Head to head

Ultra BeeVSSigma MX

Comparing 2 of 3

Show source notes

Sur-Ron · 2026

Ultra Bee

21″ front wheel swap(est.)

Altis · 2027

Sigma MX

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

Ultra Bee24.5 kW
Sigma MX25 kW

Power-to-weight

Ultra Bee277 W/kg
Sigma MX—

Battery capacity

Δ 1,038 Wh

Ultra Bee4,440 Wh
Sigma MX3,402 Wh

Weight

Ultra Bee195 lb88.5 kg
Sigma MX—

Shorter is lighter.

Front travel

Ultra Bee—
Sigma MX220 mm

Rear travel

Ultra Bee—
Sigma MX—

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.

$6,499

$5,299

Motor & performance

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

24.5 kW33 hp

25 kW34 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.

511 Nm377 lb-ft

688 Nm507 lb-ft

Top speed

65 mph105 km/h

Battery & charging

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

4,440 Wh4.44 kWhCALC

3,402 Wh3.4 kWh

Pack voltage

74 V

97.2 V

Pack amp-hours

60 Ah

35 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

2.5 h

2 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.

909 mm35.8 in

889 mm35 in

Ground clearance

315 mm12.4 in

330 mm13 in

Wheelbase

1,379 mm54.3 in

1,300 mm51.2 in

Frame

—

Suspension

Fork

Inverted fork, adjustable

Adjustable dual-spring off-road suspension

Front travel

—

220 mm8.7 in

Shock

Air shock, adjustable

—

Rear travel

—

Wheels & brakes

Front wheel

19″CALC

19″

Rear wheel

18″CALC

16″

Front tire

80/100-19

70/100-19

Rear tire

100/90-18

90/100-16

Front brake

—

Rear brake

—

Electronics

Ride modes

—

Eco · Normal · Sport · Race

Regen braking

—

5 selectable levels

Display

LCD Display

TFT with NFC and key ignition

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.