4.18mm Chainring Spacer Set Of 5 Aluminum Alloy CNC Machined For Precision Chainline And Retention Lightweight Aircraft Grade Spacers Between Spider And Inner Chainring For MTB And Road Bikes

4.18mm Aluminum Chainring Spacers - 5pc CNC Set
✔️ 5 aluminum spacers: outer 12.1mm, inner 8.05mm, 4.18mm thick

These spacers are CNC machined from aircraft-grade aluminum to ensure lightweight strength. They sit between the spider and inner chainring to fine-tune chainline and retention on MTB and road bikes.

✅ Set of 5 spacers
✅ 4.18mm thickness
✅ Outer diameter 12.1mm, inner diameter 8.05mm
✅ CNC machined from aircraft-grade aluminum
✅ Made in the USA for reliable performance

💡 What is the recommended approach to use a 4.18mm chainring spacer to correct chainline on frames with varying cassette positions while preserving chain retention?

Using spacers lets you dial in alignment for smoother shifts and better chain retention. - Aligns chainring offset with cassette for consistent chainline - Improves shifting by keeping the chain path straight across rings - Lightweight aircraft-grade aluminum spacer adds strength without weight gain