Replacement bearings designed for use with TKM Micro Wheel Assemblies.

These bearings are used across the Micro K'nex Train System.

📦 Bearing Size

• S685 — 3×8×4mm

🚂 Compatibility

Compatible with:

• TKM Micro Train System

Not compatible with:

• TKM K'nex V3 Train System
• HD Wheel Assemblies 

🔧 Performance

Hybrid ceramic bearings are recommended for the smoothest operation and lowest rolling resistance.

⚠️ Pack Sizes

• 12 Bearings = Middle Train System
• 24 Bearings = Front Train System
• 36 bearings = 2 Car Train
• 48 bearings = 3 Car Train
• 60 bearings = 4 Car Train
• 72 bearings = 5 Car Train
• 84 bearings = 6 Car Train
• 96 bearings = 7 Car Train

⚠️ Important Information

• Bearings are sold separately from train systems
• Please ensure you select the correct quantity for your setup
• Train systems and wheel assemblies not included
• Depending on stock levels bearings may take 1-2 weeks to ship