Thömus

Lightrider E Ultimate 2025

Current✎Lightweight · TrailAgeing · 4.1/10iFreshness 4.1/10
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 BIKEDRIVE AIR 250 · 250Wh

Travel F/R

140/140mm

Wheels

29F / 29R✎

Frame

Full carbon✎

Weight

14.6 kg✎

Price

£5,630✎

View the Thömus Lightrider E Ultimate on Thömus’s site

Thömus Lightrider E Ultimate 2025

From £5,630

The Thömus Lightrider E Ultimate is the Swiss brand's halo lightweight e-MTB, built around an Ultra High Modulus carbon frame and the maxon BIKEDRIVE AIR drive unit. With a claimed weight from 14.6 kg it is one of the lightest full-suspension electric mountain bikes available, and the headline draw is how little the assistance changes the ride: 40 Nm of peak torque and a 250 W motor peaking over 300 W give a subtle hand on climbs rather than full-power shove.This is a configurator bike rather than a range of fixed trims. You build it around Shimano SLX, XT or XTR drivetrains and brakes, and a Fox, Marzocchi or DT Swiss fork, so price and weight move with the spec you choose. Power comes from a frame-integrated 250 Wh battery, and the 3.5 kg drive unit lets maxon hide the battery inside the down tube so the bike looks almost indistinguishable from an unpowered Lightrider; an optional second 250 Wh battery roughly doubles the range when you need it.Geometry is firmly in cross-country and light-trail territory. In the standard 140 mm setup the head angle sits at a steep 66.5 to 66.6 degrees with reach from 431 to 500 mm across the XS/S to L/XL sizes; fitting a 150 mm fork slackens that to 65.5 degrees and raises the front for more confident descending. The XS/S option and roughly 73 degree seat angle make it genuinely usable for smaller and lighter riders, which is rare in this class.

EMTB Forums verdict

The Thömus Lightrider E Ultimate is the Swiss brand's halo lightweight e-MTB, built around an Ultra High Modulus carbon frame and the maxon BIKEDRIVE AIR drive unit. With a claimed weight from 14.6 kg it is one of the lightest full-suspension electric mountain bikes available, and the headline draw is how little the assistance changes the ride: 40 Nm of peak torque and a 250 W motor peaking over 300 W give a subtle hand on climbs rather than full-power shove.

This is a configurator bike rather than a range of fixed trims. You build it around Shimano SLX, XT or XTR drivetrains and brakes, and a Fox, Marzocchi or DT Swiss fork, so price and weight move with the spec you choose. Power comes from a frame-integrated 250 Wh battery, and the 3.5 kg drive unit lets maxon hide the battery inside the down tube so the bike looks almost indistinguishable from an unpowered Lightrider; an optional second 250 Wh battery roughly doubles the range when you need it.

Geometry is firmly in cross-country and light-trail territory. In the standard 140 mm setup the head angle sits at a steep 66.5 to 66.6 degrees with reach from 431 to 500 mm across the XS/S to L/XL sizes; fitting a 150 mm fork slackens that to 65.5 degrees and raises the front for more confident descending. The XS/S option and roughly 73 degree seat angle make it genuinely usable for smaller and lighter riders, which is rare in this class.

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, 140mm) — 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 · Trail bikes (from 87 bikes in the database)

Weight14.6 kg4.3 kg lighter than average

Battery250 Wh184 Wh below average

Motor torque40 Nm17 Nm below average

Value for money59/100from £5,630 · comparable bikes ~£5,999

⚙️ 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.

Paste into any thread to embed this live, interactive panel.

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 £5,630
Motor	Maxon BIKEDRIVE AIR · 40 Nm
Battery	Maxon BIKEDRIVE AIR 250 · 250 Wh
Travel F/R	140/140 mm
Frame	Carbon
Fork	Customisable: Fox, Marzocchi or DT Swiss, 120-150 mm travel (140 mm standard)
Shock	DT Swiss R535 ONE rear shock, 120-140 mm travel (140 mm standard)
Stem	Thömus TIC, 60 mm
Handlebar	Thömus alloy flat handlebar, 720 mm
Saddle	Selle Italia X-Base, black
Seatpost	Dropper post, 150 mm (e.g. Shimano LEV-I)
Brakes	Hydraulic disc, Shimano (SLX / XT / XTR depending on configuration)
Rear derailleur	Shimano 1x12 (SLX / XT / XTR depending on configuration)
Crank	32T chainring
Shifters	Shimano 1x12 (SLX / XT / XTR depending on configuration)
Cassette	Shimano 10-51T, 12-speed
Chain	Shimano 12-speed
Drivetrain	Shimano 1x12 (SLX / XT / XTR depending on configuration); 32T chainring; Shimano 1x12 (SLX / XT / XTR depending on configuration); Shimano 10-51T, 12-speed; Shimano 12-speed
Wheels	29 inch (aluminium or carbon depending on configuration)
Tyres	Schwalbe Racing Ray / Racing Ralph 2.35 inch, tubeless
Weight	14.6 kg
Price	£5,630

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