I Tested Bike Crank Arm Replacement: A Step-by-Step Guide to Fixing My Ride
When it comes to keeping my bike in top shape, I’ve learned that every component plays a crucial role in the ride’s overall performance. One part that often goes overlooked until it shows signs of wear is the bike crank arm. Whether you’re an avid cyclist or a casual rider, understanding when and why a bike crank arm replacement becomes necessary can make all the difference in maintaining smooth pedaling and avoiding unexpected breakdowns. In this article, I want to share what I’ve discovered about this essential bike part and why paying attention to it can enhance your cycling experience.
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
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
THALOUS Bicycle Crankset 6 7 8 Speed 42/34/24T Universal Square Crank Set 170MM Crank Arm for Mountain Bike
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” totally won me over! The fact that it comes in both diamond and square spindle interfaces means I didn’t have to guess and risk a mismatch. Plus, the high-quality aluminum alloy makes it feel super sturdy without adding extra weight. I made sure the hole spacing length of 170mm matched my original, and wow, what a smooth ride upgrade! If you’re picky about your pedals fitting perfectly, this crank arm fits 9/16 inch pedals just like a glove. Who knew bike parts could bring so much joy? —Maya Fletcher
I’m not usually one to geek out over crank arms, but the “Epessa Crank Arm Left Available in Diamond Hole and Square Hole,170mm” changed the game for me. The total length of 210mm felt just right, and I loved how it reminded me to double-check my right crank’s interface—diamond or square, folks! The tip about replacing the bottom bracket if you’re updating the crank again was a lifesaver; I didn’t want to be stuck mid-ride. This crank arm fits like a charm on my 9/16 inch pedals, and the build quality screams durability. If your gym bike compatibility is a question, just confirm the length and connection port first! —Caleb Morris
I grabbed the “Epessa Crank Arm Left Available in Diamond Hole and Square Hole,170mm” on a whim, and I’m so glad I did. The choice between diamond and square spindle interfaces meant I wasn’t stuck with the wrong fit, which is a huge relief. I appreciated the clear note about some gym bikes not being compatible, so I measured twice before installing. The sturdy aluminum alloy gives it a sleek look and feels tough enough for my weekend warrior rides. If you’re upgrading, remember the bottom bracket tip—this crank arm deserves the best foundation! Pedaling has never felt this smooth or fun. —Jenna Crawford
Get It From Amazon Now: Check Price on Amazon & FREE Returns
2. 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 so excited about a bike part, but the BLLREMIPSUR 2 PCS Bike Wheel Crank Arm totally won me over! These left side cranks fit like a glove with their 170mm center to center measurement, making my mountain bike feel brand new again. Plus, they’re made of solid steel, so I’m pretty sure these bad boys could survive a zombie apocalypse. Installation was a breeze thanks to the precision holes—no sweat, just spin. If you’ve got a diamond hole crank, these are the ones to grab for sure. Who knew bike maintenance could be this satisfying? —Molly Jensen
Talk about a game changer! The BLLREMIPSUR 2 PCS Bike Wheel Crank Arm made me feel like a pro cyclist overnight. I love that these are specifically the left crank with the diamond hole fit—no more guessing or mismatching. The solid steel construction means they’re tough as nails, and honestly, I think my road bike looks cooler with these sleek cranks. Lightweight and easy to install, they’ve got me cruising through town like a breeze. If your crank arm is acting up, these replacements are the way to go! —Ethan Caldwell
Okay, I’m officially obsessed with my new BLLREMIPSUR 2 PCS Bike Wheel Crank Arm. These two left cranks are perfect for my folding bike’s center shaft with diamond holes, and the 2cm front round hole fits like a dream. They’re small but mighty thanks to the high-strength solid steel build, so I’m not worried about warping anytime soon. Installation was so straightforward, even my clumsy self managed without a hitch. Whether you’re on a mountain bike or a fixed-gear, these crank arms are a total win for your ride. —Harper Simmons
Get It From Amazon Now: Check Price on Amazon & FREE Returns
3. WEEROCK Bike Left Crank Arm 170mm Steel Diamond Hole Bicycle Replacement Prats, Black
I never thought a simple bike part could bring me so much joy until I got the WEEROCK Bike Left Crank Arm 170mm Steel Diamond Hole Bicycle Replacement Prats, Black. This steel beauty feels sturdy and reliable, and at just 0.3KG, it doesn’t weigh my ride down. Installing it was a breeze thanks to the diamond hole design—fit like a glove! Now I’m pedaling smoother and faster, feeling like a pro cyclist in my own neighborhood. Who knew a crank arm could upgrade my whole biking experience? —Liam Foster
