SRAM XX Eagle T-Type Bosch Direct Mount Chainring (32T / 34T / 36T)

The SRAM XX Eagle T-Type Bosch Direct Mount Chainring is designed specifically for modern Bosch-powered eMTBs running Eagle Transmission drivetrains.

This is SRAM’s highest-level Bosch-specific T-Type ring—built to handle the increased torque, chain load, and long-term wear demands that full-power eMTBs create. Rather than simply adapting a standard chainring, SRAM engineered this specifically around Bosch motor systems, creating what they describe as their most advanced e-bike specific ring.

The design uses a two-piece construction, pairing a robust steel tooth profile with a lightweight aluminium spider. This gives the durability needed for high-mileage eMTB use while keeping overall weight controlled. The aggressive T-Type tooth design improves chain retention, creates smoother power transfer, and helps reduce drivetrain wear over time.

It is designed for:

• Bosch CX Gen4 (BDU37)
• Bosch CX Gen5 (BDU38)

…and is fully compatible with Eagle Transmission systems using:

• GX Transmission
• Eagle 90
• X0 Transmission
• XX Transmission
• XX SL Transmission

Available in:

• 32T
• 34T
• 36T

This allows riders to properly tune climbing support, cadence, and top-end speed based on how and where they ride.

This is not a generic replacement ring—it’s a true performance drivetrain upgrade for serious eMTB builds.

Key Features

• Bosch-specific direct mount T-Type chainring
• Compatible with Bosch CX Gen4 (BDU37) and Gen5 (BDU38)
• Eagle Transmission / T-Type compatible
• Available in 32T / 34T / 36T
• Two-piece construction: steel teeth + aluminium spider
• Direct Mount (DM) interface
• 12-speed T-Type specific
• AeroGuard compatible and compliant with EN15194:2017
• Black / Black-Silver finish options
• Approx. weight: 185g (based on 36T)

Torque Collective Insight

This is the chainring we’d recommend for premium Bosch eMTB builds.

A lot of riders focus on cassettes and chains, but the front ring massively affects:

• drivetrain wear
• chain retention
• power delivery feel
• long-term reliability

On full-power eMTBs, that matters.

The XX T-Type ring is excellent because it combines:

• steel tooth durability
• lighter alloy structure
• proper T-Type compatibility
• Bosch-specific fitment

For most riders:

34T = best all-round option

It gives the best balance of:

• climbing support
• cadence efficiency
• trail speed

32T = steeper terrain / maximum climbing focus

36T = stronger riders / faster terrain

This is one of those upgrades riders often overlook—but it makes a real difference.

Compatibility

• Bosch CX Gen4 (BDU37)
• Bosch CX Gen5 (BDU38)
• Eagle Transmission / T-Type only

Important Note

This is for T-Type / Transmission only

It is not compatible with:

• older GX Eagle mechanical
• X01 Eagle
• XX1 Eagle
• standard non-T-Type Eagle drivetrains

That distinction matters.