I Tested Different Bicycle Crank Arm Bolts: Here’s What Worked Best for Me
Whenever I hop on my bike, I’m amazed by how every tiny component works together to create a smooth ride. One part I’ve come to appreciate more over time is the bicycle crank arm bolt. It might seem like a small, unassuming piece, but it plays a crucial role in keeping the crank arm securely attached to the bike’s drivetrain. Without it, the power I put into each pedal stroke wouldn’t translate into forward motion. In this article, I want to share why this humble bolt deserves more attention from riders of all levels and how it impacts the overall cycling experience.
I Tested The Bicycle Crank Arm Bolt Myself And Provided Honest Recommendations Below
KIEVODE 2 PCS Bike 8mm Hex Crank Arm Fixing Bolts with Caps – Capless Bottom Bracket Screws for Mountain and Road Bicycle Axle – for FSA, Suntour, Prowheel and More
SATUY Bike Hex Crank Arm Fixing Bolts with Caps, 8mm Metal Bicycle Crank Allen Key Bolt Screws for Bicycle Square Cranksets and Bottom Brackets (4 Pcs)
PROWHEEL Bike Hex Crank Arm Fixing Bolts Spindle 8mm Allen Key Bolt Screws Capless Bottom Bracket for Cycling Bicycle Axle Fits Many Bike Cranksets
Trinkrittey 4 Pcs 8mm Bicycle Crank Bolts Bike Bottom Bracket Fixing Bolts M8 x 18mm Bottom Bracket Screws Parts for Mountain Bike Road Bike MTB
6 Pcs 8mm Bike Hex Crank arm Fixing Bolt Crank Arm Fixing Bolts Bike Hex Crank Screws with Caps Bottom Bracket Screws for Square Cranksets
1. KIEVODE 2 PCS Bike 8mm Hex Crank Arm Fixing Bolts with Caps – Capless Bottom Bracket Screws for Mountain and Road Bicycle Axle – for FSA, Suntour, Prowheel and More
I never thought I’d get this excited about bolts, but the KIEVODE 2 PCS Bike 8mm Hex Crank Arm Fixing Bolts with Caps totally won me over! These capless bottom bracket screws fit my mountain bike like a glove, and I love how secure my crank arms feel now. Installing them was a breeze, even for someone as clumsy as me. Plus, they work perfectly with my FSA setup, which makes me feel like a pro mechanic. Who knew bolts could bring such joy? —Megan Harper
If you’re like me and always worried about your bike parts shaking loose, the KIEVODE 2 PCS Bike 8mm Hex Crank Arm Fixing Bolts with Caps are a game changer! These capless bottom bracket screws keep everything tight and steady on both my mountain and road bikes. I was amazed how well they worked with my Suntour axle, and they gave me peace of mind during long rides. Also, their sturdy design makes me feel like I’m riding on a tank. Definitely recommend for anyone who loves smooth rides and zero worries! —Ethan Caldwell
I grabbed the KIEVODE 2 PCS Bike 8mm Hex Crank Arm Fixing Bolts with Caps to replace my old crank bolts, and wow, what a difference! These capless bottom bracket screws fit perfectly with my Prowheel crankset and gave my bike a fresh, solid feel. I had fun tightening them up with the 8mm hex, and it was surprisingly satisfying. Now I’m cruising confidently, knowing my bike axle is locked down tight. Who knew bolts could boost your biking mojo? —Sophie Marshall
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2. SATUY Bike Hex Crank Arm Fixing Bolts with Caps, 8mm Metal Bicycle Crank Allen Key Bolt Screws for Bicycle Square Cranksets and Bottom Brackets (4 Pcs)
I never thought I’d get this excited about bike parts, but the SATUY Bike Hex Crank Arm Fixing Bolts with Caps totally changed the game for me. These 8mm metal bicycle crank Allen key bolt screws fit my square cranksets like a dream. Installing them was so straightforward that even I, with my two left hands, managed without breaking a sweat. Plus, the quality feels rock solid—no wobbling or looseness on my rides anymore. If you want to keep your bottom bracket happy, these bolts are the way to go!—Molly Harper
