Calvin Jones here , Park Tool Company .
This video will walk through the removal and installation of Bonner brackets into threaded frame shells including the three piece cartridge style and designs that use threaded barring cups , adjustable cup and cone bonum brackets are not covered in this video .
Also for cap no ultra torque systems , the cups are not removed for bearing replacement as the bangs are installed on the crank spindles .
See our full bottom bracket playlist here .
If you have one of these bottom bracket styles or if you're unsure of the bottom bracket design , you have the frame shell for the bottom brackets .
In this video use internal threads to accept bearings .
The bottom brackets that use these threads can be one of two styles cartridge Bonner brackets feature a spindle integrated into bearings as a self contained unit .
These are used on three piece crank sets which have separate left and right crank arms which attach to the integrated spindle threaded through spindle .
Bonner brackets are comprised of a cup with a cartridge bearing .
These Bonner brackets are threaded into the frame and then the crank spindle is passed through the bearings .
Typical tools and supplies include an appropriate bottom bracket tool to fit the cup .
A three H drive ratchet or breaker bar .
A tar rench , an appropriate thread preparation .
We will begin with the cranks removed .
See our crank playlist for information on crank removal , especially if you are reusing the crank set .
Make note of your system , use spacers between the frame and the cup will begin by removing the non drive side , bottom bracket cup .
But first , you will need the proper tool .
There are many options to find the correct tool .
You should count how many notches are on the tool fitting , then measure the outside diameter with a caliper .
See this page on park tool dot com .
For a detailed description of the tools and parts , they've hit a 38 inch drive ratchet or breaker bar to drive the tool , make sure the tool is fully and evenly engaged on the tool fitting , apply pressure to the tool while loosening so it does not slip off under heavy load .
Some models , the bottom bracket cups have very shallow tool engagement be especially careful to hold the tool against the bottom bracket fitting , the cup is removed , pull out any protective sleeve that is still inside the shell .
Next , remove the drive side cup for shells with the common English threading , the drive side is the left hand thread .
It tightens to the left and moves to the right turn the drive side clockwise and remove it .
Note for bikes that use the Italian threading standard .
Both non drive and drive side are right hand threads , inspect the cups for markings stating 36 by 24 to confirm this standard , turn these counterclockwise to remove .
If after you remove the cups , you find that they look like this and the bottom bracket shell is not threaded .
You have a thread together style bottom bracket .
See this video for the proper installation procedure , wipe the bottom bracket , clean of dirt .
The interface between the crank and the bottom bracket can be complex with a lot of things to consider for parts compatibility and availability .
Consult the component manufacturer or contact your local bike shop .
Preparation is an important part of the installation process .
A new bond bracket may come with a dry thread locker already installed if so it can be installed as is another option is a liquid thread locker such as Park tool T L R one .
This lubricates the thread when tightening and then expands and hardens as it dries helping the cup stay tight .
Yet another option is an any seized compound such as park tool ac one , it provides a very durable and long lasting lubricant for the threads .
But if you have nothing else , at least use some grease .
A good technique is to put the preparation inside the shell and spread it around that way .
When you thread the cup in the excess doesn't back up against the cup and make a mess .
Install spaces on the new cup .
If applicable , taking note how the bottom bracket came apart .
The following is for threaded through spindle bottom brackets commonly used with two piece cranks .
The cups may be marked L and R for left and right side of bike .
You may also find directional arrows indicating which way to turn by hand , begin to thread in the drive side cup .
Remembering it is a left hand thread carefully counter clockwise until you are sure there is no cross threading to manufacture specification using a tore .
This can be between 24 50 Newton meters .
If using a hand wrench , use perceived effort for a wrench held at 20 centimeters from the bottom bracket .
Apply about 18 kg of effort .
Insert any internal sleeve install spacers as applicable to the non drive side cup , put it clockwise and secure to the same torque as the drive side for cartridge bottom brackets integrated with the spindle note the thread direction , some but not all models will have the left and right side markings .
These refer to the side of the bike , not thread direction , install the bottom bracket with the flange side .
First .
In this example , the flange is on the right , which is the drive side , use car to install the spindle straight and not to cross thread the bottom bracket if it feels hard to turn or seems off in any way , have a look at the opposite side .
Here , you can see the spindle is not centered in the shell , meaning it is cross threaded , remove realign and try again .
Once you are sure it's going in straight , you can use the tool to secure this side .
Typical torque is 25 to 30 Newton meters .
Consult the manufacturer .
If in doubt if using a hand wrench , use perceived effort for a wrench held at 20 centimeters from the Bonner bracket .
Apply about 14 kg of force .
repeat the process on the other side , reinstall the cranks share a playlist for more information on your specific crank .
Thanks for watching this repair health video from Park Tool .
We're constantly adding videos and articles here on youtube as well as our website at park tool dot com .
Please give this video a thumbs up if it helped you out and of course , subscribe for the latest content from Park Tool .