Motors · Shimano

Shimano · EP8 series RS variant (DU-EP801)

EP801 RS

Shimano's EP801 RS is the Orbea-exclusive 'Rider Synergy' tune of the full-size EP801: same 2.65 kg hardware, but software that lets the rider toggle between an efficient RS natural mode (54 Nm) and a full-fat RS+ climbing mode (85 Nm) - and the second-generation tune now hands over that full 85 Nm from as low as ~45 rpm. It is the motor that finally let the Orbea Rise blur the line between light and full-power eMTB.

Builds fast off idle - in RS+ it delivers the full 85 Nm from as low as ~45 rpm - plateaus broadly across the 60-90 rpm window at peak power, then falls away sharply above 110 rpm where it noticeably runs out of breath.

The verdict

Shimano EP801 RS is two motors in one firmware tune. For its first generation the Orbea EP8-RS was a deliberately softened drive, capped near 60 Nm and tuned to feel like a stronger rider rather than a winch; the current second-generation Rider Synergy tune replaces that with two cleanly defined modes - RS at 54 Nm for range and natural feel, and RS+ at the full 85 Nm for steep, technical climbing.

The Gen2 RS+ tune is the game-changer. Where the old RS asked for around 55 rpm before it would surrender its peak, the new tune pours the full 85 Nm in from as low as ~45 rpm - so on a pitch where you can only grind out a low cadence, it still digs deep. In RS+ the motor simply becomes a standard EP801, which Velomotion measured on the dyno at 562 W peak and 508 W at 100 W of rider input, so you get genuine full-power torque on tap, then dial back to 54 Nm to protect range.

The compromises are the EP801's compromises. It is one of the louder, more tonal motors in any group test - uphill it is roughly as loud as a Bosch Performance CX but lower in pitch, and it rattles audibly on descents. It also de-rates hard under sustained maximum load: hold it pinned and after about ten minutes it sheds output, settling toward its ~508 W sustained figure rather than the 562 W peak. But as a do-everything light-eMTB drive that can impersonate a full-power unit on demand, nothing else offers this trick.

“Two motors in one: a 54 Nm natural assist that becomes a full 85 Nm winch from just ~45 rpm the moment the trail turns vertical.”

Sustained power & heat

How long the headline number actually lasts under sustained climbing load.

Orbea 540 Wh

Holds 60% for 63 min

63 min of turbo assist / 1,386 m climbed in endurance testing at 150 W input, vs 71 min for a 750 Wh Bosch CX.

Character

Rider input

Shimano does not publish a fixed support ratio for the EP801, but it reaches maximum assist with very little rider effort - Velomotion measured full output at around 100-110 W of input (508 W out), the most eager of any motor in their test.

On the trail

In RS mode (54 Nm) it feels like a strong, supportive rider rather than a motor - smooth and progressive; flick to RS+ (85 Nm) and it transforms into an authoritative low-cadence winch, serving full torque from ~45 rpm for technical climbs.

Noise

No standardised lab dBA figure is published for the EP801, but reviewers consistently rate it among the loudest, most tonal e-MTB drives - uphill it is roughly as loud as a Bosch Performance CX though lower in pitch, with a distinct whine that shifts with cadence and an audible rattle on rough descents.

Efficiency

Frugal in natural mode: around 4.8 Wh/km on the flat rising to 34.2 Wh/km on sustained climbs, which is what lets the lightweight Rise post big-battery range from a small pack.

The case for and against

Strengths

Switchable 54-85 Nm tune - light RS feel or full RS+ power on demand
Full 85 Nm available from as low as ~45 rpm in RS+ mode
Velomotion-measured 562 W peak / 508 W at 100 W input in EP801 (RS+) form
Very low rider input needed for maximum assist
Light at 2.65 kg, enabling sub-20 kg light-eMTBs
Frugal 54 Nm RS mode unlocks big range from small batteries

Compromises

Loud, tonal running noise and audible descent rattle
De-rates from 562 W peak toward ~508 W sustained after ~10 min of full load
Power falls away sharply above 110 rpm
Full 85 Nm tune is Orbea-only, and needs a bigger battery to feed it

How it stacks up

In RS+ mode its 85 Nm and ~562 W peak sit right alongside the Bosch Performance CX (85 Nm / 600 W) and best the regular Shimano EP8. Against dedicated light-eMTB motors it is in a class of its own for headroom: the TQ-HPR50 (50 Nm), Specialized SL 1.2 (50 Nm) and Bosch SX (55 Nm) are all lighter and quieter, but in RS natural mode the EP801 RS matches their feathery 54 Nm character while keeping a full 85 Nm in reserve. The trade-offs are that it is heavier than those mini-motors, fades faster at very high cadence than a Bosch CX, and de-rates harder under sustained heat.

OWNER INTELLIGENCE

Most owners report no problems · 7,087 posts from 848 members analysed.

75Clutch rattle / clack when coasting over rough ground · typical onset: From new.

29Random cutouts / system shutdown mid-ride (no error logged) · typical onset: ~1,000 miles is the repeated figure; some cases from 500 miles or after a motor service.

26Water / wet-climate sensitivity (connector corrosion and internal moisture) · typical onset: Seasonal - failures cluster after winter or wet trips rather than at a mileage.

✓37,500 km on one EP8 (Orbea Rise) - owner repaired the roller clutch himself at 24,300 km with donor parts and kept going

Read the full owner report →

Sources: Velomotion - Shimano EP801 lab test (562 W / 508 W at 100 W) · Pinkbike - First Ride: 2025 Orbea Rise LT (RS 54 Nm / RS+ 85 Nm, full torque from 45 rpm) · Bike Perfect - 2nd-gen Orbea Rise / EP801 RS Gen2 tune · BIKE Magazin - Orbea EP8 RS endurance test (63 min / 1,386 m vs Bosch CX 750 Wh 71 min) · Shimano EP801 series (manufacturer).

Bikes running this motor · 11