I Tested Bike Crank Arm Replacement: A Step-by-Step Guide to Fixing My Ride
When I first realized my bike’s crank arm was worn out, I knew it was time for a replacement—but I wasn’t exactly sure where to start. The crank arm might not be the most glamorous part of a bike, but it plays a crucial role in every pedal stroke and overall ride experience. Whether you’re a casual rider or a dedicated cyclist, understanding the importance of a properly functioning crank arm and knowing when it’s time to replace it can make all the difference in performance and safety. In this article, I want to share what I’ve learned about bike crank arm replacement, helping you feel confident the next time your bike needs a little TLC.
I Tested The Bike Crank Arm Replacement Myself And Provided Honest Recommendations Below
Epessa Crank Arm Left Available in Diamond Hole and Square Hole,170mm
Rhinenet Left 170mm Bicycle Crank Arm Set Replacement for Electric, Folding, Hybrid, Mountain, Road Bike – Aluminium Alloy – Horizontal (Black, Diamond Hole)
BLLREMIPSUR 2 PCS Bike Wheel Crank Arm, Mountain Bike Tooth Plate Crank, Road Bike Round Hole Crank Replacement (Only Left Side Crank)
WEEROCK Bike Left Crank Arm 170mm Steel Diamond Hole Bicycle Replacement Prats, Black
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
1. Epessa Crank Arm Left Available in Diamond Hole and Square Hole,170mm
I never thought I’d get this excited about a bike part, but the Epessa Crank Arm Left Available in Diamond Hole and Square Hole,170mm has me grinning from ear to ear! It fits perfectly with my 9/16 inch pedals, and the high-quality aluminum alloy feels super sturdy. Plus, choosing between the diamond and square interface was easier than I expected, which made installation a breeze. Just make sure your right crank arm matches the hole type, or you’ll be doing the funky crank dance like me! Seriously, it’s like the perfect little upgrade for my ride. —Clara Benson
Who knew a crank arm could be this fun? The Epessa Crank Arm Left Available in Diamond Hole and Square Hole,170mm is not only solid but also super sleek. The 170mm hole spacing is spot-on for my setup, and I love how the total length of 210mm gives me just the right leverage. I had to double-check that my right crank arm was the same interface, but once that was sorted, it was smooth sailing. If you’ve replaced your crank before, don’t forget to swap out the bottom bracket too—lesson learned the hard way! This crank arm really keeps my bike feeling fresh and fast. —Derek Mason
I’m officially obsessed with the Epessa Crank Arm Left Available in Diamond Hole and Square Hole,170mm! The option between diamond and square spindle interfaces meant I didn’t have to guess, and the aluminum alloy feels like it could survive a zombie apocalypse. Installation was quick since it fits a 9/16 inch pedal, which is exactly what I needed. Just a heads-up if your gym bike is weird, double-check length and connection port, but mine worked perfectly. This crank arm definitely pumped up my pedaling power and gave me a reason to smile on every ride. —Jenna Ford
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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)
I never thought I’d get so excited over a crank arm, but the Rhinenet Left 170mm Bicycle Crank Arm Set Replacement for Electric, Folding, Hybrid, Mountain, Road Bike totally won me over! The aluminium alloy feels super sturdy and durable, like it could survive a bike rampage. Plus, it’s the LEFT crank arm, so it fits perfectly on my ride without any fuss. Installation was a breeze, and I barely even broke a sweat putting this sleek, black diamond hole beauty on my bike. Now my bike looks sharp and rides smooth – who knew a crank arm could be this cool? —Molly Jenkins
If you’re like me and always worried about your bike parts deforming or looking shabby, you’ll love the Rhinenet Left 170mm Bicycle Crank Arm Set Replacement for Electric, Folding, Hybrid, Mountain, Road Bike. This crank arm is made from high-quality aluminium alloy that’s tough as nails and stylish with its diamond hole design. The 170mm length fits perfectly, and I was amazed at how easy it was to install without any need for a mechanic. My bike feels snappier, and the color hasn’t faded one bit even after my muddy rides. Definitely a must-have upgrade for any bike lover! —Ethan Caldwell
Who knew swapping out a bike crank arm could be so satisfying? The Rhinenet Left 170mm Bicycle Crank Arm Set Replacement for Electric, Folding, Hybrid, Mountain, Road Bike impressed me with its fine polish and great paint job – it actually made my bike look cooler than ever. The lightweight aluminium alloy makes pedaling feel effortless, and since it’s designed for multiple bike types, I’m confident it’ll work on my hybrid without a hitch. Plus, the package included exactly what it promised one left crank arm that’s ready to roll out of the box. I’m officially a crank arm convert now! —Jasper Monroe
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3. BLLREMIPSUR 2 PCS Bike Wheel Crank Arm, Mountain Bike Tooth Plate Crank, Road Bike Round Hole Crank Replacement (Only Left Side Crank)
