TEZEUS

C8

TEZEUS C8

October 27, 2025

Photo credit: TEZEUS

TEZEUS is a Chinese brand that launched in late 2021. It took two years to move from concept to production before their first model, the C8 e-gravel bike, was released. Fueled by a successful Indiegogo crowdfunding campaign, the C8 is a true smart ebike featuring a minimalist, all-carbon design and thoughtful onboard technology.

The Tezeus C8 boasts a sophisticated configuration (battery, display, motor), was presented at CES 2024, and recently received a Red Dot 2025 award for its design and technology.

A successful Indiegogo campaign provides the budget to intelligently launch new models. This was the case for Tezeus: the C8's success paved the way for two other models. These include the SWIFT, a 20" carbon foldable bike, and the C6T, a step-thru model that integrates the C8's onboard technology but features upgraded components.

The Tezeus Swift is a 16 kg (35 lb) 20" carbon fiber foldable bike, equipped with rear suspension, a battery integrated into the seatpost, hydraulic brakes, and an integrated display. It features a 30Nm torque sensor paired with a cadence sensor.

The Tezeus C6T is a well-equipped step-thru with an aluminum frame, a mid-drive motor providing 60Nm of torque, and a range of 130km (approx. 81 miles). It features upgraded components, including an Enviolo shifter and a Gates Carbon belt drive, while retaining the C8's complete onboard technology.

Tezeus C8 - 2024

The C8 is an e-gravel smart ebike equipped with 700*35C tires and a carbon belt drive. Its single-speed version is geared toward urban use, while the 3-speed automatic version allows the C8 to handle all types of terrain.

Its performance stems from a 60Nm mini mid-drive motor (peaking at 500W), which coordinates with cadence, speed, gyroscopic, and accelerometer sensors. It has a range of approximately 100 km (62 miles) from a 360Wh Samsung battery that recharges in 2.5 hours.

Remaining range data is calculated in real-time and benefits from predictive calculations based on riding habits. The integrated smart touchscreen, running on Linux OS, offers complete onboard technology: GPS, 4G, Bluetooth, fingerprint sensor, and light sensors. The C8 ensures safety with a rear millimeter-wave radar and 2-piston hydraulic disc brakes.

Photo credit: TEZEUS

C8's Design :

Photo credit: TEZEUS

While adhering to conventional ebike design lines, Tezeus adopted a sleek design with fully hidden cables and a monocoque carbon fiber frame. They opted for an integrated mini mid-motor, which is nearly invisible and perfectly suited to the all-carbon concept.

The 700*35C wheels further enhance the e-gravel's slim silhouette. The ebike is well-balanced, with the battery, transmission, and motor centered, while the 3-speed gearbox is located in the rear.

The models are two-toned, featuring a darker black on the outer-facing side of the downtube from the motor to the fork—an area often exposed to dirt.

The general components are well-conceived. The brake levers, made from a carbon fiber and high-resistance plastic alloy, are designed to match the bike's fluid lines. The front headlight is molded into the handlebar—a rectangle with rounded corners and a slight tilt. The screen's integration into the handlebar is also noteworthy. Finally, the taillight (which also houses the radar module) hugs the frame without looking out of place. This compactness of components also serves to deter theft of the display or lights. The C8 is smooth, with a finish that is perfect to the touch and the eye.

Photo credit: TEZEUS

C8 's Features :

One Size and Restricted Ergonomics

Offered in a single size, Tezeus recommends the C8 for riders between 1.65 m (5'5") and 1.95 m (6'5"). This is where the difficulty lies.

The handlebar height is not adjustable; its height from the ground to the grips is 0.99 m (3'3"), which is standard (equivalent to a 27.5" bike). The handlebar integrates a 5" display, which does not tilt but compensates with high-definition (1080p IPS) and adaptive brightness.

With a minimum saddle height of 90 cm (35.4 in) from the ground, only the seatpost remains to adjust for rider height. Contrary to the spec sheet defining the maximum height as 1.95 m (6'5") I believe it would be more realistic to limit the maximum rider height to 1.85 m (6'1").

An excerpt from a user video appears to show a rider over 1.90 m (6'3") with the seatpost extended to its maximum height. Since the handlebar is not adjustable, the rider's arm tension and forward-leaning position are not ergonomic.

This is a point to consider. This is the one observable flaw when designing an all-integrated smart ebike; sometimes, manufacturers do not sufficiently account for seatpost length or practical frame ergonomics. Here, the non-adjustable handlebar is problematic for riders taller than 1.90 m (6'3").

Regarding the 700*35C tires, they can be replaced with compatible 40C width tires; however, the fenders cannot be attached with tires wider than 35C.

