9. How to Replace Cotterless Crank Arms
Crank removal and installation procedure on a square-spindle, sealed bottom bracket.
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.
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.
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.
I need to service and or replace the Raceface ISIS drive bottom bracket on my bike.
I have the drive side crank removed, abd even have the drive side BB cup off...however I am unable to get the other (non drive side) crank arm off, the bracket bolt will not budge. And I can not get the drive out.... what do I do?... Read more >>
I hope I'm posting in the right place.
So as I was riding this morning, I noticed my pedals starting to loosen.
Upon closer inspection, looks like the entire crank is loose, but I have no idea how to retighten it.
(ignore the cord in the second image, those are my headphones)
In the fourth image, the ball bearings are exposed.
Thanks!... Read more >>
I saw this seller selling these single speed cranks on Ebay as per link below.
How do you go about choosing the correct number of teeth crank f... Read more >>
I have a Dawes 1500, under a year old and started hearing ¨popping¨coming from the crank área. I´ve ridden the bike pretty much every day for the past 3 months since I moved to mexico. I now have some minimal lateral movement in the crank área and was wondering on lets say ¨average¨cost for a repair like this, if there is such a thing. I don´t want to get railroaded when I take it to the bike shop here. Also, in the future could using clip on pedals be better instead of my current straps. I am riding alot of hills and standing for a good part of the ride. Thanks for help and for... Read more >>
my first post on here
Was just given a carrera subway 2, which needs crank replacing. The thread on the crank that holds the pedal is worn and can keep the pedal on. So, I need to replace it. When I looked at it, I notice that the bolt that holds the crank to the bottom bracket is actually not a normal bold, but an Allen Wrench Hex key one. So, my question is if the procedure for removing and replacing the crank wil be same as with other ... Read more >>
This is my first post. I did read a lot of the forums when deciding on which bike to buy. I decided on the Vitus Vee 1. Now it has just arrived and I already need some advice from the experts as I have very little knowledge.
I am having problems with the right hand pedal. It screws in a little then stops. When I looked more closely it seems there is a problem with both the pedal and the crack arm threads.
The pedals threads are painted black but there is a part that is silver, showing the metal. So I would expect this means that it is damaged. I... Read more >>
Good evening all.
I have a few sets of one piece cranks, all the same brand, that the sprocket tab (?) has broken off of. I do not have the tabs as they both are from 1985. Does anyone make replacement tabs that can be welded to the cranks so they can be used again? Other than the tabs missing they are in terrific shape and are the stock cranks for my bike.
Any help or info is appreciated.
Thanks... Read more >>
I'm getting confused about BB length, type and all the specs involved in selecting a crank set. All I know for sure, is that I have a 2009 Cannondale F5 that has a stock FSA CK-306TTT crankset, 22/32/44 (specs HERE) .
Item Number / Model Name
BB-8420 / Power Driver BB(PD) for CK-306,
BB Shell 68mm including E-type / 73mm English (BC1.37”)
Additional FSA info Read more >>
I just need a little clarification on the torque specs in the Parks repair manual. In the torque specifications for Shimano crank bolts they give a broad range of torque values(305 inch pds - 390 inch pds).
-How do you know what to tighten the bolt to??
-Should you go to the lowest, middle or the highest torque value??
-If the cranks don't get tight enough, you can end up with a wallered out crank that will never stay tight, right??
-If you go too tight you might split the crank, right??
Sorry for all the ??'s... Read more >>
My 1-speed crank need replacing and currently I have a 122mm bottom bracket with it. Ive seen a cheapie 1-speed crank on Ebay for around £15. Would the same 122mm bottom bracket definitely fit this new crank? Or is it the case that all cranks are made differently and might need a shorter or longer bottom bracket?
Thank you... Read more >>
I have a Fuji 1.7c roadbike with the threads stripped out of the right crank arm. Cranks are Fuji branded square taper 172.5mm length and 50/34t chainrings. I found on Ebay FSA VERO ROAD CRANKS CRANKSET 172.5MM 50-34 COMPACT crank arms for around $60.
All of the numbers I can see match up.. Is it safe to say they will bolt up to my bb and line up with my derailleur or is there anything else I need to consider?
I've also found a Nashbar isis CR2 compact crank set for $50 and a isis bb by Nashbar for $20. Would that be a better option for around the sa... Read more >>
First of all, sorry if I need a bit of explaining - first bike I've owned since I was a kid and I've never done repairs. The other day I was biking to work when I took a stroke forward on the right and the pedal just slipped down. The pedals are now at similar levels (instead of opposite as they should be), making my bike unbikeable, sadly.
I have no idea what the problem is, but there were a few symptoms (I think) before this happened. There's been a clicking noise for a while whenever I take a stroke forward, and the other day I had a bit of a wipe out. ... Read more >>
My MTB has a riveted triple ring chainset/crankset and I need to replace it. It is a Suntour SR 180 XR with 24/34/42 teeth. My bike is 21 speed.
1 : Is it in any way feasible to drill out the rivets on the chain rings and replace with discrete chain rings?
2: I have looked online to see what is available in cranksets. The specs of some products indicate that they are suitable for 9 speed. So does the crankset have to match the rear sprockets? Does this have something to do with chain ring spacing?... Read more >>
Need some 1/2inch clipless pedals for a single speed project. Any ideas?... Read more >>
I want to disassemble and rebuild a set of crank brothers pedals. What sort of tool is necessary? I presume a tube spanner would be necessary and the nut looks about 9mm?... Read more >>