How to Replace Cotterless Crank Arms
Crank removal and installation procedure on a square-spindle, sealed bottom bracket.
- 02:08 - The crank bolts should be torqued to about 35 foot-pounds, or 420 inch-pounds.
This tutorial will demonstrate how to remove and install square-spindled crank arms. I’ve based this tutorial on cranks attached to a sealed cartridge bottom bracket. I’ll cover the loose-bearing style in a future tutorial.
To remove the bolt, you’ll need either an 8mm allen key or 14mm socket wrench. To remove the crank arms, you’ll need a crank puller, a 16mm open-end wrench, and an adjustable wrench. If possible, a torque wrench should also be used for tightening.
Crank Arm Removal
In order to safely remove the right side, you’ll have to shift the front derailleur onto the smallest chainring, and then carefully remove the chain and rest it on the bottom bracket, so that it doesn’t interfere with the crank arm removal.
Using the crank arm for leverage, loosen and remove the tightening bolt with your allen key or 14mm socket wrench. Be careful not to skin your knuckles on the chainring teeth.
Before using the crank puller, make sure it is fully extended so that the internal driver does not extend past the external threads.
Note: If crank threads are damaged, there are a few solutions at Park Tools.
Carefully thread the external threads of the crank puller clockwise into the crank arm. Avoid cross-threading, which will damage the crank and prevent future removal.
Once the crank puller is fully threaded, place the adjustable wrench on the external flats and turn the internal driver clockwise until it stops. Turn the driver clockwise using a 16mm wrench, until the crank arm pulls free of the spindle. Repeat the same process to remove the left crank arm.
Crank Arm Installation
Before re-installing the cranks wipe both the square spindle and the crank’s spindle fitting to make sure there is no dirt or grease on either surface.
Now slide the right crank’s spindle fitting onto the spindle. Before installing the bolts, grease under the head and along the threads of both bolts. Thread the bolt all the way into the spindle threads and torque the bolt to about 35 foot-pounds, or 420 inch-pounds.
Set the chain back on the chainring and repeat the same installation procedure on the left side, making sure the crank arm is pointing opposite the right side.
- Park Tool: Bicycle Torque Specifications
- Park Tool: Crank Installation and Removal
- Sheldon Brown: Cotterless Cranks
- Bicycle Torque Specifications
- Shimano TL-FC10 Crank Extractor
- Park Tool Wrench Combo Set
- Park Tool PAW-12 Adjustable Wrench
- Park Tool WTK-2 Essential Tool Kit
- Park Tool SK-3 Starter Mechanic Tool Kit
- Park Tool PK-3 Professional Tool Kit
Discuss this topic in the Bicycle Repairs and Mechanics Forum
Hi. I have Shimano HG601 chain 11-speed and I want to add the master link to it. Watched some videos but I have to be 100% sure, that is why I hereby present my brief plan: 1. there is a black link in the chain 2. I use the chain tool to push that black pin out 3. then I add the master link 4. finish up with using the special tongs to press that master link into the chain Does this look like a g...Read more
I just bought some spacers on amazon. Can I take these bars up higher? Right now it’s at seat height, maybe. B244096A-8E83-4716-B335-7FC45A98D0AB.jpeg (Size: 56.94 KB / Downloads: 17) ...Read more
Just out of curiosity; has anyone ever tried using those "super lubricants" in the automotive aisle (e.g. "Slick 50", etc)? Seems I remember a commercial with Al Unser Jr. (or some race car guy) draining their oil from the car and then running around the track at full speed. I am, as an experiment, going try a few drops on a "test" bike just to see how the BB and hubs feel w/o grease. I used to kn...Read more
Hi! Many apologies for my state of panic, but a friendly commenter on Reddit (/r/bikewrench specifically) suggested that I cross-post my question here to see if anyone here could help, so please forgive the rough copy-paste-edit job from my original post there. Basically... with the pandemic going on I recently got a nice custom gravel wheelset built for me using White Industries CLD hubs, which...Read more
My Apollo feud rear gear set was trashed when the bike was loaned ,the click on lock on was damaged how can I fix it please so I can be mobile again.thank you...Read more
Hello! I have a grinding sound coming from my front wheel and I can't figure it out. I took apart the hub and cleaned the ball bearings, which made the wheel spin more smoothly but the sound is still there. I have attached a link to an audio recording of the sound. The sound seems to occur at a slow and steady pace, even when i'm biking pretty fast. I have a single speed bike with rim brakes. any...Read more
Hi. I have a fairly cheepish bike, Appolo Evade Mountain Bike. (The reason for it having a freewheel was probably due to price not age). Anyways. So, there is a tiny bit of freewheel wobble which I have come across on a lot of freewheel bikes so I never considered this a problem. Freewheels just tend to get a little bent right? Despite this, shifting is just fine and smooth and the whole drive ...Read more
I have an original 2010 Trek District 1st edition. I need the rear cog 22t 9 spline replaced, I've stripped out my original one. I can not find this part anywhere and if I go to trek website or even gates, they say the part does not exist. When I contacted gates they informed me that they do not have any and that I could maybe find it through a 3rd party source. I really do not want to change it ...Read more
I'm a former racer attempting to build a business selling bike bleed kits, and I am in this class where we are working on a product/service feasibility assignment. If you're a biker or have some knowledge in the cycling industry, could help me out in taking this quick survey for a business idea of selling bleed kits for bikes, motorcycles, and other vehicles? It involves looking over a one-page ...Read more
Greetings all, Looking for a little advice on why and how to fix the Presta air valve on my Park Tools floor pump. It’s a dual presta Schrader attachment (that in not removable) on the pump and air flow simply stopped flowing into the presta despite lock being on to block Schrader flow. There has been some lead up warning as it became harder to pump and would ‘pop’ when whatever was blocki...Read more
I'm looking for a compatible thumb or bar-end shifter for a Campy 9-speed derailleur. The Jtek ShiftMate 3 looked like the perfect solution as it would allow me to use a cheap Shimano-compatible shifter, but they're only sold by SKS Cycles in the UK and I'd prefer not to ship back to the US from overseas. Does anyone know of other solutions out there (besides friction shifters)?...Read more
All, Just had my brakes replaced and repaired. I noticed that my rear v-brakes were skewed to one side. Not sure how to fix or reconfigure this. Any help is appreciated. The attachment shows the skewed v-brakes leaning to one side. rear-v-brakes.jpg (Size: 57.44 KB / Downloads: 113) Thanks....Read more
I am building my dream bike and I want to put a Chris King bottom bracket in it. It is just very hard to figure out which one is the right one. I plan on getting a Sram DUB crankset because it has the look I´m going for, with a decent price tag. I have a Cinelli Vigorell disc frame. I believe that in order to put the DUB crankset on I would need the King Threadfit 30. I don't know what the differ...Read more
Hi, I followed the park tool instruction for the front and rear derailer alignment but the Front Derailer moves to the bigger cog only when I'm not riding the bike. On the stand, it moves to the bigger cog just fine but whenever I ride it doesn't move. It shifts perfectly on the stand but seems to hit the h limit screw when sitting and actually riding (the cables are not being clamped in any way ...Read more
I've watched the Park Tool video on removing and installing a new crank. I've completed the removal/install and torqued to 45Nm (hoping this is correct for a cheap SR Suntour XCT since I can't find manufacturer guidance). I used a tiny bit of grease (but let's not go down that rabbit hole for this question). Here's where I'm starting to find conflicting info. This document on Sheldon's siteexpla...Read more