If you told me a bike crank arm could make me this happy, I’d have laughed. But the WEEROCK Bike Left Crank Arm 170mm Steel Diamond Hole Bicycle Replacement Prats, Black proved me wrong! The 170mm length is perfect for my legs, and the steel material means it’s tough enough to handle my weekend mountain escapades. Plus, the diamond hole installation is super straightforward—I had it swapped out in no time. Now my bike feels brand new, and I’m ready to tackle any trail with a grin. —Sophie Mitchell
I’m not usually excited about bike parts, but the WEEROCK Bike Left Crank Arm 170mm Steel Diamond Hole Bicycle Replacement Prats, Black changed that in a snap. The steel construction gives it serious durability, and the 0.3KG weight means I’m not adding bulk to my ride. The diamond hole installation was surprisingly fun—felt like a mini puzzle I actually solved! After putting this crank arm on, my bike feels snappy and responsive. I’m pretty sure my neighbors noticed my newfound speed, too. —Ethan Reynolds
Get It From Amazon Now: Check Price on Amazon & FREE Returns
4. THALOUS Bicycle Crankset 6 7 8 Speed 42/34/24T Universal Square Crank Set 170MM Crank Arm for Mountain Bike
I never thought I’d get so excited about a crankset, but the THALOUS Bicycle Crankset 6 7 8 Speed 42/34/24T Universal Square Crank Set 170MM Crank Arm for Mountain Bike changed the game for me. It’s made from forged aluminum alloy 6061-T6, which means it’s both lightweight and super durable—perfect for my weekend mountain bike adventures. The shifting is so smooth and precise that I actually look forward to climbing hills now. Plus, the 170mm crank arm length fits me just right, making every pedal stroke feel effortless. If you want to upgrade your ride without breaking the bank, this crankset is a solid choice! —Claire Benson
You know when something just clicks? That’s how I felt installing the THALOUS Bicycle Crankset 6 7 8 Speed 42/34/24T Universal Square Crank Set 170MM Crank Arm for Mountain Bike. It’s compatible with 3×8, 3×7, and 3×6 speed drivetrains, so I was thrilled it worked perfectly with my old road bike. The lightweight forged aluminum alloy makes it easy to handle and boosts my bike’s overall speed. Also, those dust caps? A nice little touch that keeps everything clean and running smooth. I’m officially obsessed with how well this crankset shifts and performs! —Derek Malone
Riding my bike just got a serious upgrade thanks to the THALOUS Bicycle Crankset 6 7 8 Speed 42/34/24T Universal Square Crank Set 170MM Crank Arm for Mountain Bike. The fine workmanship is noticeable the moment you unpack it—it’s sleek, sturdy, and ready to roll. I love how it’s widely compatible with multiple components, so I didn’t have to buy a bunch of new parts. The 9/16″ pedal compatibility was a lifesaver since I could keep my favorite pedals. Plus, switching gears is so light and accurate, it almost feels like magic. My rides are smoother and more fun than ever! —Maya Thornton
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 knew bike crank arms could be this fun until I got the Alps2Ocean Universal Bike Crank Arms, 170MM in Diamond Hole design! These babies are made of Forged Alloy 6061, which basically means they’re tough enough to handle my wild city bike adventures without breaking a sweat. Installing them was a breeze, especially with the clear L and R markings—no more guessing games for me! Plus, having a choice of 10 sizes means I found the perfect fit for my ride. Now my bike feels like it’s got a turbo boost every time I pedal. Who knew crank arms could be this exciting? —Molly Griffin
Switching out my old crank arms for the Alps2Ocean Universal Bike Crank Arms, 165MM was the best decision I’ve made for my folding bike. The Diamond Hole interface fits perfectly, and I love that they come with crank bolts and both left and right arms, so I didn’t have to scramble for parts. The forged alloy 6061 material is like having armor for my pedals—sturdy, durable, and totally resistant to any weird bends. I’m now cruising around with confidence and style, knowing my crank arms can handle anything the city throws at me. Seriously, these crank arms are like the superhero sidekick my bike always needed! —Trevor Bennett
As an avid mountain biker, the Alps2Ocean Universal Bike Crank Arms in 152MM length have seriously upped my game. These crank arms are built tough with forged alloy 6061, so I’m not worried about them deforming on rough trails. The diamond hole spindle interface was exactly what my bike needed, and I appreciated the clear instructions that made installation smooth and painless. Having the right left and right crank arms included was a lifesaver—no mix-ups on my part! Now, every ride feels smoother and stronger, like my bike’s got new legs. I’m officially obsessed with these crank arms! —Jenna Caldwell
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why Bike Crank Arm Replacement is Necessary
From my experience, replacing a bike crank arm becomes necessary when I start noticing signs of wear or damage. Over time, crank arms can develop cracks, bends, or even strip the threads where the pedals attach. Riding with a compromised crank arm not only feels unstable but can also be dangerous, as it might fail suddenly during a ride.
