In this final in our three part series (Part 1, Part 2), we look at the move to weight reduction, technical advances in safety, lighting and signaling, and the rise of belt drives.
Contents
Ultra-Lightweight Materials – Déjà vu
As we’ve mentioned more than a few times over the last year or so, the quest for lighter materials which came to dominate frame and component developments in the late 2000s has now not only taken root in e-bike thinking, but a driving force for brands looking get the edge over each other.
We seem to be seeing a transition from a search for lighter parts to what almost amounts to a reimagining of material science within the bicycle industry. We are currently seeing the 15kg barrier for full-power e-MTBs being dismantled, not just through carbon fiber, but through high-pressure magnesium casting, solid-state chemistries, and bio-composite lattices.
Lighter Batteries
The weight-reduction focus has shifted from battery cells more to the structural housing as well towards semi-solid state chemistries.
Kellys carbon battery becomes available this month. Featured in the AMXXPRO system, these units achieve a record-breaking energy density of 257 Wh/kg. By designing a proprietary carbon-reinforced resin casing and using advanced cell chemistry, a 900Wh battery now weighs only 3.5 kg. That comes in at around 20% lighter than the industry standard compared to a mere six months ago.
Brands like Urtopia (Titanium Zero) and Verge have moved beyond prototypes. By replacing liquid electrolytes with solid ceramic or polymer layers, these batteries eliminate heavy cooling systems and fire-retardant shielding. Claimed weight reduction is up to 22% compared to 2024 Li-ion tech.
Propulsion: High-Pressure Magnesium Casting
Motor manufacturers have transitioned from aluminum to magnesium alloys to shed weight while maintaining high torque for full-power e-bikes.
Developed in partnership with Kellys, the Panasonic GXM AMXXPRO uses a high-pressure die-cast magnesium alloy casing. It delivers a massive 105 Nm of torque at a weight of just 2.56 kg, matching the weight of much lower powered, more lightweight motors (like the 50 Nm TQ-HPR50).
The DJI Avinox System which saw wider adoption in late 2025, utilizes specialized neodymium magnets and magnesium housing to reach 105 Nm at 2.52 kg. This represents the current industry-leading torque-to-weight ratio for mid-drive units.
A subtle but significant July 2025 advancement involves Topologically Optimized internal gears. Instead of solid steel, motors now feature gears with hollowed webbed centers created via high-precision CNC or metal 3D printing, reducing rotational inertia.
Beyond Carbon Fiber
The industry has been heading towards carbon fiber alternatives for some time. We’ve recently noted materials design focusing on biomimetic structures and 3D-printed titanium.
Biomimetic structures refer to engineering designs that copy nature. Instead of using traditional geometric shapes—solid cylinders or rectangular beams for example—engineers use AI and 3D printing to mimic the hyper-efficient patterns found in the natural world, particularly those found in bones, honeycombs, and plant veins.
The Urtopia Titanium Zero uses Grade 5 Titanium for its frame junctions. These parts are 3D-printed with internal lattice structures—hollow but honeycombed—providing extreme rigidity with 30% less material than standard tubing.
AmpliTex Flax-Fiber Composites has introduced non-structural bodywork. Flax fiber bio-composite is lighter than carbon fiber and provides superior vibration damping, reducing the rattle that can come with ultra-lightweight builds.
It’s interesting to note how flax has come full circle. Before the widespread replacement of flax with cotton during the 18th century, flax was the dominant material in clothing manufacturing. While flax fiber has been a staple in the automotive and racing worlds for a few years, it has officially broken into the e-bike scene recently.
New wheelsets and derailleur cages (notably in the SRAM 2026 T-Type updates) now use long-strand thermoplastic carbon. This material is lighter than traditional epoxy-based carbon and is fully recyclable, addressing a major industry sustainability gap.
Probably the most significant material shift in motors, for example, has been the transition from aluminum to magnesium alloys for high-torque units.
Examples again include the Panasonic GXM AMXXPRO which uses a high-pressure die-cast magnesium alloy casing, delivering 105 Nm of torque at 2.56 kg; previously, 100 Nm+ motors weighed in the 2.9 kg to 3.2 kg range.
The DJI Avinox System has been adopted by more boutique brands (eg. Amflow). This motor also uses a magnesium housing and neodymium magnets to hit a weight of 2.52 kg. This mid-drive unit delivers 105 Nm torque via a compound planetary gearset with polymer and metal gears, optimized for quiet operation and MTB performance. Magnesium casing contributes to its class-leading lightness compared to Bosch CX (2.9 kg).
