SRAM 39T 120mm GXP Alloy - 11.6215.188.260
39T 120mm GXP Alloy - 11.6215.188.260
SRAM

SRAM 39T 120mm GXP Alloy - 11.6215.188.260

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Lightweight CNC-style aluminum 39T outer chainring for SRAM GXP L‑pin 2x10 drivetrains. 4‑bolt, 120mm BCD and 10‑speed specific for crisp shifting and reliable durability.

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Product Details

Overview & Technology

SRAM's 39T 120mm GXP Alloy chainring is built as an exact replacement or upgrade for L‑pin GXP 2x10 setups. Finished in black aluminum, this outer ring is optimized for 10‑speed chains and precise indexing on compact 26/39 crank combinations. The 4‑bolt, 120mm BCD layout keeps compatibility with legacy GXP road/cyclocross crank arms that accept a 39T outer. Precision machining and tooth profiling ensure consistent engagement with 10‑speed chains and predictable shift performance under load. The ring's L‑pin ramp-and-pin compatible profile is tuned to help the front derailleur lift and seat the chain quickly and reliably in muddy, wet cyclocross conditions or rough gravel terrain.

Key Features

Materials & construction: Crafted from lightweight aluminum and finished in matte black, the ring is made for strength without excess mass. The manufacturing process uses precision machining to keep tooth accuracy high and ensure long service life with minimal wear. • 39 teeth for a lower outer gear suited to technical, steep or stop‑start riding. • 120mm BCD, 4‑bolt pattern — direct swap for compatible GXP cranks. • Optimized for 10‑speed chains and L‑pin GXP ramp/pin shifting.

Fit & Compatibility

This chainring is specifically designed for SRAM L‑pin GXP 2x10 systems and requires a crank with a 120mm BCD, 4‑bolt bolt circle. It is an outer ring intended to be paired with an inner ring such as a 26T in the corresponding 26/39 compact combination. Compatible with 10‑speed SRAM chains and most 10‑speed Shimano chains, but we recommend pairing like‑for‑like (10‑speed componentry) to preserve shifting performance. Always verify your crank's BCD and bolt count before purchase; the ring ships in a compact 7.2" x 7.1" x 0.7" package and weighs approximately 0.25 lb.

Who This Is For

If you race cyclocross, ride mixed gravel loops, or maintain older SRAM GXP 2x10 bikes, this ring is a practical replacement or low‑weight upgrade. The 39T outer is ideal for riders who want a lower top gear for steep, technical courses and frequent accelerations. It also suits workshop mechanics and home wrenchers refreshing worn chainrings on period correct GXP cranksets—offering reliable shifting, straightforward fitment and proven SRAM compatibility.

Key Features

  • ✓ 4‑bolt 120mm BCD fits L‑pin GXP 2x10 cranksets
  • ✓ Precision‑machined aluminum for low weight and durability
  • ✓ 39T outer ring tuned for technical cyclocross and gravel
  • ✓ Optimized tooth profile for crisp 10‑speed shifting
  • ✓ Black finish to match modern SRAM crank aesthetics
  • ✓ Compact packaging — light 0.25 lb shipping weight

Specifications

BCD 120
Chainring Bolts 4
Chainring Comp. L-pin GXP 2x10
Teeth 39
Material Aluminum
Position Outer
Primary Color Black
Speed 10

Product Identifiers

Vendor Item # 11.6215.188.260
UPC 710845660610

Frequently Asked Questions

Is this chainring compatible with my crank?

This ring fits cranksets that use a 120mm BCD and a 4‑bolt pattern and are designed for SRAM L‑pin GXP 2x10 setups. Confirm your crank's BCD and that it uses the L‑pin outer ring interface before ordering.

Can I use this with 11‑speed chains?

The ring is engineered for 10‑speed chains and shifting geometry. While an 11‑speed chain might physically fit, mixing speeds can compromise shifting performance and increase wear; we recommend using a 10‑speed chain for best results.

Does it include chainring bolts?

This SKU is the outer chainring only and does not include chainring bolts. If your bolts are worn or corroded, replace them with appropriate 4‑bolt hardware sized to your crank—Forest Bikes lists compatible bolt kits on the product page.

How long will the ring last?

Lifespan depends on riding conditions, chain maintenance and chain life. With a properly maintained, non‑stretched 10‑speed chain and regular cleaning, aluminum rings give many hundreds to thousands of kilometers of reliable service before noticeable wear.

What torque should I use for installation?

Follow your crank manufacturer’s torque recommendations—typically in the 8–12 Nm range for chainring bolts. If you’re unsure, consult SRAM's service documents or a professional mechanic to avoid over‑ or under‑tightening.

Can I mix this ring with a different inner ring?

You can pair it with compatible 26T inner rings that match the same BCD and L‑pin shifting profile. For optimal front shifting, match chainring spacing and tooth ramps/holes designed for GXP 2x10 systems.

Buying Guide

When replacing or upgrading chainrings for GXP 2x10 systems, first confirm bolt circle diameter (BCD) and the number of bolts on your crank—this SRAM ring requires a 120mm, 4‑bolt interface. Choose tooth counts that match your riding style: a 39T outer gives a lower top gear useful for steep cyclocross or mixed terrain, while pairing with the correct inner ring (commonly 26T in 26/39 setups) preserves shift geometry. Material and tooth profiling are important: aluminum is lightweight and durable for the outer ring, and ramp/pin profiles tuned for L‑pin GXP ensure smooth front shifts. Replace chainrings together with worn chains and consider fresh chainring bolts to avoid installation issues and maximize part life.

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