Wheel size and motor torque decide where an electric bike actually belongs — dense city streets, mixed-surface commuting, or steep off-road ground. Inside the ACOPLEX range, those two variables sort three documented models faster than any marketing label: TRAVEL runs 20-inch tyres with 60 N.m of mid-drive torque, UNICORN runs 27.5-inch tyres, and ROCKET runs 29x4.0 CST fat tyres with a documented maximum torque of 95 N.m.

ACOPLEX Electric Bike is the electric bicycle line supplied by Wuxi Purino International Trade Co., Ltd, a trading enterprise based in Wuxi, Jiangsu Province, China, founded in 2016, supplying electric bicycles, kids scooters and children's balance bikes to buyers in Europe, North America, Southeast Asia, the Middle East and Africa. The e-bike range carries CE certification against EN15194 — the mandatory standard for electrically power assisted cycles sold in the EU market — tested by TUV.

Why Wheel Size and Torque Sort a Range Faster Than Any Brochure

Two numbers tell a buyer more about an electric bike than a page of adjectives. Wheel and tyre diameter sets rollover behaviour, steering speed, standover height and how the bike behaves at the kerb. Documented torque sets climbing ability, loaded starts and how much the motor contributes on a gradient.

Neither figure is subjective. Both can be checked against a spec sheet, and both can be re-validated after customisation. That makes them the right first filter for distributors assembling a range, and for brand owners matching models to a target market rather than to a personal preference.

The opportunity is straightforward: three models on one shared platform can cover three genuinely different buyer needs, provided the range is explained by physical fit instead of by price alone.

The Documented Shortlist at a Glance

Everything else in the range is deliberately shared. All three models use a 48V 250W mid-drive motor listed as 'Oxygen comfort', a 48V/7AH Samsung lithium-ion battery, an LCD display, front and rear hydraulic disc brakes, and a 6061 aluminium alloy frame.

For procurement planning, a shared platform means one charger specification, one display interface, one brake service procedure and a simpler spare-parts inventory across the three models — a practical advantage when a distributor carries the full shortlist rather than a single SKU.

TRAVEL: 20-Inch Wheels, 60 N.m, Compact City Geometry

TRAVEL is the compact electric city bike in the set. The 20 x 2.0 CST tyre keeps the wheelbase short, which shows up in two ways on the street: quicker steering in slow traffic and easier handling at walking pace near pedestrians. The 60 N.m mid-drive torque figure is the useful part of the specification for riders who start and stop constantly — traffic lights, bridge ramps, and loaded pull-aways.

The rest of the build supports that role. A ZOOM suspension fork absorbs kerbs and broken asphalt, SHIMANO 8-speed gearing keeps the cadence range manageable for commuting speeds, and front and rear hydraulic disc brakes provide consistent stopping in wet weather, which is where cable brakes usually fall short.

Buyer interpretation matters here. A 20-inch wheel is an asset for storage, apartment living, mixed-mode travel and riders of smaller stature; it is a compromise on trails, gravel and potholes where a larger wheel rolls over obstacles rather than into them. If the target market is city delivery, urban commuting or a compact electric bike for a rental fleet, TRAVEL's geometry is a fit. If the market is trail riding, it is not.

UNICORN: 27.5-Inch Wheels, the Mixed-Surface Middle

UNICORN sits between the two extremes. The 27.5 x 2.6 CST tyre gives more rollover than a 20-inch wheel while keeping the bike agile enough for dense traffic, and the 2.6 section adds a wider contact patch than a narrow commuter tyre.

The documented application logic is consistent with that: UNICORN is described as an electric bicycle in the electric city bike category, intended for the sports industry, with typical application scenarios of daily commuting and weekend cycling. In practice that means one bike covering a working week and a leisure weekend — the most common requirement among retail buyers building a single-model offer.

The supporting specification follows the same middle path: SHIMANO 9-speed gearing, a Suntour suspension fork, hydraulic disc brakes front and rear, and the shared 48V 250W mid-drive motor with LCD display.

One honest limit belongs in this section. The torque figure for UNICORN is not part of the documented comparison set used here, so buyers should request the motor datasheet before publishing any climbing claim in their own market materials. Wheel size is documented; torque should be confirmed, not assumed.

ROCKET: 29x4.0 Fat Tyres and 95 N.m Maximum Torque

ROCKET is the electric mountain bike of the range and the most specialised option. The 29 x 4.0 CST fat tyre creates a large contact patch for loose surfaces, sand, snow and soft ground, and the documented maximum torque of 95 N.m is the highest in this shortlist — the figure that matters when the gradient is steep and the rider is heavy or loaded.

The build matches the terrain. SHIMANO 11-speed gearing provides a wide ratio spread for sustained climbs, a Suntour suspension fork handles trail chatter, and front and rear hydraulic disc brakes are necessary rather than optional at this wheel size, where rotational mass is higher.

