How EV4 was born?
Since birth I live in Europe in the Polish capital of Warsaw. Moving within Warsaw, which from year to
year is becoming more and more congested, I lacked alternative means of transport, which could easily get
around street jams. I could simply not accept the daily, pointless and costly waste of time. I began to
think about the development of an innovative vehicle that would allow for faster urban transport. I made a
list of my expectations and I came to the following conclusions:
The vehicle had to be:
- Faster than a bicycle,
- Have its own propulsion,
- Be a product of high quality,
- Long range driving capability without the need to recharge or
- Cheap in operation,
- Handy for elevator, office, home, subway, etc.
- Small enough to ride on bike lanes, parks, forests etc.
- Must be eco-friendly and without emissions,
- User-friendly and pleasing to drive,
- Have better stability than classical two wheelers, bikes or
While searching for a solution, which would combine all these qualities, I came to the conclusion that the
mass of the vehicle would be around 50 kg, with dimensions similar to a bicycle incl. an electric drive.
One key problem remained, however: How would one increase the vehicle's stability compared to that of a
bicycle? How could we increase the stability of a 4 wheel drive vehicle while keeping the dimensions fit
for a bike road and at the same time eliminate any tendency to derail in curves. I started looking for a
technical solution that would combine the advantages of a single track and double track vehicle. Following
aeronautics, which use control units in small airplanes, it was on that basis that I decided to design an
innovative suspension system, which is now implemented in the EV4. Thus the EV4 is a 4 wheel drive
vehicle, which can tilt just as a traditional bicycle.
From the very beginning the EV4 was designed and constructed just like an airplane. Hence, I aimed at a
low weight. Nearly all components are made of highly durable aeronautical aluminum alloy. An interesting
fact is that the main frame of the vehicle is riveted just like in the case of airplanes. This approach
makes the main frame even more durable and lightweight. The independent suspension is an adaptive
suspension system. It is designed to adjust to the shape of the terrain at any given moment. Regardless of
the surface type, terrain, angle of inclination of roads and travel, the EV4's wheels uniformly and evenly
touch the ground. Thanks to the electric drive as well as gear belts the noise emission is close to zero,
which has a positive effect on the driving comfort. The vehicle's low weight and the use of modern and
efficient lithium ion batteries achieved an unparalleled driving range. Shocks are absorbed by two bicycle
shock absorbers with adjustable hardness and damping. Hydraulic disc brakes on 4 wheels allow for very
short braking distances, making the EV4 very safe. Driving this vehicle delivers unbelievable impressions.
It is driven with utmost ease. The EV4's four wheels result in an unparalleled stability, superior to that
of single-track vehicles.
EV4 CITY QUAD
Drive: 2x 800W DC motor
Battery: Li-Ion 36 V, 53 Ah
Brakes: hydraulic discs on 4 wheels
Width: 60 cm
Length: 150 cm
Height: 110 cm
Weight: 41 kg without battery, 53 kg with battery
Range: 90-130 km
Speed: max. 35 km/h
Suspension: 2 bicycle shock absorbers
Tires: 47-305 (16 x 1.75)
Transmission: toothed belts
Mechanical tilting system
Aviation grade aluminum frame
Welded aluminum swingarms