Introduction

This replacement involves removing the crank arm in order to access the chainring you are trying to replace.

Image 1/1:
  • Remove the cap covering the crank arm using the 6mm Allen Key

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Image 1/2: Slightly tighten it with an adjustable wrench. Image 2/2: Slightly tighten it with an adjustable wrench.
  • Screw the larger diameter threads on the crank puller into the hole you removed the cap from.

  • Slightly tighten it with an adjustable wrench.

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Image 1/3: The crank puller works by locking into the threads on the arm and pushing against the Isis drive axle to pry the arm and gears off. Make sure you are using the correct size crank puller, otherwise this step will not work. Image 2/3: During reassembly, add some grease to the axle to make it easier to remove the arm in the future. Image 3/3: During reassembly, add some grease to the axle to make it easier to remove the arm in the future.
  • Tighten the handle on the crank puller until the arm and gears slide off of the axle.

  • The crank puller works by locking into the threads on the arm and pushing against the Isis drive axle to pry the arm and gears off. Make sure you are using the correct size crank puller, otherwise this step will not work.

  • During reassembly, add some grease to the axle to make it easier to remove the arm in the future.

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Image 1/3: When reinstalling, apply a loctite thread compound on the threads to keep them from loosening as you ride. Also, make sure the writing on the new chainring faces the frame of the bike. Image 2/3: This chainring has a bolt circle diameter of 64 mm (BCD 64) and 22 teeth; however, you can replace it with any chainring with a BCD of 64. Image 3/3: This chainring has a bolt circle diameter of 64 mm (BCD 64) and 22 teeth; however, you can replace it with any chainring with a BCD of 64.
  • Remove the four 6mm hex bolts from the small chainring using the 6mm hex screwdriver. This will allow you to remove the chainring.

  • When reinstalling, apply a loctite thread compound on the threads to keep them from loosening as you ride. Also, make sure the writing on the new chainring faces the frame of the bike.

  • This chainring has a bolt circle diameter of 64 mm (BCD 64) and 22 teeth; however, you can replace it with any chainring with a BCD of 64.

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Conclusion

To reassemble your device, follow these instructions in reverse order.

Scott Kaufman

Member since: 04/20/2015

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Cal Poly, Team 15-2, Amido Spring 2015 Member of Cal Poly, Team 15-2, Amido Spring 2015

CPSU-AMIDO-S15S15G2

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