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How to Assemble a Mountain Bike - Bottom Bracket and Crankset

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By funride

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.



Assembling the bottom bracket and the crankset

Click thumbnail to view full-size
Insert the right sided bottom bracket and tighten it
Insert the right sided bottom bracket and tighten it


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 is time to assemble the left crank arm on the axis and fasten the bolt which will asure that the crank arm is into place.

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

Shimano XT PD-M770 Clipless Pedal Shimano XT PD-M770 Clipless Pedal
Shimano XT M770 clipless pedals. Shimano's first XT level clipless pedal.
Price: $86.00
List Price: $129.99

Park Polylube 1000 Grease Tube, 4oz Park Polylube 1000 Grease Tube, 4oz
Park Tool's poly-urea lubricant was developed specifically for bicycle maintenance and repair. PolyLube 1000 has an extremely high shear strength to protect vital parts under extreme conditions.
Price: $3.85
List Price: $3.70
Shimano Dura-Ace Special Bike Grease - 50g - Y04110000 Shimano Dura-Ace Special Bike Grease - 50g - Y04110000
Good for cables, pivots, and all other things that grease is good for.
Price: $9.49
List Price: $10.99
Pedro's Velo Grease Bicycle Grease (1lb/450g) Pedro's Velo Grease Bicycle Grease (1lb/450g)
All-purpose assembly grease. Highly resistant to water washout. Excellent anti-wear properties and superior anti-rust protection. Fresh vanilla scent.
Price: $13.99
Pedro's Syn Grease Bicycle Grease (1lb/450g) Pedro's Syn Grease Bicycle Grease (1lb/450g)
Synthetic formula with very high load and lubricity ratings. Ideal for bearing assemblies, cables, threads and most grease applications. White, non-staining formula is waterproof.
Price: $29.99
ACTION TOOL BOTTOM BRACKET SHIMANO TL-FC33 ACTION TOOL BOTTOM BRACKET SHIMANO TL-FC33
TOOL BOTTOM BRACKET SHIMANO TL-FC33 FITS NEW HOLLOWTECH 2 BB SOCKET 1/2 DRIVE
Price: $26.98
Shimano TL-FC16 Crank Arm Installation Tool Shimano TL-FC16 Crank Arm Installation Tool
Shimano TL-FC16 Crank Arm Installation Tool for Hollowtech II. Customers buy this item with Shimano TL-FC32 Crank Adaptor Tool by Shimano.
Price: $2.00
List Price: $3.99
Park Tool TW-1 Torque Wrench (1/4- Inch Drive, 0-60 inch Lbs) Park Tool TW-1 Torque Wrench (1/4- Inch Drive, 0-60 inch Lbs)
Make sure you tighten parts and accessories to their own torque specifications with this tough, accurate torque wrench. 1/4" drive. Ranges from 0-60 inch pounds (includes adjacent metric scale).
Price: $39.70
List Price: $56.99
BBB TorqueFix Wrench Set Bike Tool - 64017011/BTL-52 BBB TorqueFix Wrench Set Bike Tool - 64017011/BTL-52
Adjustable by twisting the grip. Built-in "Rattle" mechanism. Range: 4 - 24 Nm. Durable hard shell box contains: TorqueKey, Allen Keys 3,4,5,6,8 and 10mm. T25 Torque.
Price: $93.99
List Price: $109.99

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

Comments

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G-Ma Johnson profile image

G-Ma Johnson  says:
9 months ago

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

funride profile image

funride  says:
9 months ago

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...

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4 months ago

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