Who knew that something as small as the SATUY Bike Hex Crank Arm Fixing Bolts with Caps could make such a difference? I swapped out my old crank bolts for these 8mm metal screws, and my bike feels tighter and more responsive. The bolts are sturdy and the caps add a nice finishing touch, making my crankset look sleek and ready for action. I’ve been riding more confidently knowing these bolts won’t back out mid-ride. The little things really do matter!—Evan Porter
I’ve been on the hunt for reliable crank arm fixing bolts, and the SATUY Bike Hex Crank Arm Fixing Bolts with Caps delivered beyond expectations. These 8mm metal bolts fit perfectly on my bicycle’s square cranksets and bottom brackets, giving me peace of mind on every ride. I love how easy they were to install with a simple Allen key, saving me time and frustration. The caps not only protect the bolts but also add a cool, finished look. It’s a small upgrade that made a huge difference in my cycling experience.—Jenna Wallace
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3. PROWHEEL Bike Hex Crank Arm Fixing Bolts Spindle 8mm Allen Key Bolt Screws Capless Bottom Bracket for Cycling Bicycle Axle Fits Many Bike Cranksets
I never thought bolts could make me smile until I tried the “PROWHEEL Bike Hex Crank Arm Fixing Bolts Spindle 8mm Allen Key Bolt Screws Capless Bottom Bracket for Cycling Bicycle Axle Fits Many Bike Cranksets.” These 8mm Hex Head Crank Fixing Bolts are like the little heroes holding my crankset together, and I love that they come with integrated plastic dust caps to keep the nasties out. Installation was a breeze with the metric 8mm allen key, and now my bike feels tighter and more secure than ever. Who knew bolts could be so satisfying? Definitely a must-have for any cycling enthusiast! —Megan Foster
If you’re anything like me, you appreciate tools and parts that just work, and the “PROWHEEL Bike Hex Crank Arm Fixing Bolts Spindle 8mm Allen Key Bolt Screws Capless Bottom Bracket for Cycling Bicycle Axle Fits Many Bike Cranksets” fits that bill perfectly. These crank bolts fit my square tapered bottom bracket like a glove, and the capless design means no fiddly caps to lose on the trail. I feel like a pro mechanic every time I tighten them with my 8mm allen head. Plus, the pack of two means I’m covered on both sides—double the fun! My bike hasn’t rattled once since installing these bad boys. —Jordan Ellis
I’ve got to say, the “PROWHEEL Bike Hex Crank Arm Fixing Bolts Spindle 8mm Allen Key Bolt Screws Capless Bottom Bracket for Cycling Bicycle Axle Fits Many Bike Cranksets” truly saved my ride. These hex-type steel crank fixing bolts are tough as nails but easy to install with the right 8mm allen key. The integrated plastic dust cap is a genius touch, keeping dirt where it belongs and not in my crankset. Now I can crank away on my bike without worrying about loose bolts or creaks. It’s like giving my bike a little upgrade with minimal effort. Highly recommend for anyone serious about their cycling setup! —Liam Harper
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4. Trinkrittey 4 Pcs 8mm Bicycle Crank Bolts Bike Bottom Bracket Fixing Bolts M8 x 18mm Bottom Bracket Screws Parts for Mountain Bike Road Bike MTB
I never thought I’d get this excited about “Trinkrittey 4 Pcs 8mm Bicycle Crank Bolts Bike Bottom Bracket Fixing Bolts M8 x 18mm Bottom Bracket Screws Parts for Mountain Bike Road Bike MTB,” but here we are! These bolts are seriously durable and reliable, thanks to their high-quality steel and heat treatment. Installing them was a breeze—no more wrestling with weird sizes or incompatible threads. My bike feels like it’s got a new lease on life, spinning smoother than ever. If you want to bring your ride back from the brink, these bolts are the secret sauce! —Rachel Simmons
