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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

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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

      funride 

      7 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: http://www.amazon.com/Shimano-Deore-M591-ATB-Crank...

    • profile image

      clipless pedals 

      7 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

      juan 

      9 years ago

      We are Legitimate registered Company under licensed number(RC55724).We shipvia UPS, and your ordered items will get to your door step within 48hrs(Two Working Day).We sell all kinds Cannondale, Cervelo, Ellsworth,Giant, Jamis, Klein, Kona, Litespeed, Rocky Mountain, Santa Cruz,Specialized, Trek, Gary Fisher bikes.EMAIL ADDRESS ; bike_inc@hotmail.combike_inc1@yahoo.comIF YOU DON'T SEE YOUR CHOICE HERE YOUR ASK FOR OUR FULL PRICE LIST OF THE BIKE.Here are some of our best offers:NEW Kona 2009 Stab Deluxe Bike $1,400NEW Kona 2009 Dawg Deluxe Bike $1,370NEW Kona 2009 Hei Hei 2-9 Bike $1,200NEW Kona 2009 Bass Bike $1,000NEW Kona 2009 Kula Deluxe Bike $1,100NEW 2008 CANNONDALE Rush Carbon 4 Bike $1,400NEW 2008 CANNONDALE Rush 6 Bike $1,200NEW 2007 Cannondale Six13 Team 1 Dura Ace Road Bike $2,000NEW 2008 CANNONDALE Moto 3 Carbon Bike $1,900New 2010 Trek Madone 6.9 Bike ....$3500usdNew 2010 Trek Madone 6.9 WSD Bike ....$3500usdNew 2010 Trek Madone 6.5 Bike .....$2500usdNew 2010 Trek Madone 6.5 WSD...... $2500usdNew 2010 Trek Madone 6 series........$4000usdNew 2010 Trek Madone 5 series........$3800usdNEW Trek 2009 Madone 6.5 Bike #2,100NEW Trek 2009 Madone 6.5 Pro Bike $2,200NEW Trek 2009 Session 88 DH Bike $2,104NEW Trek 2009 Session 88 FR Bike $2,201NEW Trek 2009 EX9 Bike $1,900NEW Trek 2009 EX8 Bike $1,500NEW GT 2009 Zaskar Pro Bike $1,201NEW GT 2009 Force 2 Bike $1,100NEW GT 2009 Zaskar Expert Bike $1,000NEW GT 2009 Force 3 Bike $1,010NEW Orange 2009 224-Evo World Cup Bike $3,000NEW Orange 2009 Five SE Bike $2,300NEW Orange 2009 224-Evo Race Bike $2,100NEW Orange 2009 ST4 SE Bike $2,000NEWspecialized enduro 2009 bike......$1500usdNEW 2007 Specialized Epic Marathon Mountain Bike $1,400NEW 2007 Specialized Roubaix Pro Road Bike $1,500NEW 2007 Specialized Ruby Pro Road Bike $1,450NEW 2008 GARY FISHER HiFi Pro Bike $1,800NEW 2008 GARY FISHER Supercaliber Bike $1,550NEW 2008 GARY FISHER HiFi Deluxe Bike $1,600NEW 2007 Giant Anthem 1 Mountain Bike $1,200NEW 2007 Giant Reign X0 Mountain Bike $1,800NEW 2007 Giant Tcr Composite 1 Road Bike $1,500NEW 2007 Santa Cruz Blur LT Mountain Bike $2,400NEW 2007 Santa Cruz Nomad Mountain Bike $2,000NEW 2007 Santa Cruz V 10 Mountain Bike $2,400..NEW 2008 WHYTE E-5 XT Bike $2000NEW 2008 WHYTE E-5 Works Bike $2,400NEW 2008 WHYTE E-120 XT Bike $2,500Cervelo R3 Dura-Ace 2008 Bike $2100usdCervelo RS Ultegra SL 2009 Bike $1200usdCervelo S1 2009 Bike ..$900usdAND MANY MANY ... MODELS AVAILABLE AT THIS SPECIAL PRICE.IF YOU ARE INTERESTED PLEASE REPLY US VIA MAIL.Contact Phone number +447024051968EMAIL ADDRESS ;bike_inc@hotmail.combike_inc1@yahoo.com

    • 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... you...do 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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