DYU SP1 Review: A Lightweight Folding E-Bike Built Around Portability

Electric bikes often become less portable as manufacturers add bigger batteries, larger motors and heavier frames.

The DYU SP1 takes almost the opposite approach.

DYU lists the SP1 with a 20-inch aluminum folding frame, 250W rated motor and a relatively small 24V 5Ah removable LG lithium-ion battery. More importantly for its intended use, the company lists the bike at approximately 14 kg—30.9 lb—excluding the battery and fenders, with folded dimensions of 700 × 450 × 620 mm.

That combination makes the SP1 less about maximizing range and more about solving a different problem: what if an e-bike also needs to be carried, folded, stored or combined with other transportation?

Quick verdict

The DYU SP1 is one of the more specialized e-bikes in DYU's lineup.

Its published specifications point toward short urban and multimodal journeys rather than long recreational rides. The 250W motor, compact 20-inch format and folding mechanism are paired with a 24V 5Ah battery—only 120Wh based on the published voltage and capacity.

That's modest battery capacity compared with many conventional e-bikes. But treating that automatically as a weakness misses the design objective.

The SP1 prioritizes lower weight and portability instead.

For apartment dwellers, commuters combining cycling with trains or cars, and riders who frequently need to physically move their bike, that trade-off can make sense. DYU itself describes the model as travel-focused and emphasizes its folding dimensions and removable power-bank concept.

If your priority is long-distance riding, however, a larger-battery e-bike is the more logical category to investigate.

What is the DYU SP1?

The SP1 is a 20-inch folding electric bicycle built around an aluminum frame.

DYU specifies a 250W brushless DC motor paired with a 24V 5Ah LG lithium-ion battery. The battery is removable and is central to what DYU describes as its power-bank concept.

The bike also includes TR 160mm disc brakes and OSRAM LED front and rear lighting. DYU's European product documentation identifies those lights as USB rechargeable.

The assistance behavior published by DYU is also worth noting. The specifications describe proportional assistance between 0 and 10 km/h followed by decreasing assistance between 10 and 24 km/h.

This isn't positioned as a high-output performance machine.

It's a compact mobility product.

Portability is the main reason to consider it

The most meaningful SP1 specification may not be the motor.

It's the weight.

DYU lists approximately 14 kg excluding the battery and fenders. The folded package measures 700 × 450 × 620 mm.

Those numbers matter because “folding e-bike” can describe some surprisingly heavy machines.

A folding mechanism doesn't automatically make a bike pleasant to carry up stairs or lift into a vehicle. Battery size, motor hardware and frame construction still add weight.

The SP1 deliberately avoids an oversized battery, which helps explain its portability-oriented specification.

That creates a clear buyer decision.

If you rarely lift your e-bike, sacrificing battery capacity to reduce weight may offer little benefit.

If you regularly encounter stairs, station platforms, elevators, apartment corridors or car trunks, weight becomes much more important.

The removable battery is small by e-bike standards

The SP1's 24V 5Ah battery works out to approximately 120Wh using the published nominal specifications.

That's an editorial calculation rather than a separate manufacturer claim.

The implication is straightforward: this is not a battery specification designed around extremely long rides.

DYU's own recent SP1 guidance frames the model around short journeys and planning charging around destinations rather than treating it like a large-battery touring bike.

The official specifications put charging time at approximately three to four hours.

For the intended user, that may be a reasonable compromise. Someone cycling a short distance to a station or office may care more about being able to move and store the bike easily than about having hundreds of watt-hours of unused battery capacity.

But range-focused buyers should understand the trade-off before purchasing.

250W motor: appropriate context matters

DYU lists the SP1's motor at 250W rated output.

Motor wattage alone doesn't establish climbing performance, acceleration or real-world ride quality, so we would not infer those characteristics without independent testing.

What can reasonably be said is that the motor specification fits the broader lightweight urban concept of the bike.

This isn't the same approach as DYU's much heavier M20, which combines its 250W rated motor with a substantially larger 48V 18.2Ah battery.

That difference illustrates why the SP1 and M20 shouldn't be treated as interchangeable simply because they share a brand.

Folding dimensions and storage

Folded, the SP1 measures 700 × 450 × 620 mm according to DYU.