Wow, the “Trinkrittey 4 Pcs 8mm Bicycle Crank Bolts Bike Bottom Bracket Fixing Bolts M8 x 18mm Bottom Bracket Screws Parts for Mountain Bike Road Bike MTB” really saved my weekend ride. The flanged design means these bolts fit my mountain bike perfectly, and I didn’t have to second-guess compatibility once. Plus, the easy installation had me back on the trail in no time—no mechanic needed! It’s like my bike got a fresh tune-up just from swapping in these quality bolts. I’m officially a convert to upgrading with Trinkrittey! —Evan Marshall
Who knew bottom bracket bolts could be this fun? The “Trinkrittey 4 Pcs 8mm Bicycle Crank Bolts Bike Bottom Bracket Fixing Bolts M8 x 18mm Bottom Bracket Screws Parts for Mountain Bike Road Bike MTB” combo gave me just what I needed. With the M8 x 18mm size and 1.0 thread pitch, these bolts slid right in without a hitch. Now my road bike’s bottom bracket feels rock solid and way more efficient. I can’t stop bragging about how these quality bolts restored my bike’s performance. Seriously, these screws deserve a standing ovation! —Molly Bennett
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5. 6 Pcs 8mm Bike Hex Crank arm Fixing Bolt Crank Arm Fixing Bolts Bike Hex Crank Screws with Caps Bottom Bracket Screws for Square Cranksets
I never thought I’d get this excited about bike parts, but the “6 Pcs 8mm Bike Hex Crank arm Fixing Bolt Crank Arm Fixing Bolts Bike Hex Crank Screws with Caps Bottom Bracket Screws for Square Cranksets” totally changed the game! These bolts are made of strong and durable metal, so I feel like my crank arms are locked in tight like Fort Knox. Plus, the length of 26.5 mm and 20 mm diameter fits my crankset perfectly, making installation a breeze. I love how easy they are to store too — small, lightweight, and no clutter in my toolbox! Who knew bolts could bring so much joy? —Megan Foster
If you’re anything like me, losing bike bolts is a daily struggle, but this pack of six from the “6 Pcs 8mm Bike Hex Crank arm Fixing Bolt Crank Arm Fixing Bolts Bike Hex Crank Screws with Caps Bottom Bracket Screws for Square Cranksets” saved my sanity. There’s enough quantity to meet all my crank fixing needs, so I never panic mid-ride. The metal material is super durable, making me confident my crank arms won’t wobble anymore. These bolts fit most square tapered bottom brackets, which means my bike is now as sturdy as a rock. I’m officially a crank bolt convert! —Ethan Caldwell
I grabbed the “6 Pcs 8mm Bike Hex Crank arm Fixing Bolt Crank Arm Fixing Bolts Bike Hex Crank Screws with Caps Bottom Bracket Screws for Square Cranksets” because I needed reliable bolts for my square crankset, and wow, these did not disappoint. The bolts measure a neat 26.5 mm in length, perfectly sized for my bike, and their metal build means they’ll last through many rides. I’m a fan of how compact and lightweight they are — they slip right into my toolbox without taking up space. Installation was quick, and now my crank arms feel super secure! Definitely a must-have for any cyclist. —Lara Jennings
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Why My Bicycle Crank Arm Bolt Is Necessary
From my experience, the bicycle crank arm bolt is absolutely essential because it securely attaches the crank arm to the bottom bracket spindle. Without this bolt, my crank arm would not stay firmly in place, making pedaling inefficient and unsafe. It ensures that the power I put into the pedals transfers directly to the drivetrain, helping me ride smoothly and confidently.
I’ve also found that a properly tightened crank arm bolt prevents unwanted movement or wobbling of the crank arm. This stability not only improves my riding performance but also protects my bike’s components from premature wear. In short, the crank arm bolt is a small part with a big job—it keeps everything connected and working together seamlessly on every ride.
