The Shimano PD-5800 pedals, part of the Shimano 105 groupset line, are known for their durable construction, reliable engagement, and efficient power transfer. However, over time, even well-built pedals can develop play, roughness, or noise in the bearings. Regular servicing or bearing replacement not only restores smooth rotation but also extends the overall lifespan of the pedals.
This guide provides a complete, step-by-step explanation of how to replace or service the bearings in your Shimano PD-5800 pedals. It covers the correct tools, procedures, common troubleshooting steps, and post-service checks to ensure optimal performance.
Tools Required
- 17 mm cone wrench[paid link]
- 7 mm hex wrench (for spindle removal)
- Small flathead screwdriver
- Shimano TL-PD40 pedal axle tool (recommended)
- High-quality bicycle grease
- Bearing ball set (3/32″ and 1/8″, depending on pedal side)
- Clean rags
- Torque wrench[paid link] (optional but recommended)
Understanding the PD-5800 Pedal Bearing System
The Shimano PD-5800 pedal uses a cup-and-cone bearing system, similar to Shimano’s higher-end SPD-SL designs. This traditional setup allows easy adjustment and servicing without needing to replace the entire spindle unit. Each pedal includes two sets of loose ball bearings — one at the inner cup and one at the outer cone — secured within a dust cap and spindle assembly.
Unlike sealed cartridge bearings, this configuration allows precise preload adjustment, providing a balance between smooth rotation and zero play. Regular cleaning and greasing prevent water ingress and bearing pitting, common issues in neglected pedals.
Step 1: Removing the Pedal Axle Assembly
Begin by cleaning the pedal surface thoroughly to prevent debris from entering the bearing area. Using the TL-PD40 tool, engage the dust cap on the pedal body and carefully turn counterclockwise to remove it.
Once the dust cap is removed, insert a 7 mm hex wrench into the end of the spindle and hold it steady. Using the 17 mm cone wrench[paid link], loosen the locknut located inside the pedal. Turn counterclockwise gently until the cone and locknut separate from the spindle.
Slide the entire spindle assembly out of the pedal body. Keep it level during removal to avoid spilling the loose bearings. Place the pedal body on a clean rag for inspection.
Step 2: Inspecting Bearings and Cups
Once disassembled, examine the inside of the pedal body for signs of wear or corrosion. Look closely at the bearing cups using a flashlight — any visible pitting, scoring, or discoloration indicates the need for replacement.
Clean all components with a degreaser and dry them thoroughly. Then, check the spindle and cone surfaces for wear. Minor roughness can often be smoothed with a light polish using fine steel wool, but deep scoring requires spindle replacement.
Step 3: Cleaning and Re-Greasing the Bearing Races
Before reassembly, clean the bearing races completely to remove all old grease and debris. Apply a generous amount of high-quality bicycle grease inside both bearing cups. This will help hold the new bearings in place and provide a protective layer against water intrusion.
Using a magnetic pick or tweezers, place each bearing ball back into its race. The PD-5800 typically uses 12 bearings on the inboard side and 11 bearings on the outboard side per pedal. Verify the count before closing the assembly, as missing even one ball can cause premature wear and imbalance.
Step 4: Reassembling the Spindle Unit
With the bearings greased and seated, carefully insert the spindle assembly back into the pedal body. Turn it slowly to ensure proper engagement and to prevent dislodging any bearing balls.
Once fully inserted, reinstall the cone onto the spindle, followed by the locknut. Hold the 7 mm hex wrench in position while tightening the 17 mm cone wrench until the rotation feels smooth but without lateral play. Over-tightening can cause binding, while under-tightening will lead to looseness during pedaling.
After adjustment, reinstall the dust cap using the TL-PD40 tool. Ensure the seal is snug but not cross-threaded.
Step 5: Checking Bearing Tension and Rotation
After reassembly, test the pedal by spinning it on the spindle. It should rotate freely with a light resistance from the fresh grease, but without grinding or wobble. If the pedal feels stiff, back off the cone slightly and retighten the locknut.
For a more precise setup, reinstall the pedal on the crank arm and check for any side play during pedaling. A well-serviced PD-5800 pedal should feel smooth and silent with no looseness or resistance fluctuations.
Common Issues During Bearing Servicing
1. Bearing Balls Falling Out During Reassembly:
This occurs if the grease isn’t applied thickly enough or the pedal is tilted excessively. Reapply grease to secure the balls before reinserting the spindle.
2. Persistent Play After Adjustment:
If side-to-side movement persists even after tightening, inspect the cone and spindle interface for wear. Worn threads or pitted cones will require replacement parts.
3. Rough Rotation After Servicing:
Excessive preload or misaligned bearing races can cause stiffness. Readjust the cone gradually until the rotation feels smooth and free.
4. Water Contamination Inside Pedal Body:
Water ingress is common in wet conditions. Consider using a waterproof grease and ensure the dust cap seal is tight after reassembly.
Optimizing Longevity and Performance
To maintain smooth operation, service the Shimano PD-5800 bearings every 3,000–5,000 km, depending on riding conditions. In wet or dusty environments, shorter intervals are ideal. Always clean the pedals after rides and avoid direct water jets aimed at the spindle area.
For enhanced longevity, consider using a high-viscosity synthetic grease, which offers superior resistance to washout and temperature variation. Periodic bearing checks prevent costly spindle damage and maintain the crisp engagement Shimano pedals are known for.
Comparison: PD-5800 vs. PD-R7000 Bearing Design
While both share similar servicing principles, the newer PD-R7000[paid link] features improved dust seals and tighter tolerances in the bearing cup design. However, the PD-5800 remains easier to disassemble and adjust manually, making it a preferred option for home mechanics seeking full control over bearing preload and feel.
For riders prioritizing low maintenance, the PD-R7000[paid link]’s slightly more sealed design offers better long-term protection. Conversely, for those who prefer regular hands-on upkeep, the PD-5800 provides superior adjustability and rebuild potential.
Final Checks
After bearing service or replacement, always verify that both pedals rotate evenly, without resistance differences between left and right sides. A consistent, smooth spin indicates correct bearing alignment and adequate lubrication.
If the pedal remains noisy or develops looseness soon after servicing, revisit the cone preload setting and confirm that the bearing races are seated correctly. Properly maintained Shimano PD-5800 pedals can perform like new for many seasons when serviced with care and precision.