The MTB crankset is a key component of your bike’s drivetrain. Constantly under pressure, it may wear out over time or accumulate dirt and play, making it necessary to remove or replace. In this guide, we’ll walk you through how to remove an MTB crankset step by step, highlighting the key features and specifications, especially for popular models like the Shimano XT crankset.
Why remove your MTB crankset ?
There are several reasons why you might need to remove your crankset:
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Deep-clean the bottom bracket
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Change the crankset for performance or replacement
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Remove the MTB crank arm to check the bearings
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Replace the chainrings or grease the axle
Types of MTB cranksets
Before starting the crankset removal, it's important to identify the crankset type:
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Square taper cranksets: older standard, requires a crank puller
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ISIS or Octalink cranksets: splined interface, also needs a puller
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Hollowtech II cranksets (Shimano): integrated axle on the right arm, very common in modern MTBs
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SRAM DUB / GXP / Truvativ: proprietary systems requiring specific tools
Tools needed to remove an MTB crankset
The tools vary depending on your crankset type:
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Allen keys (usually 5 mm to 10 mm)
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Crank puller (for square taper or Octalink)
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Hollowtech II tool (for Shimano bottom brackets)
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Bike grease
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Clean rags
Step-by-Step: removing a Hollowtech II crankset (Shimano XT)
1. Remove the pedals
Start by removing the pedals with a wrench or Allen key. Turn them counterclockwise from the crankarm to unscrew.
2. Loosen the crank cap
Shimano XT cranksets have a plastic preload cap. Use the Shimano TL-FC16 tool to loosen and remove it.
3. Loosen the pinch bolts
On the left crank arm, loosen the two pinch bolts using a 5 mm Allen key.
4. Remove the left crank arm
Gently pull off the left crank arm once the bolts are fully loosened.
5. Slide out the axle and right crank arm
Slide the axle out toward the left side. The right arm (with the chainrings) will come out with it. You now have access to the bottom bracket.
6. Clean and inspect
Take this opportunity to inspect the bearings, clean the bottom bracket shell, grease the axle, and check the chainring teeth for wear.
Changing an MTB crankset: what to watch out for
When you decide to change your MTB crankset, make sure:
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The axle diameter matches your bottom bracket (e.g., 24 mm, DUB, GXP...)
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The bottom bracket type (threaded BSA, Press-Fit…) is compatible with your new crankset
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The chainline and speed compatibility fit your drivetrain (1x, 2x, or 3x systems)
In summary
Removing an MTB crankset is straightforward with the right tools and a method tailored to your specific crankset. Whether you’re performing a basic clean-up, a Shimano XT crankset removal, or planning to change the entire MTB crankset, just follow the steps outlined above to avoid mistakes.
Need replacement parts? Check out our range of crank arms, bottom brackets, chainrings, and crankset tools available in our online store.