e SF 4.0 2026

The Sants e SF 4.0 is a full-carbon all-mountain eMTB built around the Mahle M40 motor -- 105 Nm of torque, a manufacturer-claimed peak of 850 W, and a rated 250 W -- paired with an 800 Wh battery and a multigear 29/27.5 mixed-wheel chassis running 160 mm up front and 150 mm at the rear. It is a serious, specification-forward machine at £6,790 entry price, and while no curated community data is yet available for this model, the numbers alone position it in the upper tier of all-mountain eMTBs.

Drive system and range

The Mahle M40 is a mid-drive unit weighing 2.5 kg, which is notably lighter than the heaviest full-power systems on the market. Its 105 Nm figure is strong for a motor in this weight class, and the claimed 850 W peak output puts it within touching distance of heavier full-power competition. The 250 W rated figure reflects European road-legal compliance rather than trail performance -- on technical climbs and sustained efforts, the peak output is what matters. The motor weight contributes to a relatively controlled total system mass: the Standard trim is listed at 24.5 kg, which is reasonable for a carbon all-mountain eMTB at this specification level.

The battery is quoted at 800 Wh, housed within the frame under the IM8 designation. At 800 Wh this is a generous capacity for a bike in this motor class, and real-world range will depend heavily on terrain, mode selection, and rider weight -- expect 40 to 80 km across mixed trail use as a broad category norm. No owner range data is yet verified for this specific model.

Geometry and handling

The 64° head angle is at the slack end of all-mountain convention, lending the e SF 4.0 a descending bias without crossing into full enduro territory. The reach progression runs from 430 mm (S) through 455 mm (M) and 485 mm (L) to 505 mm (XL) -- a 75 mm spread across four sizes that gives the geo team enough room to keep cockpit feel consistent rather than forcing riders into compromises at the extremes.

The 445 mm chainstay is fixed across all four sizes, which is a deliberate choice. A consistent short-to-mid chainstay keeps the front wheel light on climbs and maintains agility, though taller riders on XL may find the rear feel slightly more nervous at speed than on bikes with size-specific chainstay tuning. The 29-inch front with a 27.5-inch rear combination sharpens steering response and helps the front wheel roll through trail debris, a pairing that suits the 64° angle well on technical, rooty terrain.

Build and value

There are two trims. The base e SF 4.0 at £6,790 is specified with Fox 36/38 Factory Kashima forks and a Fox Float X Factory Kashima rear shock -- Factory Kashima at entry level is a genuine differentiator and typically requires no immediate suspension upgrade outlay. The Standard trim at £6,906 -- a £116 premium -- lists a complete bike weight of 24.5 kg but does not carry the same fork and shock callout in the available data, suggesting a build variance that buyers should clarify directly with Sants before ordering. The price delta is small enough that the Factory Kashima build should be the default consideration unless the Standard trim offers a specific component advantage not yet documented.

Community-verified strengths

No rider quotes are yet indexed for this model. As owner reports surface on the forum, verified strengths will be added here with direct attribution.

Caveats and known gripes

The 800 Wh battery is described as integrated, which is standard for this category but worth noting for long-term serviceability and replacement cost. Proprietary battery housings can complicate third-party repair options years down the line. The trim ladder documentation is currently sparse -- the fork specification (Fox 36 or 38) is listed as a range rather than a confirmed single unit, and buyers should press Sants for a definitive component build sheet before committing. No owner gripes are yet on record.

Verdict

The Sants e SF 4.0 suits a rider who wants a lightweight-leaning, carbon all-mountain eMTB with meaningful torque output, a large battery, and descending-oriented geometry, and who is comfortable paying a premium for Factory-level suspension included in the base price. At 24.5 kg it is competitive on weight, and the 64°/445 mm/multigear chassis is built for technical trails rather than fire-road cruising. Riders who need a verified owner community, an established service network, or a fully documented trim ladder should wait for more real-world data to accumulate before pulling the trigger. The bike is current production for 2026.