SX-E 5

The verdict

The KTM SX-E 5 earns a VoltRipper Score of 86/100. It is an excellent youth motocross bike — genuinely premium hardware, dealer-backed, and the most recognisable badge in junior MX. It also sits one point below the mechanically identical GasGas MC-E 5 for one reason: it costs $350 more for the same machine.

We are not going to pretend that gap is a quality judgement. The SX-E 5, MC-E 5 and Husqvarna EE 5 come off the same platform with the same battery, motor, chassis, suspension and brakes. Our Score is value-weighted within a class, so when the hardware ties, price breaks the tie. What you are deciding here is whether the orange badge and the KTM dealer network are worth $350 — and for a lot of families, they honestly are.

Who it's for — and who should skip it

Buy it if your nearest, best-stocked dealer is a KTM store. This is not a small consideration and it is the reason we would not tell everyone to reflexively buy the GasGas. A youth MX bike needs setup, warranty coverage, consumables, and eventually battery service; a dealer forty minutes away beats one four hours away by far more than $350. Buy it too if your rider races, where the KTM badge carries real paddock currency and, in our judgement, the strongest resale of the three.

Skip it if the dealers are equally convenient — then the GasGas is the identical bike for $350 less. Skip it if you need a lower seat: the Husqvarna EE 5 drops to 24.2 in unassisted and 21.6 in with the accessory kit, against this bike's 24.9 in floor. And skip the whole platform if the delivered price is a stretch. The Greenger CRF-E2 scores 83 at $1,799 and will teach a child to ride perfectly well.

What you actually get

Real WP-suspended motocross hardware, scaled to a child.

The pack is a 48V, 21Ah, 907 Wh KTM PowerPack, swappable, charging 0–80% in 45 minutes and 0–100% in 70 minutes. The motor is 2 kW rated at 3,200 rpm, 5 kW peak at 3,900 rpm, and for 2027 it is water-cooled — the group credits the change with roughly 30% more running time and consistent power delivery instead of heat fade. On a bike whose runtime is measured in motos rather than miles, 30% more of it is the most valuable thing about this model year.

Around it: WP suspension, 205 mm front / 193 mm rear travel, 160 mm hydraulic discs front and rear, 12-inch front and 10-inch rear wheels, a Chromoly steel frame with a fibreglass-reinforced subframe that mounts in multiple positions, a 1,028 mm wheelbase and 259 mm (10.2 in) of ground clearance, at 40.5 kg (89 lb). Six ride modes are selected at the display between the steering head and the seat, and the modes lock with a dongle stored under the seat — the feature that lets you hand the bike to a beginner without handing them race power. A rollover sensor cuts the motor in a fall, and a wrist lanyard key is the second kill path.

Seat height runs 24.9–26.8 in (634–682 mm), changed in two steps by lowering the bodywork and seat and remounting the shock, with the forks also droppable in the triple clamps. KTM's own phrase is that the bike can "grow with your young racer," and that is the honest function of it.

What is not published — and one transparency knock. KTM publishes no top speed and no mileage range; runtime is quoted per mode. KTM's own SX-E 5 page also omits weight, battery amp-hours, and motor torque — figures its sister brands publish openly for the identical machine. We take those from the Husqvarna EE 5 and GasGas MC-E 5 pages and say so rather than presenting them as KTM's. It is a small thing, but a manufacturer that omits the weight of a children's motorcycle while its own sibling brand prints it is worth noting on a review page.

Why the Score is 86

The VoltRipper Score measures fitness-for-purpose within a class. The SX-E 5 scores highly on class power, chassis, and support — WP suspension, dual hydraulics, a franchised dealer network and a mode-lock safety system are all genuinely premium for youth machinery. Its deduction is on value, and only on value: $5,799 plus $425 freight is $6,224 before dealer setup, for a bike a child outgrows.

The single point separating it from the GasGas is that price gap and nothing else. If you would rather read the platform as one bike with three prices, that is exactly correct, and it is how we would advise a friend to think about it.

The ownership story that belongs on this page

Every SX-E 5 review will tell you about the WP forks. Almost none will tell you what happened to the company, and on a $6,000 purchase you deserve it.

• November 2024 — KTM AG files for restructuring under Austrian insolvency law, with self-administration.
• January 2025 — Stefan Pierer, synonymous with KTM for decades, is replaced as CEO.
• Creditors are paid roughly 30 cents on the euro.
• November 2025 – January 2026 — India's Bajaj Auto takes 74.9%, and PIERER Mobility AG is renamed Bajaj Mobility AG.
• February 2026 — a €550 million refinancing is secured; the first post-restructuring quarter shows positive EBITDA, but the company is still lossmaking at the operating line (EBIT −€26.1m in Q1 2026), and European market share fell from 11.1% to 4.7% during the production stoppages.

What this means for you, practically: not that KTM disappears — it is refinanced and majority-owned by one of the world's largest motorcycle manufacturers. The real, concrete risk is dealer parts and service depth, which genuinely thinned during the stoppages. Before you buy, ask your dealer two direct questions: what are current parts lead times, and who services the battery and controller under warranty. That is a better use of five minutes than any spec comparison on this page. Our full KTM electric dirt bike guide covers the corporate picture in depth.

Buy the right generation

The 2027 SX-E 5 is water-cooled; earlier SX-E 5s were not, and the model name did not change. Dealers sell prior-year stock alongside current bikes, so you can pay near-current money for the older air-cooled machine without noticing. Confirm the model year on the paperwork and ask the dealer explicitly whether the bike on the floor is water-cooled. It is the most expensive mistake available here, and the badge will not tell you.

Safety and age

A competition-capable motorcycle sized for a child. Start in the lowest mode, use the dongle mode-lock, use the lanyard, and require full safety gear — helmet, goggles, gloves, boots, body armor — every ride, every time. It is not street-legal (why); ride private property, OHV areas, or sanctioned events.

How it compares

The comparison that should actually give you pause is the Greenger: a third of the price, 83 to this bike's 86, and entirely adequate for a child learning to ride. The KTM buys WP suspension, water cooling, the mode lock, dealer support and resale. Those are real. Decide whether they are $4,000 real for your family.

Bottom line

The KTM SX-E 5 is a genuinely excellent youth motocross bike carrying a badge premium over an identical machine. That premium is $350 against the GasGas MC-E 5. Pay it for a closer KTM dealer or for race-paddock resale — both are legitimate. Do not pay it believing you are getting better hardware, because you are not, and if you need a lower seat the Husqvarna EE 5 is the sibling to buy. Confirm the water-cooled 2027 model, get an out-the-door price with freight and setup, and ask about parts lead times given the restructuring. Then check it honestly against the Greenger CRF-E2. Our kids guide and the Find Your Ride configurator can help.

Go deeper on the KTM SX-E 5:

• 48V Electric Dirt Bikes

VoltRipper is spec-verified and data-driven. We do not claim hands-on testing of this bike. We earn nothing on this recommendation — the KTM-group brands sell through franchised dealers with no affiliate program, so pointing you at the cheaper sibling costs us nothing. Specs and prices are cross-checked against the manufacturer's own 2027 model pages; weight, battery amp-hours and motor torque are taken from the identical Husqvarna EE 5 / GasGas MC-E 5 pages because KTM's own page omits them. Corporate figures are from Bajaj Mobility AG's filed reports. Where a figure is not published, we leave it blank rather than estimate. Prices exclude dealer setup and tax.