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Modern Hardtail with 120 mm Suspension Fork

“The new standard of high-performance hardtails with slacker head tube angles and longer suspension forks.”


The TOURMALINE is our Mountain Bike Hardtail that is specifically designed for long distance endurance missions. The dimensions and our frame manufacturing process ensures excellent vibration dampening characteristics for very good comfort on long and challenging rides.

The carbon fiber frame construction of the TOURMALINE is similar to the IOLITE. However, the new Tourmaline Plus has the possibility to be ridden as 29er bike or 650B+ bike. By designing the frame with the new Boost Standard rear section, we make sure that the bike is compatible with all important wheel and transmission standards.

The geometry of the TOURMALINE has been optimized for trail riding in challenging terrain. The slacker head angle and shorter chainstays in comparison to the IOLITE model are the foundation for a great riding experience in various conditions. Especially, on steep descents you appreciate the neutral and safe handling. We call this R.A.M. geometry. Ride and Race All Mountain.

You can also race on the TOURMALINE. Our prototype bike has won several races and was ridden by Markus Werner, the former MTB Cross-Country and Marathon Champion of Germany (2014/2015 in the masters class).


TOURMALINE frames can be individually fitted and constructed to your body measures. The Full Custom Option also entails the fitting of the bike to your individual needs when it comes to ride characteristics. From a race oriented geometry through a comfort oriented geometry all the way to a travel bike geometry for extremely long rides our portfolio offers optimization potentials which are based on bio-mechanic principles.



Size / Bike weight / Frame weight: Large / 8,8 kg / 1.100 g

Design Style and color: Konstructive Pure Carbon

Dream-Bikes for Dream-Rides

Custom Bikes offer more fun than standard bikes. Take our word for it. We have been riding them for 30 years.

• Most advanced fabrication methods
• Developed in Germany, handmade in Europe
• Custom sizes and tailor-made frame building with individual features available
• Custom colour and graphic design options available
• Excellent stiffness-to-weight-ratio
• Large selection of configurable options to create the ultimate Dream Bike

Ideal for



Advanced Cycling Skills and Endurance Training Programs are the perfect addition to your Dream Bike!


Video presentation of IOLITE and SMARAGD Hardtail Mountain Bikes that feature only a slightly different frame geometry and field of use.



Our Master Craftsmen build High-Performance Bicycle Frames with Premium Steels and Advanced Carbon Composite Materials from Europe.

Frame Geometry

Frame sizeSMLXL
Seat TubeA390430480530
Effective Top TubeB580600620646
Seat Tube AngleSa74°74°74°74°
Head Tube AngleHa69°69°69°69°
Chainstay LengthC430430430430
Horizontal ChainstayHC425425425425
Head Tube LengthS90100110120
Fork LengthF495495495495
Reach R409427443467
Measured in millimeters

Specifications and Frame Details

Modern and optimized frame tubes from composite materials specific to load
Frame design with sloping top tube for low frame weight and great handling characteristics
Compatible with rigid forks with tapered steerer tubes
Developed in Berlin; Germany; handmade in Europe
Low frame weight from 1.080 g
Load-specific carbon-layup; HR40 / M30
Durable 3K carbon-layup surface
Post-mount disc mount inside of rear triangle for 160mm discs
Internal shift-cable routing through down-tube. Easy service through service-port in front of the bottom bracket
Tire clearance for 2.35 inch tires (tested with Schwalbe Nobby Nic tires)
Removable derailleur hanger
Tapered head tube from 1 1/8“ to 1.5“; integrated standard (IS)
27,2 mm seatpost diameter; 400 mm length recommended
Seatpost clamp with 31,8 mm diameter
Front derailleur clamp with 31,8 mm diameter
„Top-Swing“ or „Bottom-Swing“ compatible with cable from below (Bottom-Pull)
Compatible with 1 speed; 2 speed and 3 speed systems
Compatible with SRAM Eagle chainring up to 34 teeth
73 mm wide Press Fit 30 bottom bracket with alloy interface
Rear axle system: 148 mm x 12 mm / 142 x 12 mm through axle system
Pure carbon with clear coat for the most robust and lightest surface
Custom colors are available for our Custom Dream Bikes
Konstructive Carbon-frames are completely repairable. In the Konstructive carbon lab we can also repair frames from other manufacturers

Dream-Bike Manufactory

Configure your ultimate Dream Bike. Our Konstructive Dream Bike Consultants will help you to select the right components and wheelsets from the best premium manufacturers. Based on your personal preferences we will design the look of your bike. Individual paint schemes and graphic designs are available for frames, forks, components as well as wheel systems. You can choose any component and groupset for your drivetrain, shifting and braking system that the market has to offer. We assist you in finding the best parts for your field of use and cycling goals. Just contact us any time to start your Dream Bike project.

Dream-Bike Configuration Tool

We create bikes based on your body dimensions, wishes and personal preferences.

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