Electric Assist Bicycle: Which to Choose? Latest Comparison and Optimal Solutions in 2025
In Japan, the motorcycle market is a place where mopeds and electric assist bicycles coexist. As of March 2025, the number of registered mopeds in Tokyo is about 1.5 million, while the number of electric assist bicycles is growing rapidly, increasing 23% year-on-year to 900,000 . In this article, we will thoroughly compare the "legal", "cost" and "practicality" of the two, focusing on the new Sptebik model. We will propose the best option for commuting, raising children and hobbies.
The crucial difference from a legal perspective
Having a license or not can change your life
For mopeds (50cc or less), you need to be 16 years old or older and have a moped license. On the other hand, Sptebik electric assist bicycles are classified as electric assist type, and anyone can use them immediately without a license. They also support bicycle insurance (TS mark) which will be mandatory in Osaka City from April 2025.
Comparison table of road driving rules
| item | scooters | Sptebik Electric Assisted Bike |
|---|---|---|
| maximum speed | 50km/h (legal) | 30km/h (maximum assist) |
| helmet | Obligations (fine for violations) | Optional (recommended) |
| Driving on the road | Required | Bicycle path available |
Comparison of total costs over 10 years
The truth about initial and maintenance costs
The purchase price of a Sptebik (after subsidies) is 118,000 yen. In comparison, the purchase price of a moped is:
- Vehicle price: 180,000 to 250,000 yen
- License acquisition fee: 8,500 yen
- Compulsory automobile liability insurance: 7,000 yen per year
The shocking difference between fuel costs and electricity costs
For a moped (fuel economy 40km/L), gasoline costs about 2,250 yen for 300km per month. For a Sptebik, electricity costs 45 yen for 100km (135 yen per month) . Over five years, the difference is about 126,000 yen.
Comparison of innovations in performance
Three evolutions of the Sptebik beyond the moped
- Range : 100km (5 hours per charge) → 160km with the average fuel tank capacity of a moped (4L)
- Load capacity : 180kg load capacity → Standard load capacity for a moped is 60kg
- Quietness : Motor noise 41dB (similar to a library) vs. moped engine noise 75dB
Demonstration data on terrain adaptability
Sptebik's 48V 500W motor + Shimano 7-speed transmission allows you to travel at the same speed as a moped at 20km/h on the average gradient of 8% on the slopes of central Tokyo. It can also climb steadily on the Gozan no Okuribi course in Kyoto (gradient of 15%) .
A guide to optimal choices for each lifestyle scenario
For Commuters | 24km/h Speed Limit
Sptebik allows you to use bicycle paths, so you can choose a route without traffic jams. For the Shinjuku to Shinagawa (8km) route, it takes 25 minutes by moped vs. 28 minutes by Sptebik, so there is not much difference. Bicycle parking fees (5,000 yen per month vs. 2,000 yen per month) are also an advantage.
Outdoor enthusiast | Expandable
A camping trailer (maximum towing 80 kg) can be added as a genuine option. In a test run on a mountain pass in Nagano Prefecture, the vehicle cleared an elevation difference of 500 m with only 40% battery power remaining .