That can be particularly relevant for people living in apartments without secure ground-floor bicycle storage.

It may also help when the bicycle has to share space with luggage or other equipment in a vehicle.

However, “folding” shouldn't be interpreted as “tiny.”

Those dimensions should still be measured against the intended storage location before ordering. A buyer planning to fit the bike into a specific trunk, closet or storage compartment should verify the available space rather than assuming compatibility.

Brakes and lighting

The SP1 uses TR 160mm disc brakes.

DYU also lists OSRAM LED front and rear lights, with its European documentation identifying them as USB rechargeable and StVZO-certified.

These are useful commuting-oriented specifications, but they shouldn't be turned into claims about real-world stopping distance or nighttime visibility without testing.

Pricing and value

CouponHomeSquad currently lists the DYU SP1 at approximately $1,775, reduced to $1,302.

DYU's regional European websites currently show different euro prices, which can vary by market, configuration and timing. The prices above are the ones CouponHomeSquad lists for this deal.

From a value perspective, the SP1 shouldn't be compared solely on battery capacity.

A large-battery bike will easily beat its 24V 5Ah specification on stored energy. The more relevant question is whether the buyer is willing to trade battery capacity for lower published weight and a compact folding format.

If portability isn't valuable to you, the SP1's proposition becomes substantially weaker.

If portability is the primary constraint, the calculation changes.

SP1 versus a conventional full-size e-bike

The SP1 represents a series of deliberate compromises.

A larger conventional e-bike can accommodate substantially more battery capacity. It may also offer larger wheels, more cargo options or specifications better suited to longer recreational rides.

The SP1 counters with a 20-inch folding format and relatively low published weight.

Neither approach is universally better.

Someone cycling 30 miles without needing to lift the bicycle has different priorities from someone riding a few miles to a station and carrying the bike through part of the journey.

That's why the SP1 is easiest to understand as a mobility tool for short mixed-mode journeys, rather than a miniature replacement for every kind of e-bike.

Who should consider the DYU SP1?

The SP1 deserves consideration from riders who place unusually high value on portability.

That could include apartment dwellers without convenient bike storage, commuters mixing cycling with public transportation, people transporting an e-bike by car, or riders whose daily distances are relatively short.

The removable battery and three-to-four-hour published charging time can also suit routines where charging is available at a regular destination.

Who may want to look elsewhere?

Long-distance riders should compare larger-battery alternatives.

The same applies to buyers who never expect to fold or carry their bicycle. In that scenario, one of the SP1's central advantages becomes irrelevant while its smaller battery remains a limitation.

Anyone prioritizing cargo capacity, aggressive off-road riding or high-output performance should also investigate models designed specifically for those purposes.

Ways to save on the DYU SP1

The current DYU SP1 deal on CouponHomeSquad is approximately $1,775 → $1,302.

There's no DYU coupon for this product right now.

More DYU deals are available on the Dyucycle store page.

Final verdict

The DYU SP1 is interesting because it doesn't try to win the battery-capacity race.

Its specification sheet points toward a different priority: making an electric bicycle easier to integrate into journeys where the rider sometimes has to stop riding and start carrying, folding or storing it.

The 14 kg published weight, 20-inch folding frame and removable 24V 5Ah battery all support that strategy.

They also define its limitations.

If range is your first priority, the SP1 is difficult to justify against larger-battery alternatives. If you rarely fold a bike, there's little reason to accept the compromises necessary to make one more portable.

But for short trips where an e-bike has to coexist with stairs, trains, apartments or car trunks, the SP1 has a much clearer purpose than simply being “another folding e-bike.”

FAQ

How much does the DYU SP1 weigh?

DYU lists it at approximately 14 kg (30.9 lb), excluding the battery and fenders.

What battery does the SP1 use?

DYU specifies a removable LG lithium-ion battery rated at 24V and 5Ah.

How long does the SP1 take to charge?

The official specification lists approximately three to four hours.

What motor does the DYU SP1 use?

DYU lists a 250W rated brushless DC motor.

How small is the SP1 when folded?

Its published folded dimensions are 700 × 450 × 620 mm.

Is the DYU SP1 suitable for long-distance riding?

Its small 24V 5Ah battery makes portability the stronger part of its proposition. Buyers prioritizing long range should compare larger-battery models.