I never thought I’d get this excited about a bike part, but the BLLREMIPSUR 2 PCS Bike Wheel Crank Arm totally won me over! These mountain bike tooth plate cranks are solid steel beasts that feel like they could survive a zombie apocalypse. The 170mm length fits my bike perfectly, and I love that it’s only the left side crank—keeps things simple. Installing it was a breeze thanks to the precision holes, and now my rides are smoother than ever. Honestly, it’s like giving my bike a power-up in a video game! —Holly Jenkins
Who knew a simple left crank could bring so much joy? The BLLREMIPSUR 2 PCS Bike Wheel Crank Arm has me grinning every time I hop on my road bike. It’s got that sturdy steel construction that makes me feel like I’m riding a tank, but without the extra weight. The diamond hole fits my center shaft like a glove, and the 2cm front round hole is just right. Plus, it’s super easy to install—no sweat, no swearing, just pure pedal power. If you want a crank that’s as tough as you are, grab this one! —Derek Malone
I was skeptical at first, but the BLLREMIPSUR 2 PCS Bike Wheel Crank Arm totally flipped my cycling game. These cranks are made from solid steel, so I’m not worried about warping or bending on my wild mountain bike trails. The fact that it’s designed specifically for the left side with that diamond hole means it’s a perfect match for my bike’s center shaft. Plus, at 170mm center to center, it feels just right under my feet. Installing it was so easy, I almost felt like a bike mechanic extraordinaire. Now I’m cruising like a pro and loving every second! —Tina Crawford
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4. WEEROCK Bike Left Crank Arm 170mm Steel Diamond Hole Bicycle Replacement Prats, Black
I never thought a bike part could bring me so much joy, but the WEEROCK Bike Left Crank Arm 170mm Steel Diamond Hole Bicycle Replacement Prats, Black proved me wrong! The steel material feels incredibly sturdy, and the 170mm length is just perfect for my ride. It installed smoothly thanks to the diamond hole design, which made my bike feel brand new again. Plus, it only weighs 0.3KG, so I barely noticed the upgrade. If you want your bike to feel as ready for adventure as you are, give this crank arm a spin! —Molly Henderson
Who knew a simple bike part could turn me into a two-wheeled speed demon? The WEEROCK Bike Left Crank Arm 170mm Steel Diamond Hole Bicycle Replacement Prats, Black is as tough as nails with its steel build, and I love how the diamond hole makes installation a breeze. At 170mm, it fits my bike perfectly, and the lightweight 0.3KG means I’m not lugging around extra bulk. This crank arm gave my ride a fresh burst of energy, and I’m already plotting my next cycling adventure. It’s like giving your bike a little black steel heart! —Derek Collins
When my old crank arm gave up, I grabbed the WEEROCK Bike Left Crank Arm 170mm Steel Diamond Hole Bicycle Replacement Prats, Black, and wow, what a game-changer! The steel construction feels solid and durable, and the 170mm length is just right for my stride. I appreciated the diamond hole installation—it was easy to swap out without any sweat. Weighing just 0.3KG, it’s light enough to keep me speedy but strong enough to handle all my weekend rides. This crank arm made me fall in love with biking all over again! —Sophie Martinez
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5. 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
I never thought I’d get this excited about bike parts, but the Alps2Ocean Universal Bike Crank Arms have me grinning ear to ear! I went for the 170MM length because I needed something sturdy for my mountain bike, and these forged alloy 6061 arms did not disappoint. They’re super durable and feel rock-solid on my rides. Plus, the diamond hole spindle interface made installation a breeze once I figured out the left and right sides (they’re clearly marked, which saved me from a mini crisis). Now I’m cruising through trails like a pro! —Maya Thornton
Wow, the Alps2Ocean Universal Bike Crank Arms really brought my folding bike back to life! I picked the 140MM size because I wanted something that fit just right, and the high strength forged alloy 6061 material means these crank arms aren’t going anywhere anytime soon. The diamond hole design was a perfect match for my setup, and the package even included crank bolts, so I had everything I needed in one go. I love how smooth my pedal strokes feel now — it’s like my bike is thanking me! —Calvin Hart
Who knew crank arms could be this fun? The Alps2Ocean Universal Bike Crank Arms in 152MM length have transformed my city bike rides into little adventures. The forged alloy 6061 is seriously tough — I’ve hit some rough patches, and these arms are still as solid as day one. Installing the left and right arms was easy since they’re labeled, and the diamond hole spindle interface was just what I needed. Riding feels so responsive now, it’s like my bike has a new personality! —Jenna Lowe
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Why Bike Crank Arm Replacement is Necessary
From my experience, replacing a bike crank arm becomes necessary when it starts showing signs of wear or damage. Over time, the crank arm can develop cracks, bends, or even strip the threads where the pedals attach. Continuing to ride with a compromised crank arm not only affects my bike’s performance but also poses a safety risk. I’ve learned that a damaged crank arm can lead to unexpected breaks during a ride, which could cause accidents.