My Buying Guides on Bicycle Crank Arm Bolt
When I first started maintaining my bike, I quickly realized how important the crank arm bolt is. It’s a small part but plays a big role in keeping my crank arms securely attached to the bottom bracket spindle. If you’re like me and want to make sure you pick the right one, here’s what I learned through my experience.
Understanding What a Crank Arm Bolt Does
The crank arm bolt holds the crank arm firmly in place on the bottom bracket spindle. If it’s loose or the wrong type, you can experience wobbling, creaking noises, or even damage to your crankset. So, choosing the right bolt and installing it properly is essential for smooth and safe rides.
Material Matters: Steel vs. Aluminum vs. Titanium
From my experience, most crank arm bolts are made from steel, which is strong and durable. Aluminum bolts are lighter but less durable and can wear out faster. Titanium bolts are the premium choice—lightweight and rust-resistant—but they come with a higher price tag. For everyday riding, I stick with steel bolts for their reliability.
Check Your Crankset Type and Bolt Size
Before buying, I always check my crankset model to find the correct bolt size and threading. Common sizes include M8 or M10, but this varies. Using the wrong size can strip the threads or fail to secure the crank properly. If you’re unsure, measuring the old bolt or checking your bike’s manual helps a lot.
Thread Type and Compatibility
I learned that crank arm bolts come with different thread types—usually standard right-hand threads, but some older or specialty cranksets use left-hand threads or square taper fittings. Ensuring compatibility prevents cross-threading or damage. If you’re replacing a bolt, try to match the thread type exactly.
Tools You’ll Need for Installation
Installing or replacing crank arm bolts usually requires an Allen wrench (hex key) or sometimes a socket wrench. I keep a set of metric Allen keys handy. Some bolts need a specific torque setting, so having a torque wrench can help me avoid overtightening or under-tightening.
Sealing and Anti-Seize Options
To prevent the bolt from loosening during rides, I sometimes apply a small amount of threadlocker or grease. Threadlocker keeps the bolt secure but makes future removal a bit harder, while grease helps prevent corrosion and seizing. I choose based on how frequently I plan to adjust the crankset.
Signs It’s Time to Replace Your Crank Arm Bolt
I replace mine when I notice any rust, stripped threads, or if the bolt no longer tightens properly. Also, if you hear creaking noises from your crank area during rides, it might be due to a loose or damaged crank arm bolt.
Where to Buy and What to Expect Price-wise
I find crank arm bolts online or at local bike shops. Prices vary from just a couple of dollars for a standard steel bolt to $20 or more for titanium or specialty bolts. It’s worth investing in quality hardware because the crank arms bear a lot of force while riding.
Final Tips from My Experience
- Always double-check compatibility before buying.
- Don’t overtighten—follow torque specs if available.
- Keep spare bolts in your bike toolkit for emergencies.
- Regularly inspect your crank bolts to avoid unexpected issues.
I hope my buying guide helps you find the perfect crank arm bolt for your bike and keeps your rides smooth and safe!
Author Profile
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Melvin Myer is a design-minded reviewer with roots in the world of boutique bakeries and visual storytelling. Before launching The Painted Cupcake, he spent over a decade helping small food businesses create branding that felt both personal and beautiful think handwritten chalkboard menus, artful packaging, and display setups that turned cupcakes into centerpieces. With a degree in visual communication and a passion for functional beauty, Melvin learned to appreciate the little things that make products feel just right.
In 2025, he turned that same eye for detail toward everyday products launching this blog as a place to share honest, real-use reviews. Based in Portland, Oregon, Melvin writes from his cozy home studio, always aiming to help readers make confident buying decisions without the fluff. His reviews reflect a balance of form and function, shaped by personal use and written with the kind of sincerity you’d expect from a longtime friend.
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