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How to Assemble a Mountain Bike (MTB) - Bottom Bracket and Crank set

Updated on April 18, 2017

Chapter 2 - Bottom Bracket and Crankset

This hub belongs to a series of hubs about How to Assemble a Mountain Bike.

Now that the headset and the suspension fork are mounted and before assembling the handlebar and all the commands lets take care of the bottom bracket and crankset and assemble them into place.

First thing to do it is to clean and remove any dirt from the screw thread on the frame. This is very important to avoid ruin the bottom bracket thread.

The next explanation will only apply when using Shimano® cranksets or other equivalent.

Then start by screwing the right side bottom bracket bearing on the frame after having greased it very well.

To be able to tighten the bottom bracket it is needed another tool (it varies with the kind of bottom bracket you are using).

Repeat the process for the left side bracket and then insert the crankset axis through the bottom brackets after greasing it.

Now it`s time to assemble the left crank arm on the axis and fasten the bolt which will assure that the crank arm is into place.

In the end it is recommended to use a torque wrench to tighten the crank arm to the axis with the exact strength (this values are indicated by manufacturer).

Assembling the bottom bracket and the crankset

Click thumbnail to view full-size
Insert the right sided bottom bracket and tighten itGreasing the left sided bottom bracketStarting to screw the bottom bracketTightening the bottom bracketGreasing the crankset axisInserting the crankset axis into placeAssembling the crankset left armScrewing the crank arm boltTightening the crank arm boltUsing a Torque Wrench to tighten the crank arm
Insert the right sided bottom bracket and tighten it
Insert the right sided bottom bracket and tighten it
Greasing the left sided bottom bracket
Greasing the left sided bottom bracket
Starting to screw the bottom bracket
Starting to screw the bottom bracket
Tightening the bottom bracket
Tightening the bottom bracket
Greasing the crankset axis
Greasing the crankset axis
Inserting the crankset axis into place
Inserting the crankset axis into place
Assembling the crankset left arm
Assembling the crankset left arm
Screwing the crank arm bolt
Screwing the crank arm bolt
Tightening the crank arm bolt
Tightening the crank arm bolt
Using a Torque Wrench to tighten the crank arm
Using a Torque Wrench to tighten the crank arm


If you got any doubts or you need some advise about Bottom Bracket or Crankset assembly you can use the comment box bellow or contact me through the Contact Author link.

How to assemble your mountain bike

Chapter 1 - Assembling the Headset and Suspension Fork;

Chapter 2 - Assembling the Bottom Bracket and Crankset;

Chapter 3 - Assembling the Handlebar and all the Commands;

Chapter 4 - Assembling the Brakes, Front and Rear Gears;

Chapter 5 - Assembling the Seat post and Saddle;

Chapter 6 - Assembling the Wheels and Tires.


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    • profile image


      8 years ago

      Hey clipless pedals, my advise is for you to change your crank set and get an integrated crank arm set from shimano. The Deore already comes with this system:

    • profile image

      clipless pedals 

      8 years ago

      Thanks so much for the write up. I have a shimano brand crank set, and whenever I stand up on the pedals, it makes a weird metal on metal sound, and then the crank comes lose. It definitely doesnt sound good...any ideas?

    • profile image


      9 years ago

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    • funride profile imageAUTHOR

      Ricardo Nunes 

      9 years ago from Portugal

      I don´t expect you to become mechanically skillful but I would love to hear that you have started to ride once again... You know, my wife Cláudia helps me a lot every time my hands don´t. Thankfully this happens less and less everyday even though I take much more time to finish things now but I did assemble this last one just by my self and it went great. I´m loving to ride my new bike... You`re such a sweet to go through all my new hubs, thank you so much, receive a big kiss from Portugal...

    • G-Ma Johnson profile image

      Merle Ann Johnson 

      9 years ago from NW in the land of the Free

      you... you... such a great job with your hubs and teaching how to do this Man's stuff...well maybe some woman know how to...but not this one...that's for sure...Kisses G-Ma :O) Hugs & Peace


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