Thömus

Lightrider E Ultimate 2024

Discontinued✎Lightweight · Cross-CountryLegacy · 1.1/10iFreshness 1.1/10
How current the bike is — newer chassis, motor and battery score higher. 10 = brand-new, 0 = legacy.

Motor

Maxon BIKEDRIVE AIR · 40Nm · 280W↗

Battery

Maxon 250Wh integrated

Travel F/R

140/130mm

Wheels

29F / 29R✎

Frame

Full carbon✎

Weight

14.8 kg✎

Price

£0✎

View the Thömus Lightrider E Ultimate on Thömus’s site

Thömus Lightrider E Ultimate 2024

The Lightrider E Ultimate is Thömus's lightweight cross-country and trail eMTB, built around an Ultra High Modulus carbon frame and developed in partnership with fellow Swiss firm maxon. Thömus claims a complete-bike weight of under 15kg, which it pitches as the lightest full-suspension e-mountain bike in the world, riding so close to an unassisted bike that it is hard to tell apart visually.Drive comes from the maxon BIKEDRIVE AIR system. At just 3.5kg it is a featherweight by motor standards, with 250W nominal power, peaks of over 300W and 40Nm of peak torque, plus a freewheel design that lets assistance fade in and out naturally. The integrated battery is offered in 250Wh or 350Wh, and a 250Wh range extender can be fitted as a second pack for longer days.Suspension is modest by trail-bike standards, with around 130mm at the rear paired with a front fork that can be specced from cross-country to trail duty. Geometry is offered in three banded sizes (XS/S, M/L, L/XL) across two fork setups: the shorter Cross Country configuration runs a 66.5 to 66.6 degree head angle, while the longer fork option slackens this to 65.5 degrees and lowers the bottom bracket drop, trading a touch of climbing position for more composure on descents. The XS option makes the platform unusually accessible to smaller and lighter riders.As a bespoke Swiss build-to-order bike, the Lightrider E Ultimate was sold through Thömus's online configurator from a base price of CHF 6'290, with the finishing kit chosen by the buyer rather than fixed into named trims. The model has since been discontinued.

EMTB Forums verdict

The Lightrider E Ultimate is Thömus's lightweight cross-country and trail eMTB, built around an Ultra High Modulus carbon frame and developed in partnership with fellow Swiss firm maxon. Thömus claims a complete-bike weight of under 15kg, which it pitches as the lightest full-suspension e-mountain bike in the world, riding so close to an unassisted bike that it is hard to tell apart visually.

Drive comes from the maxon BIKEDRIVE AIR system. At just 3.5kg it is a featherweight by motor standards, with 250W nominal power, peaks of over 300W and 40Nm of peak torque, plus a freewheel design that lets assistance fade in and out naturally. The integrated battery is offered in 250Wh or 350Wh, and a 250Wh range extender can be fitted as a second pack for longer days.

Suspension is modest by trail-bike standards, with around 130mm at the rear paired with a front fork that can be specced from cross-country to trail duty. Geometry is offered in three banded sizes (XS/S, M/L, L/XL) across two fork setups: the shorter Cross Country configuration runs a 66.5 to 66.6 degree head angle, while the longer fork option slackens this to 65.5 degrees and lowers the bottom bracket drop, trading a touch of climbing position for more composure on descents. The XS option makes the platform unusually accessible to smaller and lighter riders.

As a bespoke Swiss build-to-order bike, the Lightrider E Ultimate was sold through Thömus's online configurator from a base price of CHF 6'290, with the finishing kit chosen by the buyer rather than fixed into named trims. The model has since been discontinued.

Geometry read

What the numbers mean on the trail

Computed from this bike's geometry, spec and build kit — reach, wheelbase, chainstay, head and seat angles, travel, motor, weight and the fork/tyre/brake spec — and worked out per size, because a fixed chainstay can make an S and an XL feel very different.

Size

Setting

Descending

A solid all-round descender (65.5° head angle, 130mm) — capable in the rough and steep without being an all-out bruiser.

Playfulness

Short 444mm rear and a lighter build — easy to pop, manual and throw around.

Size balance

Not enough geometry on record to judge size balance.

Technical climbing

A workmanlike climber — expect to put in more rider effort on the steep stuff. 280W of peak power and 40Nm of torque.

Best suited toPlayful trail riding — jumps, pumps and tight, techy singletrack.

Easy to throw around; happiest when you're active on the bike.

Watch out forClimbing leans on the rider more than the motor.

Lower torque or a slacker seat angle — fine, just don't expect a winch.

How it stacks up vs other Lightweight · Cross-Country bikes (from 63 bikes in the database)

Weight14.8 kg3.8 kg lighter than average

Battery250 Wh185 Wh below average

Motor torque40 Nm19 Nm below average

⚙️ Adjustable geometry: this frame has a high/low setting — low drops the BB and slackens the head angle for more descending stability; high lifts the BB and steepens slightly for clearance and a perkier, more playful feel.

Computed from geometry + spec, not a paid review. Scores are guidance, not gospel.

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Geometry · hover a row to highlight the measurement on the bike

Flip-chip position

geometry changes with the chip

	L/XL	M/L	XS/S
Reach	500 mm	466 mm	431 mm
Stack	628 mm	615 mm	601 mm
Seattube	450 mm	420 mm	390 mm
Chainstay	445 mm	444 mm	445 mm
Headtube Angle	66.5°	66.5°	66.6°
Seattube Angle (eff)	72°	73°	73.1°
Headtube	125 mm	110 mm	95 mm

Trims · 1

	Base £0
Motor	Maxon BIKEDRIVE AIR · 40 Nm
Battery	Maxon 250Wh integrated · 250 Wh
Travel F/R	140/130 mm
Frame	Ultra High Modulus Carbon
Weight	14.8 kg
Price	£0

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