The Tezeus C8 is available in two drivetrain versions:

The single-speed version, weighing 15 kg (33 lb) with an 11M-118T carbon belt drive.
The auto-internal 3-speed version, weighing 16.5 kg (36 lb), which incorporates an internal gear hub with an 11M-115T carbon belt drive.

The belts are not Gates Carbon Belts, but rather Shanghai Wutong Synchronous Belts. Shanghai Wutong Synchronous Belt also manufactures belts for domestic appliances, like washing machines, and for agricultural machinery.

C8 version Automatic 3-Speed Internal-gear Hub

Consulting the Tezeus support FAQ, Tezeus provides a downloadable "Guide of Gear Shift Adjustment." This DIY guide, provided by the gearbox manufacturer, reveals the origin of the gearbox: LOFANDI-ELEVANDI.

This is a Chinese company based in Guangzhou specializing in smart internal gear hubs and smart bike lock systems (it is best known in the shared bicycle industry). LOFANDI partners with brands such as ANANDA, BAFANG, XDS, LIME, HONGJI, and SEGWAY.

Returning to this manual adjustment procedure, it appears to be straightforward.

Photo credit: TEZEUS C8 & LOFANDI-ELEVAND-l

To set the automatic shifting speed thresholds, use a Phillips screwdriver. First, locate the "Mark 2" (adjusts the shift to 2nd gear) and "Mark 3" (adjusts the shift to 3rd gear) adjustment screws on the side of the hub.

Turn the "Mark 2" or "Mark 3" screw in the "+" (clockwise) direction to increase the speed at which that shift occurs. Turning it in the "-" (counter-clockwise) direction decreases the speed. It is imperative not to exceed five full rotations to avoid damaging the hub.

MJÖLNIR: a Mid-drive 250W Mini motor with 60Nm torque

To maintain its concept of a sleek, lightweight carbon ebike with hidden cables, Tezeus opted for a 2.6 kg (5,7lbs) mini mid-drive motor (250W nominal, 500W peak) integrated into the frame, offering a perfectly smooth visual integration. It is also discreet acoustically, not exceeding 50dB. It integrates a torque sensor providing a base of 60Nm and can reach a peak output of 75Nm.

The Tezeus website features a motor chart showing a Boost mode (15 seconds only) that delivers a maximum of 75Nm in "POWER 3" and "BOOST" assistance modes, a detail not included in the original Tezeus C8 spec sheet.

Although Tezeus claims to have designed and manufactured its MJÖLNIR mini mid-motor, the manufacturer VINKA offers two models with identical specifications (weight, max torque): the VINKA S20 PRO (2.6kg - 5,7lbs, 70Nm) and S30 (2.7kg - 5,9lbs, 75Nm). If you are interested in this type of mini mid-motor, you might also look at FAZUA's RIDE 60 and RIDE 50 TRAIL & STREET (1.8kg - 3,9lbs, 58Nm), or the impressive MAXON DRIVE UNIT AIR S (2kg - 4,4lbs, 90Nm).

VINKA S30 (2.7kg, 75Nm)

VINKA S20 PRO (2.6kg, 70Nm)

FAZUA RIDE 60 (1.8kg, 58Nm)

MAXON AIR S (2kg, 90Nm)

To accurately identify the environment and provide appropriate assistance, the Tezeus C8 relies on an algorithm paired with three specific sensors: a torque sensor, a cadence sensor, and a gyroscopic sensor integrated into the motor. This setup allows for a complete analysis of speed, slope, and pedaling frequency to measure and define the necessary power output, particularly during ascents or descents.

IMU sensor

" Equipped with an IMU, it combines a 3-axis gyroscope and a 3-axis accelerometer. These components accurately track your bike's posture, allowing the motor to fine-tune power for a smooth and safe ride. "

Speed Sensor

" This sensor ensures that the motor assistance is perfectly synchronized with your pedaling, providing just the right amount of power to keep your ride smooth and effortless. "

Torque Sensor & Cadence Sensor

" The torque sensor measures the force you put on pedals, while the cadence sensor tracks your pedaling speed. They ensure it provides just the right power boost for a smooth, personalized ride. "

Photo credit: TEZEUS

The bike features a removable 360Wh Samsung battery. The theoretical range is listed as up to 100 km (62 miles), and it utilizes GaN fast charging technology for a full charge in 2.5 hours. The battery is unlocked via the display, after which it partially ejects.

C8 's Onboard technologies

Millimeter Wave Radar

Photo credit: TEZEUS

The Millimeter-Wave Radar activates automatically as soon as the ebike is in use. It provides real-time detection of vehicles within a 100-meter (328ft) range to the side and rear, using a 60° angle to cover blind spots.

