Introduction

This guide covers the process of mounting the chainring to the crank arm. It does not cover removal or install of the crank to the bicycle - please reference your crank manufactures guidelines for those steps.

  1. Reference your crank mfg instructions for removing your crank and take the driveside arm off the bike. Lay out the crank with ring and tools on a clean workbench. Most 3-bolt cranks use mounting bolts with T25 torx heads but other sizes do exist. In this example, we are showing the T25 wrench for removal and a 1-20Nm torque wrench with T25 bit for install. Using the T25 wrench, or wrench appropriate to the chainring mounting bolts found on your cranks, remove the 3 bolts fully from the crank
    • Reference your crank mfg instructions for removing your crank and take the driveside arm off the bike.

    • Lay out the crank with ring and tools on a clean workbench. Most 3-bolt cranks use mounting bolts with T25 torx heads but other sizes do exist. In this example, we are showing the T25 wrench for removal and a 1-20Nm torque wrench with T25 bit for install.

    • Using the T25 wrench, or wrench appropriate to the chainring mounting bolts found on your cranks, remove the 3 bolts fully from the crank

    • You will now be able to remove the chainring from the crank arm.

  2. Clean and lightly grease 3-bolt chainring interface. Apply Loctite 242 or similar medium strength threadlocker to the threads of the fasteners. Install the chainring onto the crankarm and using the appropriate sized wrench, tighten the bolts snug in the order shown in image 3 of this step
    • Clean and lightly grease 3-bolt chainring interface.

    • Apply Loctite 242 or similar medium strength threadlocker to the threads of the fasteners.

    • Install the chainring onto the crankarm and using the appropriate sized wrench, tighten the bolts snug in the order shown in image 3 of this step

  3. Using a torque wrench, tighten the mounting bolts to 8-9 Nm or 71-80 in/lbs. This should be done in the same pattern as the bolts were snugged down in the last step. Reinstall and torque the crank arm per the manufactures specifications.
    • Using a torque wrench, tighten the mounting bolts to 8-9 Nm or 71-80 in/lbs. This should be done in the same pattern as the bolts were snugged down in the last step.

    • Reinstall and torque the crank arm per the manufactures specifications.

    • You're done....now get out and ride!

Conclusion

Thanks for reading, now get out there and ride!

Chris Costello

Member since: 12/07/2012

6 Guides authored

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