Head to head

Sigma MXVSUltra Bee

Comparing 2 of 3

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Altis · 2027

Sigma MX

21″ front wheel swap(est.)

Sur-Ron · 2026

Ultra Bee

21″ front wheel swap(est.)

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Summary

Claimed figures · blanks excluded

Most peak power: Sigma MX25 kW
Biggest battery: Ultra Bee4,440 Wh
Lowest price (USD): Sigma MX$5,299

Measured against each other

Peak power

Δ 0.5 kW

Sigma MX25 kW
Ultra Bee24.5 kW

Power-to-weight

Sigma MX—
Ultra Bee277 W/kg

Battery capacity

Δ 1,038 Wh

Sigma MX3,402 Wh
Ultra Bee4,440 Wh

Weight

Sigma MX—
Ultra Bee195 lb88.5 kg

Shorter is lighter.

Front travel

Sigma MX220 mm
Ultra Bee—

Rear travel

Sigma MX—
Ultra Bee—

Size & stance

To scale, lined up at the rear axle. Rims shown without tires. Hover a bike below to isolate it.

Full specifications

Price

PricePrices move. Check the date and currency.

$5,299

$6,499

Motor & performance

Peak powerPeak, not continuous. It's a burst number that brands measure in different ways.

25 kW34 hp

24.5 kW33 hp

Rated powerWhat the motor can sustain. Closer to what you feel on a long climb.

—

Power-to-weightCalculated by Mesa Project from claimed peak power and claimed weight.

—

277 W/kgCALC

Torque (as published)Brands quote torque at the motor or at the rear wheel. Read the note before comparing.

688 Nm507 lb-ft

511 Nm377 lb-ft

Top speed

65 mph105 km/h

Battery & charging

Battery capacityWatt-hours is the fuel-tank number. Volts × amp-hours.

3,402 Wh3.4 kWh

4,440 Wh4.44 kWhCALC

Pack voltage

97.2 V

74 V

Pack amp-hours

35 Ah

60 Ah

Swappable batteryA rider-removable pack that can be replaced with a compatible spare. Does not imply tool-free removal or compatibility across models.

—

Yes

Range claimBrands test at different steady speeds, so we don't crown a winner. Trail range will be lower.

—

70 mi113 km

Charge time

2 h

2.5 h

Chassis

WeightWhat you'll be lifting out of a rut. Check whether the battery is included.

—

195 lb88.5 kg88.5 kg195 lb

Seat heightUnladen. Sag brings it down once you sit on it.

889 mm35 in

909 mm35.8 in

Ground clearance

330 mm13 in

315 mm12.4 in

Wheelbase

1,300 mm51.2 in

1,379 mm54.3 in

Frame

—

Suspension

Fork

Adjustable dual-spring off-road suspension

Inverted fork, adjustable

Front travel

220 mm8.7 in

—

Shock

—

Air shock, adjustable

Rear travel

—

Wheels & brakes

Front wheel

19″

19″CALC

Rear wheel

16″

18″CALC

Front tire

70/100-19

80/100-19

Rear tire

90/100-16

100/90-18

Front brake

—

Rear brake

—

Electronics

Ride modes

Eco · Normal · Sport · Race

—

Regen braking

5 selectable levels

—

Display

TFT with NFC and key ignition

LCD Display

Ownership

Warranty

—

1 Year Factory Warranty

Highlighted = best among these bikes, where “best” is clear-cut. Range claims and torque are never ranked, because brands measure them differently.