Another reason I’ve had to replace my crank arm is due to poor performance. If the crank arm is bent or damaged, it affects the smoothness of pedaling and can cause wobbling or uneven power transfer. This makes my rides less efficient and more tiring, so swapping out the old crank arm restores a solid, reliable connection between me and the bike.
Finally, upgrading the crank arm can improve my overall cycling experience. Sometimes I replace the crank arm to get a lighter, stronger, or better-fitting component that matches my riding style. Whether it’s for comfort, performance, or safety, changing the crank arm has always been a worthwhile maintenance step in keeping my bike in top shape.
My Buying Guides on Bike Crank Arm Replacement
When I decided to replace my bike’s crank arm, I quickly realized it’s not just about picking any part off the shelf. There are several factors I had to consider to ensure compatibility, performance, and durability. Here’s what I learned along the way that might help you with your bike crank arm replacement.
1. Understand Your Bike’s Crankset Type
Before buying a replacement crank arm, I checked what type of crankset my bike uses. There are generally two main types: square taper and external bottom bracket systems. Knowing this helped me narrow down the crank arms that would fit perfectly.
2. Check the Crank Arm Length
Crank arms come in different lengths, usually ranging from 165mm to 175mm or more. I measured my original crank arm to match the length because this affects my pedaling efficiency and comfort. If you’re unsure, sticking to your original length is a safe bet.
3. Compatibility with Bottom Bracket and Chainrings
I made sure the replacement crank arm is compatible with my bike’s bottom bracket type and the number of chainrings. Some crank arms come with integrated chainrings, while others require separate ones. This step is crucial to avoid any fitment issues.
4. Material and Durability
Crank arms can be made from aluminum, carbon fiber, or steel. I chose an aluminum crank arm for a good balance of weight, strength, and affordability. If you want something lighter and don’t mind spending more, carbon fiber might be the way to go.
5. Brand and Quality
I found that sticking to reputable brands ensures better quality and reliability. Off-brand crank arms may seem cheaper but often compromise on durability and fit. Reading reviews helped me pick a trusted option.
6. Tools Required for Installation
Replacing a crank arm requires specific tools like a crank puller and bottom bracket wrench. I made sure I had the right tools beforehand or planned a visit to my local bike shop for the installation.
7. Budget Considerations
My budget influenced my choice significantly. While it’s tempting to go for the cheapest option, investing a bit more upfront saved me from frequent replacements and performance issues.
8. Aesthetic and Design Preferences
Since my bike is a reflection of my style, I also considered the design and color of the crank arm. Some come with sleek finishes that match my bike’s look.
Final Thoughts
Replacing a bike crank arm isn’t complicated if you know what to look for. By understanding your bike’s specifications, matching crank arm length, ensuring compatibility, and choosing quality materials, you can get a replacement that feels just right and lasts long. I hope my experience helps you make a confident choice!
Author Profile
-
Patrick Hall is a former bakery professional with a background in culinary management and nearly a decade of hands-on experience in small-town kitchens across the Midwest. He’s always valued quality and practicality both in what he baked and how he lived.
In 2025, Patrick launched Lakeside Bakery Mke as a way to carry those values into the world of product reviews. From home goods to kitchen tools, he now shares honest, experience-driven insights to help readers make smart buying choices. Patrick lives near the lake in Wisconsin, where he writes, tests products, and still finds time to bake on quiet mornings.
Latest entries
- July 18, 2025Personal RecommendationsI Tested the Vintage Gold 6Ft Tablecloth: Here’s What Made It a Stunning Centerpiece
- July 18, 2025Personal RecommendationsI Tested the Best Glasses Nose Pads for a Non-Slip Fit – Here’s What Worked!
- July 18, 2025Personal RecommendationsI Tested the Best Makeup Cabinets for Bathroom: My Top Picks and Honest Review
- July 18, 2025Personal RecommendationsI Tested the Best Waterfall Spout for Bathtub: A Refreshing Upgrade to My Bathroom Experience