SRAM 42T Chainring - 11.6215.188.240
42T Chainring - 11.6215.188.240
SRAM

SRAM 42T Chainring - 11.6215.188.240

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Replacement SRAM 42T outer chainring for 10-speed GXP 2x10 drivetrains. BCD 120mm, 4-bolt aluminum construction in black for crisp shifting and low weight.

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Product Details

Overview & Technology

SRAM 42T Chainring (11.6215.188.240) is a purpose-built outer ring for 2x10 GXP cranksets that pairs with a 28T inner to deliver a classic road compact gearing. Its 120mm BCD and 4-bolt layout match standard GXP 2x10 set-ups, making it a direct replacement for worn rings or a simple upgrade for consistency and performance. The ring is made from lightweight aluminum with a precision-machined tooth profile optimized for 10-speed chains. The durable black finish protects the alloy from corrosion and wear while keeping weight down — the ring ships at roughly 0.2 lb. SRAM Model ID CR-MLEG-120-A1 and Manufacturer Part # 11.6215.188.240 identify the exact spec for fit and ordering.

Key Features & Real‑World Benefits

Precision tooth profile: The 42-tooth ring is profiled for smooth, reliable engagement with 10-speed chains to reduce chain drop and noisy shifting under load. Riders will notice cleaner front shifts and improved chain retention during hard accelerations or climbs. Lightweight aluminum construction: A low-mass outer ring keeps rotating weight down for snappier acceleration and lower inertia, while the robust alloy structure stands up to miles of road use. The black finish gives a clean, OEM appearance that blends with most cranksets.

Fit, Compatibility & Installation Notes

This chainring is designed specifically for L‑pin GXP 2x10 cranksets with a 120mm BCD and 4-bolt pattern. It is an outer chainring intended to run with compatible 28T inner rings (All 28/42 pairing) and standard 10-speed chains. Confirm your crank uses the L‑pin GXP interface and 120mm BCD before purchasing. Use the correct 4-bolt hardware and torque to manufacturer specs when installing. Because this ring follows SRAM's 10-speed tooth shaping, mixing it with worn or mismatched inner rings or a different-speed chain can reduce shifting quality — replace worn mates for best results.

Who This Chainring Is For

Road riders with legacy or current 2x10 GXP drivetrains who need a reliable replacement outer ring or want to restore crisp front shifting will appreciate this part. It’s ideal for commuters, club riders, and endurance cyclists running a 28/42 compact setup. Also useful for mechanics and restorers working on older 10-speed road bikes — the exact SRAM part number and 120mm BCD make sourcing and fitment predictable when refreshing a crankset.

Key Features

  • ✓ 42-tooth outer ring optimized for 10-speed chain engagement
  • ✓ 120mm BCD, 4-bolt pattern for direct GXP 2x10 fitment
  • ✓ Lightweight aluminum construction reduces rotating mass
  • ✓ Durable black finish for corrosion resistance and OEM look
  • ✓ Designed to pair with 28T inner for classic 28/42 compact gearing
  • ✓ SRAM Model ID CR-MLEG-120-A1, Mfg P/N 11.6215.188.240

Specifications

BCD 120
Chainring Bolts 4
Chainring Comp. L-pin GXP 2x10
Teeth 42
Material Aluminum
Position Outer
Primary Color Black
Speed 10

Product Identifiers

Vendor Item # 11.6215.188.240
UPC 710845660658

Frequently Asked Questions

Will this fit my SRAM GXP crankset?

Yes — this ring is designed for SRAM L‑pin GXP 2x10 cranksets with a 120mm BCD and 4-bolt pattern. Verify your crank uses the GXP L‑pin interface and 120mm bolt circle diameter before ordering.

Can I mix this 10-speed chainring with an 11-speed chain?

Mixing speeds is not recommended. This ring is profiled for 10-speed chains; using an 11-speed chain can lead to suboptimal shifting and increased wear. Match chain and chainring speed specifications for best results.

Is this an inner or outer chainring?

This is an outer chainring specifically made to run as the larger ring in a 2x10 setup (typically paired with a 28T inner). It uses the outer tooth profile and spacing required for smooth front shifts.

What chainring bolts do I need to install this?

Use 4-bolt chainring hardware compatible with your crank spider. If your existing bolts are worn or seized, replace them with quality stainless steel or alloy bolts sized for a 120mm BCD 4-bolt pattern. Always follow manufacturer torque guidelines.

How long will the chainring last?

Service life depends on riding conditions, maintenance, and chain wear. Regularly checking chain stretch and replacing the chain before it becomes excessively worn will extend the ring's lifespan. Under normal road use, expect many hundreds to thousands of miles before replacement is needed.

Is the black finish anodized?

SRAM supplies this ring with a durable black finish for corrosion resistance and appearance. Specific finish treatment isn't critical for fit, but avoid abrasive cleaning methods to preserve the surface.

Buying Guide

When buying a replacement chainring, first confirm the bolt circle diameter (BCD), bolt count, and crank interface. This SRAM 42T is a 120mm BCD 4-bolt outer ring made for L‑pin GXP 2x10 cranks — a precise match matters more than brand alone for shift performance. Also consider the mating inner ring and chain wear: installing a new outer ring alongside a worn inner ring or stretched chain will reduce shifting quality and shorten component life. If you're refreshing a drivetrain, replace chain and worn inner ring at the same time.

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