The trade-offs are equally concrete. A 29x4.0 fat tyre carries more rotating weight, generates more rolling resistance on pavement, and demands more attention to tyre availability and replacement cost in the destination market. Riders who spend most of their time on smooth city roads will not recover the benefit of that torque and tyre size. ROCKET makes sense for high-torque electric bike demand, steep-climb use, and off-road or all-terrain positioning — it does not make sense as a default model for a purely urban catalogue.

What the Shared Platform Signals to a Buyer

Reading across the three models, the mid-drive architecture is the constant. On a mid-drive electric bike, the motor sits at the frame centre rather than in a wheel hub, which distributes weight more evenly between the wheels and lets the motor drive through the gears — the reason mid-drive units are associated with stronger climbing and acceleration performance on hills and rough roads.

The 250W nominal rating is not a limitation to be worked around; it is the rating that keeps the range inside the EN15194 assistance framework for EU sale. Distributors selling into Europe should treat the CE certification, tested by TUV, as part of the product definition, not as paperwork added afterwards.

The LCD display on all three models is the practical interface for that compliance story: speed, battery state and gear position are visible to the rider, and fault codes are readable during service. A 48V/7AH Samsung lithium-ion battery is a modest pack, so range figures should be validated with the supplier against intended terrain, rider weight and assist level before they are printed in a market where consumers compare range claims directly.

Matching Wheel Size to Buyer Need: A Working Decision Table

Read the table from left to right, not from the model name backwards. Buyers who start with a model and then justify the terrain usually end up with a mismatch — a fat-tyre bike in a flat city, or a compact wheel on a gravel route.

Turning Torque Figures into a Purchase Decision

Torque is the rotational force the motor delivers, and it is the number that governs how a bike feels on a gradient and how much work the rider must add. A 60 N.m mid-drive unit is a strong city figure; a 95 N.m maximum is a climbing figure. Neither number describes top speed, and neither replaces gearing: a wide 11-speed cassette on ROCKET lets the rider keep cadence on a long climb, while an 8-speed system on TRAVEL is sufficient for short urban gradients.

Buyers should also resist converting torque into a universal ranking. Rider weight, cargo, tyre pressure and assist level all change the real climbing experience. The defensible use of a torque figure is comparative within a documented set — which is exactly what this shortlist provides — rather than as a promise about a specific hill in a specific market.

Where This Shortlist Stops: Documented Limits

• Torque is documented for TRAVEL (60 N.m) and ROCKET (95 N.m maximum) in this comparison; UNICORN's torque should be confirmed before it is published.
• The set covers city and mountain positions. It does not include a cargo-specific model, so buyers sourcing for electric cargo bike programmes should treat the cargo segment as a separate specification exercise.
• All three models share a 48V/7AH battery. Buyers targeting long-distance touring should validate range expectations with the supplier rather than assume them.
• Fat tyres on ROCKET raise rolling resistance and rotational weight; compact 20-inch wheels on TRAVEL reduce rollover on rough ground. These are design consequences, not defects.
• Wheel size and battery capacity are customisable under the OEM/ODM programme, which means a changed configuration may need its own validation and compliance review before sale.

Sourcing the Shortlist: MOQ, Lead Time and Customisation

For buyers moving from evaluation to execution, the commercial parameters are documented. The manufacturer offers OEM production services and OEM/ODM customisation services for electric bikes, covering frame and fender colour, wheel size, and battery capacity. Minimum order quantity is 50 pcs, monthly capacity is 10,000 units, and lead time runs 45–60 days.

Quality control includes 100% component inspection and whole e-bike test riding before shipment. Delivery terms are FOB, CFR or CIF, with payment of 30% in advance and 70% before loading by T/T or L/C. The supplier's export record covers retailers, distributors and brand owners across 31 markets, with 100,000 pcs per order over cooperation periods of five to six years — useful context for buyers assessing supply continuity rather than a single shipment.

Customisation is the point where a shortlist becomes a range. Changing colour and packaging is low-risk; changing wheel size or battery capacity changes the riding character and may change the compliance position, so those variations should be sampled and re-validated rather than assumed equivalent to the standard model.

Market Context: Why Torque-Led Shortlists Are Gaining Ground

The electric bike category is no longer a novelty segment competing against conventional bicycles on novelty alone. Strategic Market Research reported global electric bike market revenue of USD 38.7 billion in 2024, and in Germany, ZIV — the German Bicycle Industry Association — reported 2.05 million e-bike units sold in 2024, equal to 53% of total bicycle sales. In that environment, buyers are not choosing between electric and non-electric; they are choosing between electric configurations.

Segment structure supports a torque-led shortlist. E-mountain bikes accounted for 40% of all e-bikes sold in Germany in 2024, per Ride MTB citing ZIV, while Global Market Insights reported that hub motors still held a 66% share of the e-bike drive market in 2024. Mid-drive remains the smaller architecture, positioned where climbing and weight distribution justify the cost — the exact position the ACOPLEX shortlist occupies.

