24.08.2012 New Product 2013 ....more 25.08.2011 Gruber Antrieb GmbH & Co KG introduces VIVAX – A REVOLUTIONRY CONCEPT ....more


Sophisticated motor power is hidden in the bike‘s seat tube. It only weights 1.8 kg (inkl. battery). Press the button and the motor delivers 200 watts to the crankshaft. Press the button again and the motor stops. Without motor power the bike functions as normal without any kind of resistance. The Lithium-Ion  high-performance battery, which fits into a conventional saddlebag, provides you with motor-assisted cycling lasting for min. 70 minutes (5.5 Ah) or min. 100 minutes (8.25 Ah). The special design of the drive unit allows it to be built into any bicycle frame with the requisite seat tube internal diameter of 31.6 mm or 30.9 mm and is therefore invisible on the bicycle – except the on/off switch, which is unobtrusively located on the bar end.

Suggested retail price incl. tax
incl. 5,5 AH LiIon battery and charger 3 A: 2.550,00 EUR

Installation: 159,00 EUR

Complete system (PDF)


State of the art technology has been incorporated into the intelligent control electronics. Communication between motor and cyclist is extraordinary. The support power will increase when the treadling power of the rider decreases and vice versa. Storage process for highest and/or individual frequency (between 15 and 90 rpm) is possible - bush the buttom whilst riding. The particularly short and compact design allows for its installation in special seat posts and especially small bikes (short seat posts)! The reading and programming of the electronic control is possible at any time, without removing the unit, with a special computer-program.
  • Electric Bicycle


The auxiliary drive, with a length of almost 22 cm and 200 watts of power, is permanently connected torque-proof with the crank through a bevel gear unit; gear changing is still possible. Thank to the free-wheel you continue cycling as normal, without resistance, when the drive is switched off. When the system is on, the personal contribution gets supported by the vivax assist with 200 watts extra power, you have to pedal furthermore. A optimal performance-output is from 60 rpm. The cycler will be supported till 90 rpm. With the help of a clever and patented special tool, installing the retrofit kit is child’s play. Errors in assembly are therefore virtually eliminated!
  • vivax retrofit kid
  • Electric Bicycle


LiIon battery cells of the latest generation. Mini design with a sensational
weighting. All types 30 V.
5,50 Ah, 70 mins running time at least;
Dimensions: 120x70x70 mm, 850 g.
8,25 Ah, 100 mins running time at least;
Dimensions: 135x85x70 mm, 1250 g.
Battery parameters are recorded in the system.
  • vivax sattle bag