In case of immediate danger, visual and audible (honk) alerts are sent via the display and Bluetooth speaker, vibrations are triggered in the handlebars, and the taillight is activated to flash. These notification modes are configurable via the touchscreen.

Fingerprint unlocking button

Photo credit: TEZEUS

Located on the right side of the handlebar, the touch-sensitive button unlocks the ebike using a fingerprint. This same button also functions as the horn.

A touchscreen HMI

The 5" 1080p IPS touchscreen features scratch-resistant Corning Gorilla Glass with an IP65 waterproof rating, allowing it to be used in the rain and even with gloves. It integrates GPS, a Bluetooth module, 4G, and an ambient light sensor, which automatically adjusts screen brightness and activates the headlights.

The entire system runs on a proprietary OS integrated into the display, developed on a LINUX base (I suspect it's based on UBUNTU TOUCH), making this HMI a true onboard computer that can be used without a smartphone. This interface provides access to configurable features and offers comprehensive services, from ebike start-up to shutdown.

Among the features found on this display:

Weather, date, and time, updated in real-time.
Manually selectable assistance modes (0, 1, 2, 3, Push, Boost—6 power modes in total).
Precise, calculated estimation of remaining mileage based on usage data.
Battery range.
A Google Maps-based navigation module, with its API integrated into the display's OS, allowing it to receive routes from a smartphone.
Battery locking and unlocking.
Front and rear light activation.
Millimeter-wave radar notification settings.
Sound settings for the speaker (ringbell, notifications).
Ebike motion alerts with notifications sent to the smartphone.
Real-time range prediction via an algorithm that analyzes terrain, riding style, and energy consumption.

Photo credit: TEZEUS

C8's SMART App Features

Photo credit: TEZEUS

Regarding app updates, the latest iOS update was on August 28, 2025, while the Android version was updated on October 21, 2025.

The app connects via the C8 display's integrated Bluetooth, which will show a QR code. The bike's setup instructions can then be followed either on the display or through the app.

OTA (Over-The-Air) updates are delivered either via Bluetooth through the app or via 4G using the integrated eSIM.

App features include:

Remote Control: Lock, unlock, and adjust bike settings from phone.
Bike Location: Track the ebike's real-time location using GPS.
Motion Detection Alarm: Triggers an alarm and sends an alert to your phone if movement is detected while the bike is locked.
Custom Ringbell: Choose from a variety of ringbell tones.
Dark Mode: Activates automatically at sunset or on demand.
Safety Tips: Access riding safety information within the app.
Complete monitoring of motor parameters.
Intelligent AI Charging: A full view of the State of Charge and smart charging settings.

Complete monitoring of motor parameters.

Intelligent AI Charging: A full view of the State of Charge and smart charging settings.

C8 's Specifications

Release date : 2024

Photo credit: TEZEUS C8 User manual

from Tezeus Youtube channel

My take on C8...

When I first discovered the Tezeus C8 on Indiegogo a long time ago, I immediately thought of the Urtopia Carbon 1: aside from the display and frame design, all the equipment was similar, even down to the similarities in the promotional campaign (guest athletes, videos, graphic design). Perhaps Tezeus used the same communication professionals to launch their crowdfunding campaign.

In any case, the Tezeus C8 is a real presence, and in 2025, it offers a smart ebike that is truly complete in terms of onboard technology. It's also in step with the times with its 3-speed automatic system and surprises with its powerful mini mid-drive motor!

Two OSes (the ebike OS and Android) to run the C8—is that too much? If we imagine the worst for Tezeus, like bankruptcy—the kind experienced by other major brands that blocked the use of their ebikes due to an unavailable app—one imagines Tezeus won't leave its customers with the same bitter taste, as the ebike's own OS can take over almost entirely. Its open, Linux-based system allows for the integration of many third-party app APIs, which we've seen elsewhere, but in those cases, it was integrated into the app.

This integrated display, running its own OS, is, for me, strong proof of reliability. This only adds to the confidence built by the expansion of its range, which now includes a 20" folding model and a future step-thru.

The Tezeus C8 wanted to be ahead of its time, and now it is an ebike of the times: a carbon design, a touch of eco-responsibility through the integration of recycled plastic for the brake levers, an intelligent drivetrain paired with a surprising, sensor-rich motor, and an HMI at the peak of its capabilities. This C8 is one fine smarty bike.

My only regret: when you're named "Tezeus," a name straight from Greek mythology, you should avoid mixing genres by naming your motor "Mjölnir," a name from Norse mythology. Personally, I would have called this mini-motor "Hephaestus."

Mini-J

My thanks to TEZEUS for their courtesy in allowing me to use their photos.

For more information, visit the official Tezeus website.

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