Truvativ 9 Speed Steel 64mm BCD
Truvativ

Truvativ 9 Speed Steel 64mm BCD

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Robust Truvativ 24-tooth steel inner chainring engineered for 9-speed MTB triple cranksets. 64mm BCD, 4-bolt fit and SRAM-compatible for reliable shifting and long wear.

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Product Details

Overview & Materials — Durable 24T Steel Inner for 9-Speed Triples

Truvativ's 24T inner chainring (Part #11.6215.066.000, Product No. 390168) is a direct-fit replacement for 9-speed mountain triple cranksets using a 64mm BCD and 4 chainring bolts. Built in a compact 24-tooth size, this inner ring prioritizes durability and predictable chain retention for trail riders, commuters or anyone running a triple drivetrain. The ring is constructed from hard-wearing steel with a black finish that resists nicks and abrasion better than lightweight aluminum alternatives. It ships light and compact (5" x 5" x 0.1", 0.14 lb) and carries the SRAM model ID CR-MLEG-64-A1 for cross-referencing compatibility with SRAM/Truvativ systems.

Technology & Shifting Behavior — How It Works on the Trail

This inner chainring is designed to integrate with common triple-chainring systems: the middle and outer rings in compatible sets come with shift ramps and profiles to facilitate smooth front shifts. While the inner ring focuses on strength and tooth geometry for reliable chain pickup and retention, the whole set (inner+middle+outer) provides crisp transitions under load. Steel construction delivers real-world benefits: it resists gouging from rock strikes, wears progressively (letting you run it longer), and is an economical option for riders who prioritize reliability over grams. The 64mm BCD and 4-bolt pattern maintain a stable mounting interface to your crank spider for consistent chainline and shifting performance.

Fit & Compatibility — What Cranks and Systems It Works With

Fit notes: 64mm BCD, 4-bolt pattern, 24T inner ring sized for MTB triple cranksets. Compatible with 9-speed chains and designed as an inner position ring. Works with Truvativ and many SRAM-compatible triple crank spiders matching the 64mm BCD spec; check your crank's BCD measurement before ordering. It carries the SRAM Model ID CR-MLEG-64-A1 — use that reference to verify compatibility with existing middle/outer rings and chainline setups. Not intended for single-ring narrow-wide drivetrains or modern direct-mount 1x cranksets without confirming fit and spacing.

Who This Chainring Is For — Riders & Use Cases

This chainring suits mountain riders running 9-speed triple drivetrains who want a tough, cost-effective replacement part. It's ideal for trail riders, entry-level or budget builds, commuter MTBs, and anyone who values longevity over ultra-low weight — especially if you regularly ride in rocky or abrasive conditions where steel's durability matters. Mechanics and home wrenchers will appreciate the straightforward 4-bolt install and the clear SRAM cross-reference number for ordering matching rings. If you are converting to 1x drivetrains or require a lightweight race setup, consider alternative aluminum or direct-mount options tailored to that goal.

Key Features

  • ✓ 24-tooth inner chainring designed for 9-speed MTB triple drivetrains
  • ✓ 64mm BCD, 4-bolt mounting for secure fit to Truvativ/SRAM crank spiders
  • ✓ Durable steel construction resists rock strikes and abrasions
  • ✓ SRAM model ID CR-MLEG-64-A1 for easy compatibility checks
  • ✓ Black finished surface minimizes corrosion and blends with cranksets
  • ✓ Compact, lightweight shipping size — quick, affordable replacement part
  • ✓ Optimized tooth profile for reliable chain retention and smooth shifts

Specifications

BCD 64
Chainring Bolts 4
Teeth 24
Material Steel
Position Inner
Primary Color Black

Product Identifiers

Vendor Item # 11.6215.066.000
UPC 710845411120

Frequently Asked Questions

Will this chainring fit my crankset?

This ring fits cranksets that use a 64mm BCD with a 4-bolt pattern and accept a 24T inner ring. Verify your crank spider's BCD measurement and bolt pattern; the SRAM model ID CR-MLEG-64-A1 can help confirm compatibility with Truvativ/SRAM systems.

Is this chainring compatible with 10- or 11-speed chains?

It's designed for 9-speed drivetrains. While a 10-speed chain may physically fit, shifting performance and chainwear characteristics can differ—using rings matched to your chain speed is recommended for best shifting and longevity.

Does the inner ring include shift ramps and pins?

The product notes indicate that middle and outer rings in the set come with shift ramps. This inner ring is optimized for strength and tooth geometry; it is intended to work with ramped middle/outer rings in a compatible triple setup rather than relying on inner-ring ramps.

How hard is it to install this ring?

Installation is straightforward for any mechanic comfortable removing a crank and swapping chainrings. Use the correct torque for your chainring bolts, ensure the ring is oriented correctly as the inner position, and re-check chainline and shifting after reinstalling the crank.

Why choose steel over aluminum chainrings?

Steel sacrifices some weight for significantly greater abrasion resistance and impact durability. For riders who encounter rocks, roots or heavy use, steel rings last longer and tolerate damage better than thin aluminum rings, making them economical for tough trail conditions.

Can I use this ring for single-ring conversions?

Not recommended without confirming chainline and bolt-circle compatibility. Single-ring (1x) setups usually use narrow-wide rings or direct-mount components specifically engineered for chain retention. This inner ring is intended for triple setups and standard chain retention strategies.

Buying Guide

When selecting a replacement inner chainring, prioritize matching BCD, bolt pattern, and drivetrain speed. For 9-speed triple setups, a 64mm BCD 4-bolt ring is the standard spec; staying with the same tooth count preserves gearing and front derailleur trim. Choose steel if you ride rocky trails, carry loads, or want a low-cost, long-lasting option. If weight and race performance are critical, look for aluminum or specialty lightweight rings—but expect shorter service life in aggressive conditions.

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