Design Dimension: Topological Optimization
A significant advance in design as been the the use of AI-driven Topological Optimization (we’ll refer to it as AITO here).
AITO enables the reduction of component weight while maintaining strength through stress simulation. It’s a method that gained traction in the industry throughout 2025, enabling skeletal structures in hubs and cranks by removing non-essential material. (The natural evolutionary corollary to Shimano’s hollow tech thinking?)
AITO uses AI and simulation software like ANSYS to redesign parts by iteratively removing material under simulated loads. This produces mass reduction in e-bike frames while keeping stress within safe limits.
A 2025 study from Indonesia’s ITS optimized an electric bike frame using ANSYS 2021 R2 for topology optimization (combined with Backpropagation Neural Network and Genetic Algorithm in MATLAB). Optimal parameters were 45% material retention and 27% retained threshold, reducing frame mass by some 39% while increasing stress by a bit north of 12% (the maximum von Mises stress in the optimized, lighter frame rose modestly from the original design’s baseline while still staying safely below the material’s yield strength of 255 MPa).
One-piece bar-stem combos are increasingly 3D-printed for e-bikes. Aluminium-Lithium alloys provide higher strength-to-weight ratios than traditional 6061 or 7075 series, commonly used in cycling. Airbus’s Scalmalloy (Al-Mg-Sc variant) exemplifies this in printed motorcycle frames, twice as strong as standard aluminum, suggesting viability for bikes.
Enhanced Visibility & Safety Features
The e-bike industry continues to transition from simple visibility tools to Automotive-Grade Active Safety where the responsibility of safety shifts from the rider’s awareness to a bike’s internal intelligence.
Here are some of those technical developments along with brand examples.
Adaptive Lighting & Signaling
The latest systems no longer rely on manual toggles; they use ambient sensors and Inertial Measurement Units (IMU) to manage light as a dynamic safety tool.
The A-Spadz Cavet Air features an automotive grade 230-lux headlight that automatically modulates intensity based on ambient light and speed with high and low beam settings. The bike is equipped with a patented rear brake light built into the saddle.
Bosch’s 2026 Kiox 400C integrated system now links display brightness to the headlight’s output, ensuring the rider is never blinded by their own dashboard in low-light transitions.
Active Hazard Signaling
The LIVALL VG1 AI-visual taillight both brightens and uses Bi-Directional Warning.
When its AI detects an imminent rear-end collision, it triggers an ultra bright burs of light designed to grab the attention of the driver of the vehicle about to hit the bike in front.
Brake-Activated Precision in which typically mid-to-high-tier models from major brands now use accelerometer-based braking lights that distinguish between slowing down and emergency braking, with the latter initiating a high-frequency strobe.
Collision Alerts & Proximity Detection – Radar & LiDAR
A significant development has been the integration of millimeter-wave radar and AI-powered vision.
Giant Aegis Radar
Launched as part of the Smart Gateway 2.0, this system monitors vehicles up to 120 meters away. Unlike previous sensors, Aegis provides a “lateral threat level” on the RideDash Evo 2.0 display, showing not just how far a car is, but if its trajectory overlaps with the bike’s lane via a simple indicator bar or dots representing detected vehicles behind the bike with color coding for threat level and speed difference.
Segway Rearview Radar
Utilizes millimeter-wave technology to detect velocity and angle. It integrates directly with the bike’s central battery, removing the need for separate charging (a common pain point for the Garmin Varia).
Garmin Varia RearVue 820
The newest flagship aftermarket unit. It now identifies vehicle size delivered via voice alerts (e.g., “Large vehicle approaching”) when paired with a Garmin smartwatch or the Varia app thus distinguishing a motorcycle from a semi-truck for example and provides distinct audio tones for each.
V2X (Vehicle-to-Everything) & AI Connectivity
A key advancement in safety tech. Making bikes digitally visible to cars especially through blind corners is a big step forward. Bike advocate purists would argue the best solution is for the separation of bikes and cars and/or the outright banishment of bikes from urban centers. Before we get there, though, technological advances such as this can only help.
Spoke Safety VRU2X
In what for some is a surprising partnership, Viiala and Audi have teamed up: Spoke’s VRU2X (Vulnerable Road User to Everything) was demonstrated in real-world urban environments in early 2026.
