How to Replace or Service the Bearings in Your Shimano SM-SH12 Pedals

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The Shimano SM-SH12 pedals are an excellent choice for road cyclists seeking a reliable and durable pedal system. However, like any high-performance component, the bearings in these pedals can wear out over time. Regular maintenance and timely bearing replacement can ensure that your pedals continue to perform optimally, extending their lifespan and improving your cycling experience.

In this guide, we will walk you through the steps involved in replacing or servicing the bearings in your Shimano SM-SH12 pedals. Whether you’re an experienced mechanic or a cyclist looking to perform DIY maintenance, this article will provide you with all the necessary steps.

Tools Required

Before you begin, ensure you have the following tools:

  • Shimano pedal tool or 8mm Allen wrench[paid link]
  • Small flathead screwdriver or plastic pry tool
  • 3mm and 5mm Allen wrenches[paid link]
  • Torque wrench[paid link] (for reassembly)
  • Clean rags
  • Grease or lubrication suitable for pedals
  • Replacement bearings (specific to Shimano SM-SH12)

Step-by-Step Guide to Replacing or Servicing Bearings

Step 1: Remove the Pedals

The first step in servicing or replacing the bearings of your Shimano SM-SH12 pedals is to remove them from the bike. Use a Shimano pedal tool or an 8mm Allen wrench[paid link] to unscrew the pedals from the crank arms. Be sure to note that the left pedal is reverse threaded, so turn it clockwise to remove it, while the right pedal turns counterclockwise.

Step 2: Disassemble the Pedals

Once the pedals are removed from the bike, you can begin disassembling the pedal bodies. Use a 5mm Allen wrench to remove any screws securing the pedal body. Be careful not to strip the screws during removal, as these can be difficult to replace. Carefully pull apart the pedal body from the spindle, revealing the internal components, including the bearings.

Step 3: Inspect the Bearings

With the pedal body removed, you should now be able to inspect the bearings inside the pedal. The Shimano SM-SH12 pedals typically use sealed bearings that are designed to withstand dirt and water. However, over time, these bearings can wear out or become damaged.

Check the bearings for any signs of corrosion, pitting, or roughness when you rotate them. If the bearings feel rough or gritty, it’s time for a replacement. You can also check for any play or wobbling in the pedal spindle, which is another indication that the bearings are worn.

Step 4: Remove the Old Bearings

If you find that the bearings need replacing, use a small flathead screwdriver or a plastic pry tool to gently remove them from their housing. Be cautious not to damage the bearing seat or surrounding components during this step. If the bearings are particularly difficult to remove, you can also use a bearing puller, though this is rarely necessary for Shimano pedals.

Step 5: Install the New Bearings

Once the old bearings are removed, it’s time to install the new ones. Shimano provides replacement bearings specifically designed for the SM-SH12 model, so be sure to use these. Place the new bearings into their corresponding seats carefully. Ensure that they are seated evenly, with no gaps or misalignment, to prevent any issues when reassembling the pedal.

You may want to apply a small amount of grease to the bearing seats before installation to ensure smooth operation and to prevent corrosion in the future. Use a grease that is suitable for pedals and resistant to water ingress.

Step 6: Reassemble the Pedals

After installing the new bearings, reassemble the pedal body and spindle. Carefully align the pedal body with the spindle and secure it with the screws. Be sure not to overtighten the screws, as this can damage the threads or deform the pedal body. Use a torque wrench[paid link] to tighten the screws to the recommended specifications provided by Shimano (typically around 8-10 Nm).

Step 7: Test the Pedals

Once the pedals are reassembled, it’s time to test them. Rotate the pedals by hand to ensure that they spin smoothly without any roughness or play. If the pedals feel smooth and operate without any resistance or wobble, you’ve successfully replaced the bearings.

Step 8: Reinstall the Pedals on the Bike

With the pedals fully assembled and the bearings functioning properly, reinstall them onto the bike. Remember that the left pedal is reverse-threaded, so ensure you tighten it correctly to avoid damaging the threads. Use a torque wrench to tighten the pedals to the appropriate torque value, typically around 30-35 Nm for road bike pedals.

Maintenance Tips to Extend Bearing Life

  • Regular Cleaning: Keep your pedals clean to prevent dirt and debris from entering the bearings. After each ride, wipe down the pedals with a clean rag to remove any grit or grime that could affect performance.
  • Lubrication: Apply a thin layer of grease to the pedal threads and bearings periodically. This will reduce friction, protect against corrosion, and keep the bearings running smoothly.
  • Check for Play: Periodically check for any lateral movement or play in the pedal spindle. If you notice any, it may indicate bearing wear and necessitate servicing or replacement.
  • Seal Protection: Ensure that the seals around the bearings remain intact. Damaged seals can allow water and dirt to enter the bearing housing, accelerating wear.

Troubleshooting Common Bearing Issues

Even after replacing or servicing the bearings in your Shimano SM-SH12 pedals, you may encounter a few issues. Below are common problems and their solutions:

  • Pedals Feel Gritty: If the pedals feel gritty after bearing replacement, the bearings may not be fully seated, or there could be residual dirt in the housing. Disassemble the pedals again, clean all components thoroughly, and reassemble.
  • Pedals Have Play: If the pedals still exhibit play after servicing the bearings, it could indicate that the bearing race or spindle is worn. In this case, a complete replacement of the spindle or pedal body may be necessary.
  • Noise When Pedaling: Noise can often be traced back to improperly greased or misaligned bearings. Make sure that the bearings are adequately lubricated and that the pedal body is properly reassembled.

Conclusion

Replacing or servicing the bearings in your Shimano SM-SH12 pedals is a straightforward task that can significantly enhance the performance and longevity of your pedals. By following these steps carefully, you can maintain your pedals in top condition, ensuring smooth and efficient pedaling for years to come. Regular maintenance, such as cleaning and lubrication, will help prevent bearing wear and keep your Shimano SM-SH12 pedals running smoothly.