Crank arm sleeves (often used for repair or fitment adjustment) require a secure bond to resist pedaling forces, torque,and vibration. However, like other bicycle components, they often need to be removable for crank, pedal, or bottom bracket maintenance. This demands a retaining compound that offers secure, anti-vibration strength while allowing for future, non-destructive disassembly.
This is a Medium Strength, Serviceable application.
INCURE WeldLock™ 338 Retaining Compound (Yellow)
The INCURE WeldLock™ 338 Retaining Compound is the ideal functional “Medium Strength” solution. It is designed for assemblies where future disassembly is required, providing enough holding power to eliminate movement without making component removal a destructive process.
| Key Feature | Performance for Crank Arm Sleeves |
| Serviceable Bond (Yellow) | Specifically designed for assemblies requiring removal or repositioning. Locks the sleeve securely but allows for easier, non-destructive separation for maintenance. |
| Excellent Vibration Resistance | Provides reliable holding power against continuous pedaling forces, preventing the sleeve from shifting or generating creaking noises. |
| Gap Fill (Up to 0.25mm) | Effectively fills the annular space, compensating for minor tolerances and ensuring a solid, unified interface between the sleeve and the crank arm. |
| Temperature Resistance (150∘C) | Maintains integrity under standard cycling operational temperatures. |
Application Steps: Installing Crank Arm Sleeves
For optimal retention and reliable, yet removable, installation of crank arm sleeves, follow these steps:
1. Surface Preparation (The Foundation)
- Clean: Thoroughly clean both the crank arm bore and the sleeve’s outer surface. Surfaces must be absolutely free of all grease, oil, and contaminants. Use a cleaner (e.g., isopropyl alcohol or acetone) and wipe dry.
- Activate (If Needed): While usually not required, applying a chemical activator can ensure faster, more consistent curing, particularly in cold environments.
2. Product Application
- Apply: Apply a continuous, thin bead of WeldLock™ 338 around the full circumference of the outer surface of the sleeve near the press-fit area.
- Ensure Coverage: Ensure the adhesive completely wets the entire mating surface as the sleeve is inserted.
3. Assembly and Curing
- Assemble: Immediately slide or press the sleeve into the crank arm bore. Ensure the sleeve is fully seated and aligned correctly before the compound fixtures.
- Wipe Excess: Remove any excess adhesive visible outside the joint immediately after pressing.
- Cure: Allow the assembly to fixture before handling (typically 10-30 minutes). Allow a full 24 hours for the compound to reach maximum strength before riding the bicycle.