Spoke Safety—the technology provider—has developed the VRU2X platform using C-V2X technology. Viiala—the e-bike partner—has integrated VRU2X technology directly into their inaugural high-end e-bike models, which are expected in 2028. Audi is collaborating with Spoke (alongside Qualcomm) to integrate this technology into vehicles.
E-bikes equipped with this a broadcast their position to C-V2X-enabled cars. If a car is about to turn into a cyclist’s path at an intersection, the car’s own braking system can be triggered or the driver receives a high-priority heads-up alert.
AI Visual Judgment
Launched at CES 2026, the LIVALL VGH10 helmet/taillight ecosystem uses an HD 120° camera with edge computing to perform hazard judgment. It uses open-ear audio to alert a rider to approaching cars directly into their ear, bypassing the distracting need to glance at a screen.
High-End Mechanical Safety & Stability
Safety is also being addressed through mechanical automation to prevent accidents resulting from human error.
Stability Control
Bosch ABS Pro
Optimized for eMTBs, it prevents front-wheel lockup even on loose gravel or during panic stops.
Ergonomic Safety
Segway Xiro
An automatic dropper post that senses when a rider is slowing to a stop and lowers the seat so they can put both feet flat on the ground.
Traction Control
Segway TCS
Prevents wheelspin on wet urban paint or ice by modulating motor torque in milliseconds.
Carbon Belt Drives
Carbon belt drives are going mainstream, moving from a niche luxury feature to the standard for any e-bike claiming maintenance-free status.
Material Science & Belt Design
The biggest recent shift has been the transition from one-size-fits-all belts to application-specific elastomers.
Refining the mid-market segment, the Gates Carbon Drive CDC has emerged as a key component for mid-torque commuter e-bikes.
While the system utilizes high-end materials—including a carbon-fiber tensile cord, high-stiffness ethylene elastomer, and nylon tooth fabric—it is specifically engineered for motors with a torque rating around 75 Nm.
Application examples include urban and trekking models such as the Giant Explore E+ 2, where reliability and silent operation are prioritized for daily use.
While the CDX line remains the choice for higher-torque or heavier-duty applications—with product limits and torque allowances that vary based on the specific model and gearing—the CDC provides a targeted, durable solution for the urban commuter class within its mid-torque parameters.
As of early 2026, manufacturers are utilizing higher-density carbon fiber filaments. The goal is to minimize belt stretch under the instant 1,000W+ peak surges common in modern e-MTBs.
Veer (Veer Split Belt Pro) has refined their spliced belt technology. The latest 14mm Split Belt Pro features improved H-NBR (Hydrogenated Nitrile Butadiene Rubber) which offers better resistance to the extreme temperature fluctuations seen in 2025’s summer/winter cycles, maintaining a consistent across a wider thermal range.
Gearbox Evolution
2025 was certainly the year when the future of premium e-bikes as derailleur-free came to realization. The Pinion MGU has become the primary partner for carbon belts.
Historically, belt drives paired with internal gear hubs (like Rohloff or Enviolo) required a momentary pause in pedaling to shift. The Pinion MGU E1.12 uses Smart.Shift technology. This allows the electronic gearbox to shift in 9ms, even while the motor is delivering 85Nm of torque. We’ve come a long way from the days of timing manual shifts between bursts of acceleration, for those of us with the legs to deliver said bursts, of course.
These units claim a 10,000 km oil change interval, which, when paired with a Gates belt, makes the drivetrain effectively sealed for two to three years for the average rider. Maintenance free indeed.
Gravity and High-Stress Validation
The use of belt drives in UCI Downhill Racing has become a thing.
The A.200.G prototype uses a Gates belt drive paired with a Pinion SmartShift gearbox on a downhill bike platform. Atherton Racing officially partnered with Gates Belt Drive along with several other DH teams, under a program incentivized by Gates’ €100 000 Belted Purse challenge for the first World Cup win on a belt-driven bike. The bike is a prototype an early development project, not yet a production race bike. Unproven, yet promising, tech for the near future.
Conclusion of Series
Here are the links to Part 1 and Part 2 in this series. Together they give a snapshot or where the industry is now in the evolution of e-bike technology.
Taipei Cycle is coming up in late March and we’ll be closely looking at what is on display. In next month’s post, we’ll take a look at automatic transmissions, a category of components that has also progressed quickly, and one which we would expect to be well-represented at the Show this year.
EN 
DE