SRAM X-Sync 40T 110mm - 11.6218.015.001
SRAM

SRAM X-Sync 40T 110mm - 11.6218.015.001

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SRAM X-Sync 40T narrow-wide outer chainring for 11-speed drivetrains. CNC aluminum, 110 BCD 5-bolt fit delivers secure chain retention and lightweight stiffness for gravel and mixed-surface riding.

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Product Details

Overview & Technology

SRAM's X-Sync 40T (11.6218.015.001) is an 11-speed outer chainring engineered for reliable chain control and low weight. The ring uses SRAM's proven X-Sync narrow-wide tooth profile to trap the chain on every revolution, cutting chain drops and noise—ideal for aggressive gravel, cyclocross, and 1x conversions on 110 BCD cranks. This ring is CNC-machined from aluminum for a high stiffness-to-weight ratio and finished in a corrosion-resistant grey. The 5-bolt, 110mm BCD pattern maintains compatibility with a wide range of compact and gravel cranksets while keeping overall system weight low (shipping weight ~0.3 lb).

Key Features

Built for retention and durability: The narrow-wide X-Sync tooth profile alternates thin and thick teeth to match the inner/outer links of an 11-speed chain, improving retention without a chain guide. Precision machining and anodized finish resist wear and road grime. • Narrow-wide profile: Reduces chain drops and improves pedalstroke confidence. • 110 BCD, 5-bolt: Broad compatibility with compact/gravel cranks. • CNC aluminum construction: Lightweight, stiff, and corrosion-resistant finish.

Fit & Compatibility

This chainring is specified for 11-speed drivetrains and sized at 40 teeth with a 110mm bolt circle diameter (BCD) and 5-bolt pattern. It is intended as an outer chainring and matches SRAM X-Sync crank interfaces and many aftermarket 110 BCD crank arms—confirm your crank's BCD before purchase. While optimized for 11-speed chains, the narrow-wide profile often works with neighboring speeds (10/11) in practice, but pairing with an 11-speed SRAM chain and correct chainline will deliver the best performance. This is a bolt-on ring, not a direct-mount design—use the correct length bolts and 8–12 Nm torque range when installing.

Who It's For

This SRAM X-Sync 40T chainring is ideal for gravel riders converting to a 1x setup, racers who want more secure chain retention, and cyclists running compact cranks who need a taller outer cog. It suits riders who value a lightweight, noise-free drivetrain and prefer the simplicity of narrow-wide retention over additional guides. Choose this ring if you ride mixed terrain, need a 40T gearing option on a 110 BCD crank, and want the proven reliability of SRAM's X-Sync system in an aluminum, bolt-on package.

Key Features

  • ✓ X-Sync narrow-wide tooth profile prevents chain drops on rough terrain
  • ✓ CNC-machined aluminum construction for high stiffness and light weight
  • ✓ 110mm BCD, 5-bolt pattern fits many compact and gravel cranks
  • ✓ Optimized for 11-speed chains; works best with SRAM 11-speed systems
  • ✓ 40-tooth sizing ideal for gravel and mixed-surface 1x setups
  • ✓ Anodized grey finish resists corrosion and road abrasion

Specifications

Narrow-Wide Design Yes
BCD 110
Chainring Bolts 5
Chainring Comp. X-Sync
Teeth 40
Material Aluminum
Position Outer
Primary Color Grey
Speed 11

Product Identifiers

Vendor Item # 11.6218.015.001
UPC 710845750601

Frequently Asked Questions

Is this chainring compatible with my crank?

This is a 110mm BCD, 5-bolt outer chainring — it fits cranks that use a 110 BCD bolt pattern. Check your crank documentation or measure bolt-to-bolt center distances to confirm BCD compatibility before ordering.

Can I use this with 10- or 12-speed chains?

The ring is designed for 11-speed drivetrains; in many setups it will work acceptably with 10-speed chains, but optimal retention and shifting are achieved with an 11-speed chain. Using 12-speed chains is not recommended as spacing and link thickness differ.

What torque should I use for the chainring bolts?

Use the crank manufacturer's recommended torque when installing. A general guideline for 5-bolt chainring bolts is 8–12 Nm. Use new washers/bolts if needed and apply a threadlocker per crankmaker instructions where specified.

Can I run this ring as a single-ring (1x) setup without a chain guide?

Yes—thanks to the narrow-wide tooth profile, many riders run the X-Sync 40T as a single-ring setup without a guide. For extreme conditions or very rough terrain, pairing with a dedicated chain retention device adds extra security.

What material and finish does the ring use?

The ring is CNC-machined from aluminum with an anodized grey finish to increase surface hardness and corrosion resistance while keeping weight low.

Does this ring come with bolts?

This product is the chainring only. Chainring bolts are typically sold separately—check your crankset for included hardware or add compatible 5-bolt chainring bolts to your order.

Buying Guide

When choosing a replacement or upgrade chainring, match the bolt circle diameter (110 BCD), bolt count, and intended speed (11-speed) to your crank and chain. Decide on tooth count based on terrain and cadence: 40T is a versatile choice for gravel and mixed-surface rides, offering a good balance of top speed and climbing ability. Prefer narrow-wide profiles for 1x reliability—these reduce the need for heavy chain guides while improving chain retention. Look for CNC-machined aluminum rings for a blend of light weight and stiffness; if you ride in especially abrasive conditions, consider hardened or steel options for longer wear life.

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