google-site-verification: googlee29ffadc747dbc13.html



by S-TEC sports working together with Brose ,Yamaha and Shimano


-BROSE Power

The pedelec electric motor developed by the German automotive supplier BROSE forms the basis for our IPU. In electrical engineering terms, it involves a “brushless internal rotor”, which is characterized by an extremely compact design combined with high efficiency. The power from the electric motor is transmitted in two stages in a ratio of 1:27. In the first stage, a planetary gear with a transmission ratio of 1:9 is connected before the motor while transmission in the second stage takes place in a ratio of 1:3 via a belt drive. This transmission ratio is necessary so that the electric motor (driven by the rider’s relatively low pedalling frequency) always rotates within its optimum speed window in order to guarantee a high efficiency. This means that the electric motor always rotates within its optimum window of revs, guaranteeing high efficiency. Another unique design feature of the Brose motor is the use of two freewheel mechanism in the interior. This is very important in the case of pedelecs with a legally prescribed cut-off speed at 25 km/h. With the aid of the second freewheel mechanism, the electric motor disengages entirely once the 25 km/h limit has been exceeded so that the rider can continue to accelerate the bike with muscle power and without any loss in forward drive.

Brose has continued to optimise the motor in the new Brose Drive S (available from MY 2018). The increased efficiency and the new thermal design increase the power output. The torque curve has been specially adapted for use in sport and the responsiveness has been improved for technical terrain so that uniform support is always provided and everywhere becomes accessible by bike.

Battery designed in collaboration with a German battery producer

We designed the battery unit in collaboration with a German battery producer. Essentially, the battery consists of four basic elements: the 40 Li-ion cells, the battery management system (BMS) with cable harness and motor connector, the integrated charging socket and the housing that encloses and protects the entire battery unit.  

Two different batteries are offered as of the 2018 model year:
The IPU.500.ALUMINIUM has a total capacity of 518 Wh. It is completely integrated into the aluminium bottom tube and is permanently installed in the frame. The battery consists of 40 lithium-ion cells (model INR18650 MH1), divided into 4 packs of 10 cells. Each cell provides 3,600 mAh. The IPU.500.ALUMINIUM will be used in all CORE models as standard. The IPU.R.660.CARBON has a total capacity of 648 Wh. The battery is integrated into a carbon bottom tube, is removable and can be charged both on and off the bike.

The IPU.R.660.CARBON has 50 premium lithium-ion cells (model 18650), where each cell provides a voltage of 3.6 volts (ranging from 4.2 to 3.6 volts) with a capacity of 3,600 mAh. What makes these lithium-ion cells special is their inner chemical make-up which was specifically designed for use in electric bikes and the automotive industry. The IPU.R.660.CARBON will be used in all Ultra and Pro models as standard. The IPU.R.660.CARBON is backwards compatible and can be integrated into all ROTWILD/Brose hybrid models. 

IPU integration into various bicycle designs

Our IPU is designed in such a way that we can use it in all bike categories or ranges without any great restrictions in geometry, kínematics or compatibility, i.e. from ROTWILD MTB Cross Country via All Mountain to Enduro; yet at the same also in the multifunctional Tour or Trekking Bike sector. To this end, the motor housing becomes a permanent part of the frame, firmly bolted to the bottom tube battery and unit and the frame – the bottom tube battery unit becomes a supporting element within the frame structure. The compact design additionally enables us to achieve short chainstay lengths or appropriately position the pivot points which are important for the development of full-suspension frames.


-SyncDrive Pro powered by Yamaha

 engineered for high-performance E-bike riding. Giant tuned it to make it more powerful, and this lightweight, compact motor is used primarily on Giant’s high-performance E-bike models.

The new SyncDrive Pro offers 5 support modes (Eco, Basic, Active, Sport and Power) and powerful assistance with a maximum support ratio of 360%. This means that, in the Power mode, 100% of human torque input offers 360% of pedal-assist.

For performance-minded riders, this motor offers 80Nm of powerful support up to 120 max rpm in the two upper support modes (Active, Sport, Power). The rider experiences no power loss while reaching higher levels of cadence, making steep climbs more accessible and comfortable. At the two entry support modes, the rider is rewarded with 110 max rpm and 80Nm of motor torque.

SyncDrive Pro is tuned to give quick and direct response to pedaling. It delivers 100% of 80Nm of motor torque in less than 19 milliseconds. Both the ISIS bottom bracket interface and clutch have been updated to provide a quicker, more direct response. Backlash of the ratchet mechanism is reduced by one third, and a hollow axle shaft creates a quicker, more direct response.

Lightweight and compact

The new SyncDrive Pro offers 5 support modes (Eco, Tour, Active, Sport and Power). With reduced weight (380 grams lighter than the SyncDrive Sport and Life) and reduced volume (13% less volume compared to SyncDrive Sport and Life), the new SyncDrive Pro motor is ideal for high performance E-bikes. The light and compact motor allows:

Clean lines
Next-level integration
Maximum ground clearance

A hollow axle shaft is used to reduce weight while a 128mm ISIS interface BB allows for a narrower Q factor to fit MTB standards


-Shimano Steps E8000

SHIMANO STEPS MTB is a system of components that are installed on an e-bike. It offers you intuitive trail support, but with the feeling of riding a normal mountain bike.

Powerful SHIMANO STEPS motor is strong enough to handle the steepest of trails, yet intuitive enough to give you just the right amount of support every pedal stroke along the way.

  • Designed specifically to give you that natural feel of riding a normal MTB.
  • Weighs only 2.8kg, one of the lightest motors on the market.
  • Stable, smooth intuitive power for improved bike handling over every section of trail.
  • Solidly supports speeds up to 25 km/h.

Lightweight yet rigid crankset for direct power transfer. Both crankset and rest of the drivetrain built on SHIMANO’s proven technology. This gives you reliability and confidence from first to last pedal stroke.

  • Drivetrain components designed to work in sync with each other for unparalleled effectiveness and reliability.
  • Spec’d with SHIMANO Hollowtech II bottom bracket for added strength and direct power transfer.

The Firebolt Switch Unit control with intuitive operation is ergonomically designed for a MTB. It’s the ultimate in comfort and reliability as you switch between modes while blasting through the trails.

  • The e-MTB Switch Unit (SW-E8000-L) is ergonomically designed for the specific demands of MTB riding such as riding through tight singletrack and bumpy terrain.
  • Accurate, smooth shifting between power-assist modes regardless of weather or terrain conditions.  
  • Switch between Boost, Trail, Eco and Walk settings in a flash during the ride. 
  • Shifters incorporate the same design and shifting feel as XT Di2.

Extensive choice of power-assist settings to match your unique riding style. Compact, easy-to-read display with dynamic visuals when switching between support settings.

  • Further personalize your support settings by choosing Dynamic, Explorer or Custom Mode to perfectly match your riding style and intended terrain.
  • Computer specifically designed to be compact and durable for MTB riding.
  • Easy-to-read LCD - each support setting assigned a unique colour. 
  • Sleek bar-mounted computer with dynamic LCD display shows gear number, power assist mode and battery range information. 
  • Wirelessly customise your preferences via Bluetooth.

Ultra-durable, powerful battery specially designed for the rigors of mountain biking.

  • MTB-dedicated compact, low profile design for improved impact and vibration resistance.
  • High capacity long-lasting Li-Ion battery of 504 Wh to cover more territory.
  • Supported travel up to 100 km on one charge. 
  • 1,000 charge cycles with no significant power loss.