Wheels MFG Middle Chainring Spacer (20pcs) Chainring spacer for middle position.Machined to close tolerances out of 6061 aluminum. Excellent for improving chain line, or for replacing missing spacers.SpecificationsInner Diameter: 10mmThickness: 0.6, 1.2, 2.0, 3.8mm $29.99 - $50.00