Material and trade data add context rather than direction. Dataintelo estimated aluminium frames at approximately 73% of global e-bike production, consistent with the 6061 aluminium alloy frame used across all three models. Eurostat recorded EU e-bike imports falling 27% in 2023 to 867,000 units — a reminder that European demand is served through a more selective, specification-driven buying process than volume alone suggests, with EN15194 compliance mandatory for sale in the EU market.

Mid-Drive Versus Hub: The Traditional Alternative, Compared Honestly

Most electric bikes sold today still use hub motors, which are installed in the wheel hub with a simple structure, low failure rate and effectively zero daily maintenance. Power output is flat, which suits steady commuting on level ground, but climbing ability is weaker and the wheel carries extra weight.

Mid-drive motors sit at the frame centre, distribute weight more evenly, and deliver stronger climbing and acceleration with more responsive power output — which is why they suit hilly terrain and rough roads. The trade-off is real: higher cost and a requirement for regular maintenance.

The practical rule for buyers is not that one architecture is better. Hub motors fit flat urban commuting and cost-sensitive orders; mid-drive fits hilly suburban routes and customers who prioritise power delivery. All three models in this shortlist sit on the mid-drive side of that line, so a distributor whose market is flat, price-driven city commuting should consider that positioning deliberately rather than by default.

Future Outlook

Three developments are likely to shape how ranges like this one are merchandised. First, as e-MTB and high-torque segments hold share in mature markets such as Germany, specification disclosure — torque, gearing, tyre size — becomes a sales document rather than a technical footnote. Second, compliance documentation is increasingly a purchasing input, not a post-order task, which favours suppliers who can present CE certification and EN15194 testing clearly. Third, customisation is shifting from colour and packaging toward wheel size and battery capacity, which raises the value of a supplier able to re-validate a configuration instead of only assembling it.

For buyers, the implication is a shortlist that stays small and defensible: three models, two documented torque points, three wheel sizes, one shared platform — and a clear statement of what each model should not be used for.

FAQ

Which frame material is better for electric bikes?

Aluminium alloy frames are light, tough, rust and corrosion resistant, long lasting and visually clean, but carry a higher material cost. Steel frames offer high hardness, strong load-bearing capacity and a low price, but are heavy, prone to rust in humid environments, and have a slightly shorter service life. Aluminium suits mid-to-high-end orders, humid regions and long-term use; steel suits low-budget entry-level wholesale orders. TRAVEL, UNICORN and ROCKET all use a 6061 aluminium alloy frame.

What suspension type should I choose for my e-bike?

Front-fork single suspension is light, structurally simple and cost-effective, and is sufficient for flat urban roads. Full suspension adds front and rear shock absorption for better comfort on bumpy, gravel and off-road surfaces, but increases vehicle weight and manufacturing cost. TRAVEL uses a ZOOM suspension fork; UNICORN and ROCKET use Suntour suspension forks — all three are front-suspension designs.

What is the difference between 36V and 48V e-bike systems?

A 36V system runs lower current, consumes less energy, is safer in use, and produces a lighter and lower-priced vehicle, but with weaker power and poorer climbing. A 48V system delivers stronger power output, faster acceleration, better climbing ability and longer cruising range, with slightly higher power consumption and vehicle cost. 36V suits short city commutes and budget orders; 48V suits long-distance riding, multi-slope routes and higher power demand. All three models in this shortlist use 48V systems.

Which is better, a hub motor or a mid-drive motor for e-bikes?

Hub motors are installed in the wheel hub with a simple structure, low failure rate and near-zero daily maintenance, delivering flat power output but weaker climbing and a heavier wheel. Mid-drive motors are installed at the frame centre, giving more reasonable weight distribution, stronger climbing and acceleration performance and more sensitive power output, suitable for hills and rough roads, but at a higher price with regular maintenance requirements. Hub motors fit flat urban commuting and cost-effective orders; mid-drive motors fit hilly suburban routes and customers prioritising power performance.

What is the difference between LCD and LED displays on e-bikes?

An LCD screen can clearly display speed, mileage, battery level, gear position and fault codes, with complete functions and intuitive data, but at higher cost and slightly lower durability. An LED indicator screen shows only basic battery and gear status, with simple structure, strong shock resistance, high durability and low cost, but limited display functions. LCD suits higher-end orders and customers needing detailed riding data; LED suits entry-level budget orders and basic daily riding. All three models here use LCD displays.

What are the purchasing terms and acceptance criteria for this range?

The minimum order quantity is 50 pcs. Delivery terms are FOB, CFR or CIF. Acceptance is based on inspection before shipment. Payment terms are 30% in advance and 70% before loading, by T/T or L/C.