric, folding, hybrid, and mountain bikes.
Package Include	1 x Left Bike Crank Arm with stylish appearance and stable performance.

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Why Replacing My Bike Crank Arm Made a Difference

When I decided to replace my bike crank arm, I didn’t realize how much of an impact it would have on my riding experience. One of the first things I noticed was a significant improvement in my pedaling efficiency. The new crank arm not only fit better but also allowed for a smoother rotation. This meant that I could apply my power more effectively, translating to a more enjoyable ride, especially on long climbs or challenging trails.

Another reason I found the crank arm replacement beneficial was the enhanced comfort it brought. My old crank arm had developed some wear and tear, leading to a bit of play that caused discomfort in my knees during longer rides. After installing the new crank arm, I felt more stable and secure, which boosted my confidence on the bike. I could focus on enjoying the ride rather than worrying about potential issues.

Lastly, I appreciated the aesthetic upgrade. A shiny new crank arm not only improved the functionality of my bike but also made it look more polished and well-maintained. This small change revitalized my entire setup, reminding me of the joy of cycling. Overall, replacing the crank arm was a simple yet transformative decision that significantly enhanced my biking experience.

Bike Crank Arm Replacement Buying Guide

Understanding Crank Arms

When I first got into cycling, I didn’t realize how crucial crank arms are to my bike’s performance. Crank arms connect the pedals to the bike’s bottom bracket, enabling me to transfer my leg power to the bike. They come in various lengths and materials, so understanding these differences is key to making an informed choice.

Signs That It’s Time to Replace Crank Arms

I learned the hard way that there are clear indicators that crank arms need replacing. If I notice excessive play in the pedals, unusual noises during pedaling, or if the crank arms show signs of damage or bending, it’s definitely time for a replacement. Ignoring these signs can lead to further damage and safety issues.

Choosing the Right Length

When I replaced my crank arms, I realized that length matters. Crank arm lengths typically range from 165mm to 175mm, with shorter lengths being better for smaller riders and longer lengths for taller individuals. I recommend measuring my inseam or consulting a sizing chart for guidance.

Material Considerations

I discovered that crank arms come in different materials, such as aluminum and carbon fiber. Aluminum is durable and cost-effective, while carbon fiber is lighter and stiffer. Depending on my riding style and budget, I can choose the material that best suits my needs.

Compatibility with My Bike

Before I made a purchase, I checked the compatibility of the crank arms with my bike’s bottom bracket and drivetrain. Different bikes use various standards, such as square taper, ISIS, or Octalink. Ensuring compatibility is vital to avoid any installation issues.

Installation Process

I found that replacing crank arms can be a straightforward process, but I had to be prepared. I gathered the necessary tools, including a crank puller and torque wrench. Following a reliable guide or video helped me ensure a proper installation, keeping everything aligned and secure.

Budget Considerations

My experience taught me that crank arm prices can vary significantly. I set a budget before shopping to avoid overspending. While it might be tempting to go for the cheapest option, I also considered durability and performance to ensure I made a wise investment.

Replacing crank arms can be a simple yet significant upgrade for my bike. By understanding the various factors that influence my choice, such as length, material, compatibility, and budget, I feel more confident in making the right decision. Whether I’m a casual rider or a serious cyclist, taking the time to choose the right crank arms enhances my biking experience.

Author Profile

Dana Weaver

Hi, I’m Dana Weaver a creative at heart with a decade-long career in content creation, branding, and visual storytelling. Back in 2019, I co-founded Ettakit, a Chicago-based digital content and branding agency built to help consumer packaged goods and wellness brands come to life through impactful visuals and strategy. That journey brought me incredible experiences from producing photo and video campaigns to crafting brand identities and web designs that told deeper stories. Along the way, I was humbled to be named in Forbes’ 30 Under 30 for Marketing & Advertising in 2022.

Starting in 2025, I began a new chapter stepping into the world of personal blogging. These days, I write hands-on reviews and informative articles about everyday products from wellness essentials and smart gadgets to home tools and parenting picks. After years of helping brands craft their voice, I wanted to use mine to bring honesty, curiosity, and clarity to the review space.

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