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.
[attachment=5352]I hope someone has run across this before. I have a Giant mountain bike and I have been using it on the paved trail a lot lately. Recently, I began hear a clanking sound after I ride about 10 miles. Sounds like when a pedal hits a kickstand that isn't all the way up. I can't duplicate it on a bike stand. It doesn't start until 10 miles and after 15 miles, I get an added rubber squeaking sound on top of the clank. The noise happens in the same pedal position every time and particularly when I'm pedaling hard and hardly at all if I pedal lightly. I had the derailleurs and s... Read more >>
I shipped my Dawes Super Galaxy home and have just had an unfortunate experience of not being able to re-attach my left Shimano M324 pedal.
It looks threaded, but I still have hopes as I think it's only the top couple of rings on the inside.
From what I can tell the pedal thread is fine.
I know there are tools out there to fix a thread. I'm hoping that mine is not so bad that I need a new crank set. Can anyone offer any advice?
The Gala... Read more >>
When I cycle my bike makes a clicking sound. Also when I change gear it won't change the first time I have to keep putting it back to the previous one and back to it and eventually it will change. Also when I put it into gear 1 the Chain will come off. This started happening weeks after I brought it I went back to the shop as it has a 12 month warrantee but they said it's not covered under the warrantee as it's wear and tear
does anyone know what the problem is and is it an easy fix or do I have to take to a repair shop?... Read more >>
I have a Schwinn Gateway and need to know what type of crank puller to purchase? Would the park tool cwp-7 work with this crank?... Read more >>
Hi, the thread on my crank arm has worn completely away, I have a budget road bike 14 speed but can not find a crank set online can any one help or come up with any alternatives. .. thanks, uk... Read more >>
I was wondering if someone could tell me whether I would be able to fix Power Grip straps to my pedals?... Read more >>
The cruisers right pedal felt slightly askew, it was late and only a mile from home. I gave it a cursory inspection, I'd check it at home on the stand.
I gingerly rode on a few revolutions and BAM!
1) Right foot slams to the ground and pushes forward off the toes
2) Gonads pound into the nose of the seat
3) Chest hurtles towards the the bars
4) Body rotates slightly to the right as the right foot is dragging
5) Left foot tries to slide outwards off the studded pedals
6) Every ounce of strength in my being tries to lock my shoulders, pecs and bic... Read more >>
Haven't rode in years, just bought a new MTN Bike and the pedals are a longer distance apart than I was used to.....I want to replace the crank arms w/shorter ones and are the fittings universal? and where can I purchase them?... Read more >>
Hello, I just got this bike. I paid 50 bucks which I thought was fair. It is a Giant Acapulco probably from the late 90s/early 2000s. The bike functioned well until today when I felt the pedal wobbling and the pedal fell off. So I was reading a few other forums and they said that the crank arm was most likely the problem. The nut also appears to be stripped. So my question is should I just go to a bike shop and get a new nut or should I just order a crank arm set off of ebay. Also if I order a crank arm off ebay which one should I get. I am looking to spend under 30 bucks for this sinc... Read more >>
Got the Sram red chain rings. Definate difference. The shift is quicker and it does not hesitate at all. Feel much more confident in the bike now. Feels real good. Took it to a park in the area where there are some real twisty trails and quick up and down hills. It requires a good bit of shifting and it really performed well. Super fun ride! Am happy to put this chapter behind me and now just ride!
Bill... Read more >>
There is this random clicking nose that sounds like it's coming from the crank shaft possibly. As I pedal you can hear a clicking noise as if two pieces of metal are tapping each other. It's kinda rusty back there as I had to leave my bike outside during the winter.
What does someone recommend I do?
Thanks.... Read more >>
I have a folding bike with 7 speed freewheel in the back. My front crank needs changing. I have seen one but it will only run a single speed 1/8" chain. My question is can I run a single speed crank & chain with a 7-speed freewheel?
Thank you in advance for any help.... Read more >>
As you may remember,I am having a big prob with fd shifting up from little ring to big ring.bike is back in the shop at this time. They are thinking that the trouble is the fsa crank and rings. The rails are notbuilt like the sram and shimano. The cervelo has Rival on it w/fsa crank. we are talking about upgrading at shop cost for materials to shimano crank. I guess my question is do i want to replace the whole crank or just the rings? What would be the advantage to a complete replacement? I was thinking about replacing the rings with red an see what happened.
Than... Read more >>
This has might of been already been said, but my crank is wobbly, I've tightened the bolts on both sides, but in truth they were already tight!?
Do you think I need to replace something?... Read more >>
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 >>