The Shimano PD-6700[paid link] Ultegra pedals are renowned for their reliability, efficient power transfer, and smooth engagement. However, like any mechanical component, they can develop issues such as noise, stiffness, or reduced rotation smoothness over time. These symptoms often arise from contamination, worn bearings, or improper torque settings. This guide explains how to diagnose, repair, and maintain your PD-6700[paid link] pedals to restore smooth and silent performance.
Tools Required
- 8 mm hex wrench
- 17 mm pedal wrench[paid link] (optional, depending on crank type)
- 7 mm and 10 mm sockets
- Small flathead screwdriver
- Grease (Shimano or equivalent)
- Cleaning rag and degreaser
- Torque wrench[paid link] (recommended)
Understanding the Shimano PD-6700 Pedal System
The PD-6700 Ultegra pedals use a sealed cartridge bearing system combined with adjustable cup-and-cone bearings. This hybrid design ensures a balance between low friction and long-term durability. Over time, however, dust and moisture can penetrate the seals, causing stiffness or noise when pedaling.
The cleat engagement system also relies on spring tension and proper lubrication. Without maintenance, these contact points may creak, click, or feel overly tight during clipping in and out.
Diagnosing Noise and Stiffness
Before attempting disassembly, it’s essential to determine where the issue originates. Not every noise or stiffness problem comes from the pedal itself.
Checking for Source of Noise
- Inspect the cleats: Worn or unevenly installed cleats can cause clicking sounds during pedaling. Ensure they are tight and aligned properly.
- Examine crank arm torque: Loose pedals often create creaking noises at the interface. Tighten the pedal axle to the manufacturer’s recommended torque (35–55 Nm).
- Spin the pedal by hand: If the rotation feels rough or tight, the internal bearings may need servicing.
- Check for lateral play: Hold the pedal body and try to move it side to side. Any noticeable movement indicates worn bearings or insufficient preload.
Identifying Bearing Issues
If the pedal feels gritty or makes grinding noises when rotated by hand, the cartridge bearings or cone assembly are likely contaminated or dry. A stiff pedal typically indicates over-tightened bearing preload or dried grease inside the spindle.
Disassembling the PD-6700 Pedal
Proper disassembly is key to safely diagnosing internal issues.
- Remove the pedal from the crank arm using an 8 mm hex wrench.
- Use a 10 mm socket to remove the lock nut from the spindle end.
- Carefully lift off the dust cap and note the bearing orientation.
- Slide out the axle assembly, keeping track of bearing positions.
- Inspect the bearings, cups, and cones for rust, pitting, or wear.
If the grease appears discolored or contaminated, clean all components thoroughly using degreaser and a soft cloth. Avoid using harsh solvents that may damage the seals.
Servicing and Lubricating Bearings
The PD-6700 pedals use a combination of ball bearings and a sealed bearing cartridge. Proper lubrication restores smoothness and prevents metal-on-metal contact.
- Apply fresh grease evenly into the bearing cups and along the spindle.
- Reinstall the ball bearings carefully using tweezers if necessary.
- Reinsert the axle into the pedal body and tighten the cone nut until resistance is felt, then back off slightly to ensure free rotation.
- Secure the lock nut firmly to prevent loosening during rides.
After reassembly, the pedal should rotate smoothly with minimal resistance but no side play.
Addressing Noisy Cleat Engagement
Sometimes, stiffness or creaking noises come from the cleat engagement mechanism rather than the bearings. To fix this:
- Clean the binding area thoroughly to remove debris and old grease.
- Apply a small amount of dry PTFE lubricant to the contact points.
- Check the spring tension adjustment screw (located at the back of the pedal). Loosen slightly if engagement feels excessively tight.
Ensure both pedals have equal tension to maintain consistent clipping behavior.
Common Causes of Persistent Noise
If noise remains after servicing, the issue may lie elsewhere. Consider these possibilities:
- Crank arm threads contaminated with grit or insufficient grease.
- Loose bottom bracket transmitting vibration into the pedal area.
- Worn cleats causing poor interface contact with the binding mechanism.
- Cracked pedal body (rare but possible after crashes or heavy use).
Careful inspection of the full drivetrain system ensures that no external factors are overlooked.
Testing After Maintenance
After servicing, reinstall the pedals and test rotation and engagement manually. The movement should feel smooth with consistent resistance across both pedals. During a short ride, listen for any clicking, grinding, or squeaking sounds.
If stiffness persists, the bearing preload may still be too tight. Reopen the pedal and back off the cone slightly, ensuring there’s no lateral movement when fully tightened.
Preventing Future Noise and Stiffness
Regular maintenance significantly extends the life of your Shimano PD-6700 pedals. Follow these preventive measures:
- Re-grease the bearings every 3,000–5,000 km, depending on riding conditions.
- Keep the cleats clean and replace them once the contact points become rounded.
- Periodically check spring tension and equalize both sides.
- Apply fresh grease on the pedal threads before installation to prevent seizing.
Consistent upkeep not only prevents stiffness and noise but also ensures efficient power transfer and a secure feel during rides.
Conclusion
Noisy or stiff Shimano PD-6700 pedals are almost always the result of neglected lubrication, contaminated bearings, or incorrect preload adjustment. With the right tools and careful maintenance, you can restore the pedals to their original smoothness and quiet performance. Regular servicing and inspection will help your PD-6700 pedals deliver the reliability and efficiency they’re designed for—ride after ride.