Replacement and upgrade bearings designed for use with TKM Micro Wheel Assemblies.

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

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📦 Bearing Size

• S685 — 3×8×4mm

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🚂 Compatibility

Compatible with:

• TKM Micro Train System

Not compatible with:

• TKM K'nex Train System
• HD Wheel Assemblies 

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🔧 Performance

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

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⚠️ 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

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⚠️ 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