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Ask a commuter why they bought a folding bike and they rarely say "top speed". They say the hallway, the lift, the car boot, the 7:12 train. If you are comparing our electric bicycles with a scooter instead, the same logic applies — but the numbers change, so this guide sticks to e-bikes and covers our electric scooters separately. The hard numbers that decide everything are not on the motor. They are on the tape measure and the luggage rules: 73% of people living in EU cities live in flats (Eurostat, Housing in Europe — 2025 edition, 2024 data), Dutch railways NS let a fully folded bike under 45 × 86 × 80 cm travel free all day, SNCF accepts a folded bike measuring up to 90 × 130 × 50 cm as luggage on TGV INOUI and Intercités, and Renfe treats a folding bike as hand luggage when its three sides add up to no more than 180 cm — free on Cercanías, Media Distancia, AVE and Alvia. Germany's DB carries folded bicycles and folded pedelecs free as luggage, while a full-size bike needs a bike ticket. Four operators, four different numbers, one conclusion: measure before you buy. Why folded size, not top speed, decides whether a bike works for you Europe's 2025 bicycle market tells you that riders are already voting this way: EU bicycle and e-bike sales reached 15.618 million units worth €18.252 billion in 2025 (European Cycling Industries, 2026 Bicycle Industry Market Profile). What that data hides is the storage problem behind every purchase. A 26-inch fat bike parked in a fifth-floor flat with no lift is a piece of furniture; a 20-inch folding frame that halves its own wheelbase is a bicycle again. So we compare the five SUNNIGOO e-bikes on the numbers that actually matter for storage and travel: frame type, net weight, wheel and tire format, and the shipping carton you will meet on delivery day. The five SUNNIGOO e-bikes side by side Every figure below is taken from our own product pages as of October 2026. Prices are the current sticker price with the live strikethrough reference. Model Folding frame Net weight Wheels / tires Shipping carton Price B1 Yes — alloy folding frame 28.3 kg 20 × 4.0" fat 144 × 29 × 72 cm €1,049 (was €1,299) B3 Yes — alloy folding frame 29.2 kg 20 × 4.0" fat 140 × 28 × 70 cm €1,049 (was €1,299) B4 Yes — full suspension 30 kg 20 × 4.0" fat 146 × 28 × 70 cm €1,079 (was €1,329) B5 No — compact urban frame 33 kg 20 × 4.0" fat 147 × 28 × 79 cm €1,049 (was €1,299) C91 No — speed pedelec frame 32 kg 20 × 4.0" fat 146 × 32 × 78 cm €829 (was €999) One honest caveat before you read any further: the carton figures above are the shipping box, not a folded measurement — they are the upper bound of what arrives at your door, and a folded bike is normally smaller than its box. If you plan to travel by train, fold your own bike and measure it with a tape. No manufacturer's marketing sheet replaces that. What European train operators actually measure Netherlands (NS): the strictest number in Europe NS is the cleanest rule to plan around: a fully folded folding bike smaller than 45 × 86 × 80 cm travels free of charge all day. Above that size you need a Fietskaart Dal at €8.50 and you can only travel outside peak hours (weekdays between 9:00 and 16:00, and after 18:30). That is the smallest envelope of any operator we checked — 45 cm of depth is not much room, and it is the number that rules out a bulky fat-tire frame. France (SNCF): a 90 × 130 × 50 cm luggage envelope On TGV INOUI and Intercités, SNCF accepts a folded bike measuring up to 90 × 130 × 50 cm as luggage, at no extra charge. On Transilien and Île-de-France services the split is by folding, not by size: folding bikes are accepted when folded, while full-size bikes are only allowed off-peak — before 6:30, between 9:30 and 16:30, and after 19:30 on weekdays. Spain (Renfe): the 180 cm rule Renfe treats a folding bike as hand luggage when the sum of its three sides is no more than 180 cm, free on Cercanías, Media Distancia, AVE and Alvia. A full-size bike (around 200 cm) is not permitted on AVE and Larga Distancia trains. Since September 2026 Renfe also allows compliant e-scooters on board when folded and switched off, provided they fit within 120 × 50 × 55 cm. Germany (DB): folded equals luggage Deutsche Bahn allows folding bicycles and folding pedelecs to be carried when folded, treated as luggage rather than as a bicycle, so no bike ticket is required. Pedelecs must be limited to 250 W and 25 km/h with the battery secured. Full-size bicycles need a Fahrradkarte. Will it fit a car boot or an apartment hallway? For the boot test, the reference points are Volkswagen's own figures: a Golf offers 374 litres with the seats up and 1,237 litres with them folded, while a Polo gives 351 litres and 1,125 litres. A folded 20-inch bike is a bulky, heavy object — roughly the footprint of a large suitcase and the weight of three of them — so plan on dropping at least one rear seat for a fat-tire folding e-bike. For the hallway test the constraint is not floor area but the turn: a folded frame still needs to clear a door frame and a stair landing. That is why the 20-inch wheel format matters — all five bikes here use it, which keeps the folded package compact in