SRAM Eagle 70 T-Type
Eagle 70 T-Type
SRAM

SRAM Eagle 70 T-Type

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The SRAM Eagle 70 T-Type is a 12-speed, UDH full-mount MTB rear derailleur engineered for durable, serviceable performance with a 52T max cog and replaceable wear parts.

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Product Details

SRAM Eagle 70 T-Type Overview & Technology

The Eagle 70 T-Type is a purpose-built 12-speed mountain bike rear derailleur designed to work with frames that use SRAM's UDH (Universal Derailleur Hanger) full-mount standard. It features a T-Type actuation ratio and SRAM Model ID RD-70-A1, providing a reliable mechanical platform for modern wide-range Eagle cassettes up to 52T. Construction and durability focus on serviceability: the Eagle 70 uses robust metal construction for the main body and cage assembly, hardened fasteners and replaceable skid plates and link components so you can repair instead of replace after crashes or wear. The unit ships in a compact package (8.1" x 8.1" x 3.6") and weighs approximately 1.5 lb.

Key Features and Real-World Benefits

Replaceable components for lower lifetime cost. The Eagle 70 T-Type accepts replaceable skid plates, outer parallelogram link, and cage or full cage assemblies so damaged parts can be swapped quickly at the trailhead or at your shop. That modularity reduces downtime after impacts and extends the life of the derailleur. New Drag Spring damper. SRAM's Drag Spring provides controlled chain damping and improved chain retention under pedaling loads and rough terrain. Combined with the T-Type actuation ratio, you get crisp, predictable shifts across a 10–52T cassette range and a total capacity of 42T.

Fit, Compatibility & Installation Notes

UDH Full Mount required. The Eagle 70 T-Type is a full-mount (UDH) derailleur — it will only install on frames built to the Universal Derailleur Hanger standard. It uses SRAM's T-Type actuation ratio and is intended for compatible SRAM 12-speed T-Type shifters and matching Eagle drivetrains. Key specs for fit: maximum cog 52T, minimum cog 10T, and total capacity 42T. Installation follows standard derailleur set-up: mount to a UDH hanger, set B-gap per SRAM guidance, index with a T-Type shifter, and confirm limit screws and pulley alignment. If your frame does not have UDH, you will need an adapter or a different derailleur model.

Who the Eagle 70 T-Type Is For

This derailleur is aimed at mountain bikers who value durability and serviceability—enduro, trail, and all-mountain riders who want a rebuildable, wide-range mechanical derailleur that tolerates crashes and heavy use. It's an excellent choice for riders upgrading from entry-level derailleurs who need a 10–52T cassette capacity with reliable chain control. If you race, ride aggressively on rough trails, or run heavy eMTB setups that use SRAM's T-Type actuation, the Eagle 70 provides a practical balance of performance, maintainability, and value without the premium price of top-tier models.

Key Features

  • ✓ UDH full-mount design for modern frames and secure mounting
  • ✓ T-Type actuation ratio optimized for SRAM 12-speed shifting systems
  • ✓ Works with cassettes up to 52T and total capacity of 42T
  • ✓ Replaceable skid plates, parallelogram link, and cage for trail repairs
  • ✓ New Drag Spring damper improves chain stability under load
  • ✓ Robust metal construction with hardened fasteners for durability
  • ✓ SRAM Model ID RD-70-A1 — serviceable, rebuildable derailleur
  • ✓ Compact shipping weight ~1.5 lb; ideal for heavy-use mountain setups

Specifications

Maximum Cog 52T
Minimum Cog 10T
Primary Color Black
RD Capacity 42T
Speed 12
Mount Full Mount (UDH)

Product Identifiers

Vendor Item # 00.7518.189.000
UPC 710845905100

Frequently Asked Questions

Is the Eagle 70 T-Type compatible with my frame?

The derailleur requires a UDH (Universal Derailleur Hanger) full-mount. If your frame uses UDH you're good to go; if not, you'll need an appropriate adapter or a different derailleur model that fits your hanger style.

Can I use this with any SRAM 12-speed shifter?

The Eagle 70 T-Type uses SRAM's T-Type actuation ratio and is intended to be paired with compatible T-Type 12-speed shifters. It may not index correctly with standard P-Type or non-T-Type shifters.

What cassettes and chainring sizes are supported?

This derailleur supports a cassette range from 10T minimum to 52T maximum and has a total chain capacity of 42T, so pair it with chainrings and cassettes that keep chain wrap within that capacity for reliable shifting.

Are replacement parts available for crashes or wear?

Yes — the Eagle 70 T-Type was designed for serviceability. Replaceable skid plates, the outer parallelogram link, and cage or cage assemblies are available so you can repair damaged components without replacing the entire derailleur.

Will the Drag Spring damper help on rough trails?

The Drag Spring adds controlled damping to the pulley cage, improving chain retention and reducing chain slap under pedaling and on rough terrain. It's especially beneficial for aggressive trail and enduro riding where chain stability matters.

Can I use this on an e-MTB?

Mechanically the Eagle 70 T-Type can be used on e-assisted mountain bikes if the bike has a UDH hanger and a compatible T-Type shifter, but check manufacturer guidance for eMTB-specific drivetrain recommendations and ensure components are rated for e-bike torque/load conditions.

Buying Guide

When choosing a mountain bike rear derailleur, consider mount type, actuation ratio, cassette compatibility, and serviceability. For modern wide-range 12-speed drivetrains you need a derailleur that supports up to the largest sprocket in your cassette (the Eagle 70 supports 52T) and has enough total capacity for your chainring and cassette combination. If you ride aggressively or in remote locations, prioritize a derailleur with replaceable parts and durable construction so you can repair damage instead of replacing the entire unit. Confirm your frame uses UDH and pair the Eagle 70 T-Type with compatible SRAM T-Type shifters and Eagle cassettes for the best results.

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