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//  FREAK compact bike - just youthful!

Freak compact bike (Alfine)
In collaboration with young athletes of the teenage sports group Wheelers of the sports clubs MTV Stuttgart and RSKV Tuebingen, we have developed an outstanding teenage handbike. The FREAK compact bike consists of a drive unit and a stable girder chassis, which can be separated for transportation within seconds. Its easy handling, dimensions and optimised weight are specially designed for the success and fun of our young customers. The ideal sports equipment for children and teenagers who enjoy exercising.

With its adjusted steering geometry, long wheelbase and even weight distribution the FREAK bike has excellent handling characteristics. Top-quality gear and brake components from the bicycle industry ensure for precise changing of gears and braking. The handbike equipment is variable, from touring bike to sports bike.

The back angle can be adjusted without any tools. That way it can also be quickly adjusted to your needs when you are on the road. The FREAK can be extended to make an NJ1 compact bike or adaptive bike using the modular system.
Light weight from 14.8 kg
  • Low travel effort.
  • Easy loading and transportation.

Can be disassembled easily
  • Drive unit and chassis can be taken apart in seconds using excentric quick-lock system without any tools.
  • Rear wheels can be detached via quick-release axle.

”Adaptation” function/optimum adjustment to the user's requirements and abilities
  • By exchanging the bottom bracket support and adjusting the seat and back system, customisation is possible at all times.

Double-use function on wheelchair and chassis possible
  • Temporary changes between adaptive bike and recumbent bike possible (this must be tested to see whether this is possible with the user's impairment).

Selection of different gear shift systems
  • Derailleurs: Shimano Deore 27-speed, Shimano Deore XT 27-speed, Shimano Deore XT DYNA SYS 30-speed.
  • Hub gears: Shimano Nexus Inter 7 (7-speed), Shimano Nexus Inter 8 (8-speed), Shimano Alfine 11-speed, Rohloff 14-speed.
  • More components upon request.

Effective brakes
  • Shimano V-Brake rim brake.
  • Hydraulic disc brakes.
  • Back pedal brake.

Continuously adjustable and fold-down (optional) backrest
  • Its tilt angle can be adjusted continuously without any tools.
  • Horizontally adjustable for optimum sitting position.
  • Folding down the back rest (option) will result in a small pack size.

Aluminium backrest
  • Increased free moving space thanks to the reduction of the upper part of the backrest.
  • Provides defined pressure point allowing for optimum transmission of the power of the upper part of the body to the crank.
  • Ideal base for custom backrest.

”Open belt system” seat upholstery
  • By adjusting the cross straps the pressure distribution can be controlled individually and crank positioning can be influenced.

”Body Contour” seat and back upholstery
  • Very breathable and light.
  • The suspension effect automatically ensures for even pressure distribution.
  • On uneven ground (e.g. cobblestones, rough terrain), shocks to the spine are significantly reduced and intervertebral discs protected.

Extensive Tetra equipment
  • Flip or chin gear shift, back pedal brake for hub gears and derailleurs, crank freewheel, Tetra shell handles, Tetra grip forks and much more.

BionX and neodrives drive systems possible
  • With a support of up to 300% and speeds of up to 24.9 km/h (15.5 mph).
  • Speeds of up to 6 km/h (3.75 mph) using the thumb switch without pedalling.
  • With the neodrives drive system you can also switch on a downhill assistant that automatically sets the ideal recuperation level.

Wide range of accessories
Possible types recumbent bike, long seat
Total weight from 14.8 kg
Max. load weight Standard up to 100 kg user load capacity; more than 100 kg upon request!
Possible drive wheel sizes 20″, 26″
Possible running wheel sizes 20″, (26″ only after examination of available arm room)
Possible running wheel camber 1°, 4°, 6°
Materials and manufacturing 
  • High-strength aluminium alloys for a very high degree of frame rigidity and low weight.
  • Resistant powder coating and anodised surfaces for an attractive design and scratch resistance.
  • Component groups are CNC-machined inhouse and ensure the highest level of stability and accuracy of fit.
  • Precision brand bearings for handbike durability and reliability.
  • As a result of the high manufacturing depth individual customer requests are able to be dealt with.
  • Custom-made models are possible upon request.
Pack size Chassis from 102 x 46 x 37 cm;
drive unit from 99 x 43 x 50.8 cm
Grip sizes 40 cm, 45 cm; other grip sizes upon request.
Crank lengths 135 mm, 155 mm, 175 mm, custom-made
Standard height of bottom bracket from the ground (20″ wheels) Bottom bracket support size S: 57 cm; bottom bracket support size XS: 51.5 cm; custom-made bottom bracket supports as per order.
Distance of frame bottom to ground/ground clearance (20″ wheels) 6 cm front; 9.5 cm rear
Seat height (20″ wheel, seat cushion 3 cm, seat upholstery without slack) 13 cm
Frame length (outer frame edges front - back) 102 cm
Frame width (outer frame edges left - right) 39 cm
Seat width (inner frame edges left - right) 35 cm
Rear wheel axle width 46 cm
Total bike length (20″ wheels, no leg rest) 180 cm
Total bike width (20″ wheels, 1°camber) 53.5 cm
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PROACTIV GmbH Rehatechnik PRO ACTIV Reha-Technik GmbH
Im Hofstätt 11
72359 Dotternhausen
Tel +49 7427 9480-0