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//  Tetra Equipment - Hub Gears: Components

Shimano Nexus Inter 7
Shimano Nexus Inter 7
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You can shift gears at any time, even while standing still. Reliable shifting hub with 7 gears and back-pedalling brake. Default operation via Shimano Revoshifter twist grip shifter.
 
Gears7
Chain rings/ pinions32 / 20 teeth
Gear ratio of lowest/highest gear1:1,01/ 1:2,47
Gear range244%
Back-pedalling brake/Back freewheelBack-pedalling brake
Shiftingmanual
SuitabilityLeisure
Ease of running
average
Robustness/Life
good
Comfort
excellent
Required maintenance+
Operation+
Shimano Nexus Inter 8
Shimano Nexus Inter 8
Gallery
Reliable shifting hub with 8 gears and back-pedalling brake. In combination with gearshift servo technology, shifting is quick and easy, even under heavy loads. The reduced free-gear angle allows for smooth, clean shifting. As standard, operated via the Shimano Revoshifter twist-grip shifter.

As an alternative, operation can also be carried out using the PRO ACTIV automated controller. Gear changes can also be carried out using the chin. To change up move the gear lever 45° up and to change down move it 45° down. After completing the gear change, the gear lever moves back to its starting position.

You can shift gears at any time, even while standing still.
 
Gears8
Chain rings/ pinions32 / 20 teeth
Gear ratio of lowest/highest gear1:0,84/ 1:2,58
Gear range307%
Back-pedalling brake/Back freewheelBack-pedalling brake
Shiftingmanual
SuitabilityLeisure
Suitability for tetraplegicsTwist-grip shifter or PRO ACTIV automated controller
Ease of running
good
Robustness/Life
excellent
Comfort
excellent
Required maintenance+
Operation+
Shimano Alfine di2
Shimano Alfine di2
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Highly efficient electrical 11-speed hub gear with LED display and an independent power supply. Large gear ratio range and free-wheel. Combined with the hydraulic back-pedalling disc brake, there are no lines or cables on the handles.

Gear changes are made using electrical buttons that can also be operated with the heel of your hand or the chin. The gear engaged is shown on the display. You can shift gears at any time, even while standing still.
 
Gears11
Chain rings/ pinions32 / 20 teeth
Gear ratio of lowest/highest gear1:0,84/ 1:3,44
Gear range409%
Back-pedalling brake/Back freewheelBack freewheel
Shiftingmanual, electric
SuitabilityLeisure
Ease of running
good
Robustness/Life
excellent
Comfort
outstanding
Required maintenance+
Operation++
BionX IGH3 for NJ1 e-assistant
NJ1 e-assistant with BionX IGH3 3-gear system
Gallery
The 3-speed hub gear for the NJ1 e-assistant. You can shift gears at any time, even while standing still. As standard, operated via the SRAM Grip Shift twist-grip shifter.

As an alternative, operation can also be via the PRO ACTIV automated controller. Gear changes can also be carried out using the chin. To change up move the gear lever 45° up and to change down move it 45° down. After completing the gear change, the gear lever moves back to its starting position.

You can shift gears at any time, even while standing still.
 
Gears3
Chain rings/ pinions32 / 19 teeth
Gear ratio of lowest/highest gear1:1,24/ 1:2,29
Gear range186%
Back-pedalling brake/Back freewheelBack freewheel
Shiftingmanual
SuitabilityHobby; Only in combination with NJ1 e-assistant with BionX IGH3
Suitability for tetraplegicsTwist-grip shifter or PRO ACTIV automated controller
NotesWe recommend: Use the Mountaindrive to double the gears.
Ease of running
good
Robustness/Life
excellent
Comfort
excellent
Required maintenance+
Operation+
BionX IGH2 Automatic for NJ1 e-assistant
BionX IGH2 Automatic
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The automatic 2-speed hub gear for the NJ1 e-assistant. You drive up to 12-16 km/h in first gear. Above 15 km/h, the gear changes automatically to the second gear. Combined with the hydraulic back-pedalling disc brake, there are no lines or cables on the handles.
 
Gears2
Chain rings/ pinions32 / 19 teeth
Gear ratio of lowest/highest gear1:1,68/ 1:2,29
Gear range136%
Back-pedalling brake/Back freewheelBack freewheel
Shiftingautomatic
SuitabilityHobby; Only in combination with NJ1 e-assistant with BionX IGH2.
Suitability for tetraplegicsGear change is carried out automatically.
Ease of running
excellent
Robustness/Life
excellent
Comfort
outstanding
Required maintenance+
Operation++
 
 
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PROACTIV GmbH Rehatechnik PRO ACTIV Reha-Technik GmbH
Im Hofstätt 11
72359 Dotternhausen
Tel +49 7427 9480-0