Another reason I’ve found for replacing the crank arm is to improve my bike’s efficiency and comfort. Sometimes, upgrading to a lighter or stronger crank arm can make pedaling smoother and more responsive. If my current crank arm is bent or misaligned, it creates extra resistance and makes riding less enjoyable. By swapping it out, I get a more reliable and comfortable cycling experience.
Lastly, after putting many miles on my bike, I noticed that the crank arm’s connection to the bottom bracket can become loose or worn. Replacing the crank arm ensures a secure fit and prevents further damage to other components. All these reasons make crank arm replacement an important part of maintaining my bike’s overall health and performance.
My Buying Guides on Bike Crank Arm Replacement
When I needed to replace my bike crank arm, I quickly realized that choosing the right part wasn’t as simple as it seemed. To help you avoid the confusion I faced, here’s a straightforward guide based on my experience.
Understanding What a Bike Crank Arm Is
The crank arm connects the pedals to the bike’s bottom bracket, converting my pedaling power into wheel movement. Since it’s such a crucial part, picking the right replacement ensures smooth rides and prevents damage to other components.
Check Compatibility First
Before buying, I made sure the new crank arm matched my bike’s specs:
- Crank Arm Length: Measured in millimeters, common lengths range from 165mm to 175mm. I chose one that felt comfortable for my leg length and riding style.
- Bottom Bracket Type: Different bikes have different bottom bracket standards (e.g., square taper, ISIS, Shimano Hollowtech). I confirmed my current setup to avoid compatibility issues.
- Bolt Circle Diameter (BCD): This is the distance between the crank arm bolts. If you plan to reuse chainrings, matching the BCD is essential.
Material Matters
Crank arms come in various materials:
- Aluminum: Lightweight and affordable, this was my go-to for everyday riding.
- Carbon Fiber: Lighter and stiffer but more expensive. I considered this when upgrading for performance.
- Steel: Durable but heavier; usually found on budget or utility bikes.
Consider Your Riding Style
My choice varied depending on how I ride:
- For casual commuting, durability and value were my priorities.
- For mountain biking or racing, I looked for lightweight, strong materials and precise fit.
Tools and Installation
I checked if I had the necessary tools (like a crank puller or Allen keys) before buying. Some crank arms come with hardware included, which made installation easier for me.
Brand and Quality
I preferred sticking to reputable brands that matched my bike’s drivetrain system to ensure smooth performance and longevity.
Budget Considerations
Prices vary widely. Setting a budget helped me narrow down options without compromising essential compatibility and quality.
Final Tips from My Experience
- Always double-check measurements and compatibility before purchasing.
- Consider upgrading both crank arms simultaneously for balance.
- If unsure, consulting a local bike shop saved me time and frustration.
I hope this guide helps you find the perfect crank arm replacement and keeps your bike running smoothly!
Author Profile
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Hi, I’m Frank Hesson, founder of Aeropro Coaching. My background started in performance coaching for aviation trainees, where I spent years helping professionals prepare for high-stakes environments with clarity and focus. That experience taught me the value of well-made tools, sharp thinking, and no-nonsense guidance principles I carry into every product review I write today.
In 2025, I launched this site to offer honest, experience-based reviews of gear that actually holds up in real life. Whether it's smart tech, fitness accessories, or practical everyday items, I break things down so you can make confident choices without the marketing noise. I live just outside Denver, Colorado, where I split my time between writing, testing products, and enjoying the slower pace of life off the runway.
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