How to Replace Crankshaft Bearings on a Bicycle

Updated July 18, 2017

The crankshaft bearings allow the circular crank set to rotate as you pedal your bike forward. If you cycle on wet riding terrain, the bearings of the crank set may accumulate rust over time. This will gradually slow the bearings and cause your crank set to emit a squeaking sound. Replace the crankshaft bearings to improve the overall function of your bicycle.

Locate the cylindrical tube that has been connected to the base of your bicycle seat. Lift the seat tube into the fastening clamp of the bicycle repair stand. Lower the clamp lever to secure your bike to the repair stand. Rotate your bicycle pedals while shifting the chain to the lowest gear.

Remove the chain from the chain ring and wrap it around the bottom bracket. Locate the bolt found at the top of the right crank arm. Loosen the bolt using an Allen wrench. Rotate the external driver of the crank puller until it has been aligned with the external threads.

Align the external threads of the crank puller into the opening of the crank arm. Rotate the external driver in a clockwise motion to fasten the crank puller in position. Place the head of the adjustable wrench around the external driver of the crank puller. Fasten the head of the 16-mm wrench around the internal driver of the crank puller.

Hold the external driver in place while rotating the internal driver in a clockwise motion. Remove the crank set from the spindle of the bicycle frame. Repeat the procedure to detach the left crank arm. Loosen the lock ring with the corresponding wrench. Wrap the arms of the pin spanner around the bearing race.

Rotate the pin spanner in a counterclockwise motion to loosen the bearing race. Remove the spindle and bearing cages from the bicycle frame. Replace your old crank bearings with a new set. Insert the spindle back into the frame. Tighten the bearing race. Fasten the lock ring in place. Reattach the crank set and crank arms.

Things You'll Need

  • Bike repair stand
  • Allen wrench
  • Crank puller
  • Adjustable wrench
  • 16-mm wrench
  • Lock ring wrench
  • Pin spanner
  • Socket wrench
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About the Author

Philip Foster has been writing professionally since 2010. His work has been featured in the literary-arts magazine "The PEEL" and the weekly newspaper "The Mountain Xpress." Foster is an expert in various extreme sports. He cooked in a restaurant that offered organic and vegetarian cuisine for over three years. Foster received a Bachelor of Arts in creative writing from Appalachian State University.