The Shimano Deore XT Di2 SW-M8150-R is an electronic right shift switch built for e-MTB riders who demand precise, effortless gear changes on the trail. Designed for Shimano EP8 (EP801) motor systems, it delivers instant rear derailleur response with a light, short-stroke action — even over rough, technical terrain. If you're building or upgrading a high-performance e-MTB drivetrain, this is the control interface at the heart of it.

Highlights

• Short-stroke electronic actuation: A gentle touch triggers instant gear changes — no cable fatigue, no contamination, no guesswork on the trail.
• Three customisable buttons: Each of the three switches supports multiple input and hold functions, all configurable via Shimano's E-TUBE PROJECT app.
• Adjustable paddle position: Individually reposition each paddle to match your hand size and riding style for a natural, confident feel.
• AUTO SHIFT compatibility: A dedicated mode button lets you toggle between AUTO SHIFT and manual shifting on the fly, directly from the bars.
• Clamp band mounting: Standard 22.2 mm clamp band fixes securely to your handlebar without requiring a dedicated I-SPEC EV brake lever — ideal for flat-bar builds.
• EW-SD300 wired connection: Single SD300 port connects directly into the Di2 system via Shimano's reliable wired e-tube architecture.
• E-TUBE PROJECT upgradeable: Firmware is field-updatable, and shifting input and multi-shift settings are fully customisable through the Shimano E-TUBE PROJECT app.

Electronic Shifting for E-MTB

Unlike mechanical shifters, the SW-M8150-R requires no cable tension management or barrel adjusting. The Di2 system self-adjusts and maintains precise indexing across the cassette. Combined with the Deore XT RD-M8150 rear derailleur, gear changes are accurate and consistent regardless of conditions — mud, dust, or steep inclines included. Power is drawn from the main Shimano STEPS battery, so there's no separate switch battery to monitor.

Customise Your Shifting

Using the E-TUBE PROJECT app (via Bluetooth or wired connection), you can remap each button's function to suit your preferred riding style. Set up multi-shift sequences, assign the AUTO SHIFT toggle, or configure hold-input functions. Every rider's setup can be dialled in differently — useful whether you're a trail rider who wants smooth automatic cadence management or an enduro racer who prefers total manual control.

Compatibility & Fit

The SW-M8150-R is compatible with Shimano EP801 and EP8 e-bike motor systems. It works with the Deore XT Di2 RD-M8150 rear derailleur (12-speed), as well as Shimano Cues RD-U6070 Di2 (10/11-speed) and RD-U6050. Mounting is via 22.2 mm handlebar clamp band (no I-SPEC EV brake lever required). Connects via EW-SD300 wired e-tube cable (sold separately). Not compatible with standard (non-motor) MTB Di2 or wireless XTR Di2 systems.