Shimano EP8 vs EP801: What Changed in the Next-Gen STEPS Motor?

If you’re choosing between the original Shimano EP8 and the newer EP801, the decision comes down to how much you value refined power delivery, auto-shifting, and future-proofing. For aggressive trail riders who want natural-feeling assistance and don’t need electronic shifting, the EP8 still delivers at a lower price. For riders who want programmable profiles, smoother low-speed torque, and compatibility with Shimano’s Auto Shift system, the EP801 is the clear upgrade.

EP8 vs EP801: Side-by-Side Specs

Feature	Shimano EP8 (DU-EP800)	Shimano EP801 (DU-EP801)
Max torque	85 Nm	85 Nm
Peak power	250 W (nominal), ~500 W peak	250 W (nominal), ~600 W peak (unlocked)
Weight	2.6 kg (motor unit)	2.6 kg (motor unit)
Assist modes	3 (Eco, Trail, Boost) + Walk	4 (Eco, Trail, Boost, Fine-tune) + Walk
Custom profiles	None (fixed assistance curves)	Up to 10 custom profiles via E-TUBE app
Auto Shift	Not supported	Supported (with compatible Di2 rear derailleur)
Free Shift	Not supported	Supported (shift without pedaling)
Di2 integration	No	Yes (wired/wireless)
Thermal management	Basic	Improved heat sink and firmware
Sound	Noticeable gear whine	Quieter, smoother operation
Battery compatibility	All STEPS BT-series	All STEPS BT-series
Price (motor alone)	~$800–$1,000	~$1,100–$1,400

Both motors share the same mounting pattern and battery interface, so swapping an EP8 for an EP801 in an existing frame is mechanically straightforward – but you’ll need a new wiring harness and compatible display (SC-EM800 or SC-EN600) to unlock the full feature set.

Performance and Riding Feel

The EP8 was praised for its punchy, responsive Boost mode but criticized for being abrupt at low cadences. The EP801 addresses that: its new Fine-tune mode sits between Trail and Boost, giving a linear power curve that feels closer to a natural pedal stroke. On steep climbs with loose terrain, the EP801 lets you meter torque more precisely, reducing wheel spin.

Peak power hasn’t officially changed (85 Nm), but the EP801’s controller allows a slightly higher power ceiling (around 600W vs 500W) in certain firmware versions – mostly noticeable when accelerating from a stop on steep grades. In practice, the difference is small unless you’re regularly maxing out the motor on technical ascents.

The EP801 also runs quieter. Shimano swapped the planetary gear coating and added damping to the motor casing. Riders coming from a Brose or Bosch CX will still hear a whine, but it’s less intrusive than the EP8’s mix of gear noise and motor hum.

Trade-off to know: The EP801’s smoother power curve helps with traction, but some aggressive riders miss the EP8’s snappier, more responsive Boost mode. If you prefer a sharp surge when you stomp on the pedals, the EP8 still has an edge in raw feel – especially in Boost at high cadences.

Auto Shift, Free Shift, and Di2 Integration

The biggest practical upgrade on the EP801 is support for Auto Shift – the system automatically changes gears based on speed and cadence, using a Di2 rear derailleur. You can set it to shift automatically in Eco or Trail mode, or keep manual control in Boost. Free Shift lets you shift gears without pedaling (e.g., while coasting into a climb), reducing missed shifts and chain slap.

These features require:

• A Di2 rear derailleur (e.g., XT Di2 RD-M8150 or XTR Di2 RD-M9150)
• The SC-EM800 display with shift buttons
• A compatible e-bike frame with internal routing for the extra wires

Verification step for compatibility: Check your current display model. If it’s not an SC-EM800 or SC-EN600, you cannot access Auto Shift settings or custom profiles – the motor will run in default mode only. Also inspect your frame’s cable ports: if there is no dedicated routing for a third shift cable (beyond the motor-to-display wire), you will need to run an external cable, which can snag on trail debris.

Applicability boundary: Auto Shift and Free Shift only work when the EP801 is paired with a Di2 derailleur. If you plan to keep a mechanical drivetrain, the EP801 gains Fine-tune mode and quieter operation, but you lose the headline shifting features. The EP8 cannot be upgraded to support Auto Shift at all – the hardware simply lacks the necessary communication protocol.

Best-Fit Picks by Use Case

Trail / All-Mountain (aggressive, technical climbs) – EP801. The Fine-tune mode and smoother torque let you pick your line without overshooting. If you also ride park, the quieter motor is a bonus on lift-access descents.

Cross-Country / Marathon – EP801 if you can afford it; the weight is the same, and Auto Shift reduces fatigue over long days. The EP8 is still a solid budget option if you’re okay with manual shifting.

Enduro / Freeride – EP8. You want raw Boost power and don’t need custom profiles. The $300–$400 savings can go toward suspension upgrades or a bigger battery.

Commuter / Utility – EP801 makes sense if you value predictable assistance and want to let Auto Shift handle gear changes. For a basic cargo bike, the EP8 works fine.

Trade-offs to Know

• Cost of upgrading an existing bike: Swapping an EP8 for an EP801 to get Auto Shift can top $1,500 when you factor in the motor, harness, display, Di2 derailleur, and labor. If your frame lacks internal routing for the extra wires, you’ll have to run cables externally – which looks unfinished and can get caught during transport or maintenance. In that case, buying a new bike with the EP801 already installed is often cheaper than retrofitting.
• Peak power difference is firmware-dependent: The ~600W peak on the EP801 is only available with the latest firmware (check Shimano’s E-TUBE app). Some early EP801 units shipped with a locked power ceiling; you may need a dealer to unlock it. The EP8’s peak is consistent but lower.
• Thermal management is better, not perfect: The EP801’s improved heat sink and firmware reduce thermal throttling on long climbs in hot weather, but it can still cut power after 20+ minutes of sustained boost on a 90°F day. If you live in a desert climate or ride big alpine ascents, neither motor is immune to overheating.

Related Questions

Can I convert my EP8 bike to EP801 without changing the frame?
Yes. The motor bolt pattern, battery connector, and cable ports are identical. You will need the EP801 motor, a new wiring harness (EW-EN100 or EW-SD50), and a compatible display (SC-EM800). Budget around $1,200–$1,500 for parts, plus labor if you’re not doing it yourself.

Does the EP801 work with all existing Shimano STEPS batteries?
Yes. Any BT-series battery (e.g., BT-E8035, BT-E8036, BT-E8010) is compatible. No firmware update needed.

Which is better for snow or very cold weather?
Both motors perform similarly in cold conditions. The EP801’s improved thermal management helps in hot weather but doesn’t affect cold start behavior. Keep batteries warm before riding in sub-freezing temps.

Is the EP801 heavier than the EP8?
No. Both weigh 2.6 kg (motor only). The weight difference comes from the additional wiring and Di2 components if you install Auto Shift.

Do I need a special display to use custom profiles on the EP801?
Any STEPS SC-EM800 or SC-EN600 display works. The E-TUBE app (iOS/Android) lets you adjust up to 10 custom profiles, then sync them to the motor via Bluetooth. The display itself can switch between profiles.

Explore This Topic

• Back to Motor and Power Output
• Back to E-Bike Motor Comparisons

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