a way a 26-inch frame cannot be. Weight is the number nobody advertises Riders obsess over watt hours and ignore kilograms until the first staircase. Our own figures: B1 at 28.3 kg, B3 at 29.2 kg, B4 at 30 kg with full suspension, B5 at 33 kg, and C91 at 32 kg. None of these is a bike you carry up four floors daily; all of them are bikes you can lift into a boot, a lift or a train luggage rack. If your commute involves stairs with no lift at either end, the B1 is the lightest option in the range. Which model fits which rider B3 — the folding all-rounder for mixed city and trail use The SUNNIGOO B3 is the balanced choice: a 250 W EU-standard motor, 25 km/h assist cut-off, 48 V 12.5 Ah (600 Wh) removable battery, 35–40 km in electric-only mode and 50–80 km in pedal-assist, Shimano 7-speed gearing, Chaoyang 20 × 4.0" fat tires and hydraulic disc brakes — in a foldable alloy frame of 29.2 kg at €1,049 (was €1,299). Throttle-only riding is intended for private land or off-road use where local rules allow it. B1 — the lightest of the folders The SUNNIGOO B1 shares the powertrain and the hydraulic brakes but comes in at 28.3 kg with a heavy-duty rear rack and an integrated LED front light — the practical pick if you will be lifting it regularly. Also €1,049 (was €1,299). B4 — when comfort on bad surfaces wins The SUNNIGOO B4 adds full suspension, a 120 kg maximum load and a 30 kg net weight with the same 600 Wh battery and 50–80 km pedal-assist range, charging in about 6–7 hours. €1,079 (was €1,329). B5 — the compact non-folder The SUNNIGOO B5 is the honest exception: it does not fold. What it offers instead is the largest combined range of the group — up to 120 km on a single charge — plus a rear rack and front basket mounts, in a 20-inch format that is far easier to store than a 26-inch fat bike. €1,049 (was €1,299). Buy it for the range and the rack, not for the train. C91 — power, with paperwork The SUNNIGOO C91 is a different animal. Its 1000 W motor and 55 km/h top speed place it in the speed-pedelec class under EU type-approval rules (Regulation (EU) 168/2013, category L1e-B), not in the 25 km/h pedelec class. In Germany, France, the Netherlands and Belgium that generally means an approved helmet, third-party insurance and a registration plate, with standard cycle paths off-limits. It carries up to 150 kg and starts at €829 (was €999) — check your national rules before ordering, and expect it to travel by van rather than folded into a luggage rack. On any of the 250 W folding models, newsletter subscribers can use code EBIKE10 for 10% off the e-bike collection — one redemption per customer. Conclusion Measure your hallway, your boot and your train operator's limit before you fall in love with a motor: in Europe it is the folded footprint, the kilogram count and a 45 × 86 × 80 cm Dutch envelope — not top speed — that decide whether an e-bike actually fits your life. FAQs 1. Which SUNNIGOO e-bikes fold? The B1, B3 and B4 have folding alloy frames; the B5 and the C91 do not fold. All five use compact 20-inch wheels and 20 × 4.0" fat tires. 2. How big is a folded electric bike? Manufacturers rarely publish a folded measurement, and it varies with handlebar and pedal position. What we publish is the shipping carton: 140 × 28 × 70 cm for the B3, 144 × 29 × 72 cm for the B1, 146 × 28 × 70 cm for the B4, 147 × 28 × 79 cm for the B5 and 146 × 32 × 78 cm for the C91. Treat the box as the upper bound and measure your own folded bike before travelling.3. Can I take an e-bike on a train in Europe? On most services, yes, if it is folded. NS allows a folded bike under 45 × 86 × 80 cm free all day; SNCF accepts folded bikes up to 90 × 130 × 50 cm as luggage on TGV INOUI and Intercités; Renfe accepts folding bikes as hand luggage up to 180 cm in total dimensions; DB treats folded bikes as luggage. Rules and peak-hour restrictions differ, so confirm with the operator on the day you travel. 4. Are these e-bikes road legal without insurance in Germany? The 250 W, 25 km/h models (B1, B3, B4, B5) are configured as EU pedelecs, which is the class that normally needs no registration, no plate and no insurance in Germany. The C91 is a speed pedelec and does require them. Separately, note that German rules for e-scooters are stricter than for pedelecs: on public roads only ABE type-approved 20 km/h e-scooters are legal, and the SUNNIGOO N5 is our current ABE model. People also ask: Renfe allows compliant e-scooters on Spanish trains from September 2026 X10 flagship deep dive: 6000W and 100 km of range in Europe X2MAX 2400W dual motor: off-road value for European riders About SUNNIGOO SUNNIGOO is a European e-mobility brand and manufacturer serving riders across Germany, France, Spain, Italy, the Netherlands, Poland and beyond. We ship from EU warehouses in Germany, Poland and France with delivery in 3–7 working days, back every bike with a 2-year warranty on motor and frame, and run a dedicated service centre in Messel, Germany. Our vehicle platforms are built to European standards including CE EN 17128 for e-scooters and EN 15194 pedelec configuration for our 250 W e-bikes, and our German road-legal e-scooter carries ABE type approval — so you can choose a compliant vehicle from day one.