THE HIISI PLATFORM
One frame. 152 to 200 mm. Your terrain.
A range that would require four separate bikes from any other manufacturer. We do it with one frame.
The industry sells categories. We engineered a platform.
Pole defined the modern long-travel geometry with Evolink — before the industry followed. Machine, Stamina, and Onni proved the direction for long-travel enduro at the highest level. Onni introduced the world’s first modular frame architecture for mountain bikes.
The Hiisi takes modularity further. Every dimension, every curve, every wall thickness designed from first principles and machined to ±0.05mm. A frame that adapts to its rider — not the other way around.
This is not iteration. It’s a new starting point. Designed by Leo Kokkonen — one engineer, one vision.
See it change.
Pick travel, wheels, size and finish. Watch the bike shift.
Four suspension configurations from one frame. The Hiisi platform covers 152 mm to 200 mm of rear travel — a range that would require four separate bikes from any other manufacturer.
Changing configuration doesn't mean bolting on longer parts and hoping the geometry works. Every travel setting has been engineered with its own kinematics, head angle, and bottom bracket height. The frame doesn't adapt by accident. It adapts by design.
One frame. Twelve characters.
Every configuration has its own geometry, kinematics, and personality. The wheel setup shifts the balance. Pick the combination that matches how you ride.
| 29" | Mullet | 27.5" | |
|---|---|---|---|
|
Trail
152 mm
|
Light, efficient, built to climb and flow. | — | Lightest setup. Quick, nimble, more playful. |
|
All-mountain
173 mm
|
The allrounder. Goes anywhere, asks nothing. | Playful when you want it, planted when you need it. | Lighter, lower, throws into corners on command. |
|
Enduro
180 mm
|
All-mountain with more room underneath. Rough and fast. | The same confidence, more clearance when it counts. | Nimble and forgiving over rocks you'd rather not see. |
|
Gravity
200 mm
|
Bike park velocity. Flat out, full confidence. | Throws shapes between the tape. DH with swagger. | Lightest gravity build. Pure commitment. |
Full 29"
Mullet
| K1 | K2 | K3 |
|---|
The rear axle stays where you designed it.
The Hiisi uses a low-pivot suspension layout. The reason is simple: geometry should be consistent throughout the travel.
Consistent cornering geometry
The rear axle follows a path that preserves geometry throughout the travel. Wheelbase, weight distribution, and steering characteristics remain consistent from sag to full compression.
Unrestricted rear travel
When the axle path preserves geometry, rear travel becomes a tuning variable rather than a constraint. The 200mm configuration delivers more rear travel than the front fork.
Direct drivetrain path
Chain runs directly from motor to cassette. Every watt reaches the rear wheel without detours. Efficiency scales with power output.
Four configurations. Individually engineered kinematics. Changing travel on the Hiisi doesn't just add millimeters — each configuration has its own leverage curve, tuned for its intended use. The data below is from our simulation models, validated on the trail.
A full-suspension mountain bike is fundamentally different from a rigid vehicle. The rider is the dominant mass — and that mass is dynamic. Geometry and kinematics must work together because the dynamic riding position is what matters most. We've optimized every kinematic parameter to complement the geometry, based on years of development and a clear design philosophy.
Progressive leverage is deliberate. High initial ratio means sensitive small-bump response. The progressive drop through mid-stroke provides support for pedaling and cornering. At full travel, the falling ratio resists bottom-out without harsh end-stroke. Click each configuration above to see how the curve adapts to its intended use.
The kinematics are on the Platform page. Here’s why they are what they are.
Progressive leverage
Progressive leverage ratio delivers sensitive initial travel, natural mid-stroke support, and smooth bottom-out resistance.
Anti-squat: effective, not excessive
Starts around 107% at sag — enough to resist pedal bob without locking out suspension response. Drops steadily through the travel for consistent traction under power.
Low anti-rise
Low and consistent anti-rise keeps the rear wheel active under braking. On steep descents, this prevents the head angle from steepening excessively.
Dynamic geometry
Static geometry is a starting point. The real optimization happens in the turn, on the descent, with the rider’s weight distribution. Video consultation and personal tuning are part of the ownership experience.
Why 7075-T6 aluminum.
7075 was developed in 1943 for aircraft structural applications. It remains the highest-strength aluminum alloy in wide commercial use — the standard material for aerospace load-bearing components, military hardware, and precision tooling where fatigue life and strength-to-weight are non-negotiable.
It’s also one of the most difficult aluminum alloys to work with. It cannot be welded without destroying its temper. It requires precision machining and controlled joining methods. This is exactly why we chose it — our manufacturing process was designed for materials that reward precision.
7075-T6
Strongest commercial aluminum alloy. Aerospace, military, precision tooling. Cannot be welded without destroying temper — requires precision machining and controlled joining.
6061-T6
Industry standard. Easier to weld, cheaper to produce. Lower strength and fatigue resistance.
Carbon fiber
Not one material — every layup is different. MTB frames reinforced for impact resistance, rarely light in practice. Epoxy is brittle, molecular structure degrades under cyclic loading, damage is invisible.
MODULAR BY DESIGN
Every linkage part is a separate, replaceable component. No pressed-in assemblies. No proprietary tools. The Hiisi is designed to be serviced, modified, and upgraded — not replaced.
Patented axle system
Dual bearings controlled by precision axle tolerances. Press-fit retention that won't loosen. Shouldered stops that prevent over-tightening. No shims. No spacers to lose during service.
Integrated extractors
Every linkage mount has built-in extractors — like quality cranks. No blind bearings, no impact tools. Disassembly is as precise as assembly.
Controlled rear stiffness
Rear triangle stiffness is governed by a precision axle in the front triangle. Round geometry enables exact FEA simulation — stiffness is calculated, not guessed.
Internal capacity
Water bottle or range extender fits inside the front triangle — even in the smallest frame size. No compromises on hydration or e-bike range.
Your Hiisi doesn't lock you into one setup. It evolves with you.
One person designs the geometry, the kinematics, and the frame structure. No committee.
Leo Kokkonen
Every geometry table, every kinematic curve, every structural analysis on the Hiisi comes from one desk. Leo designs the frame from pivot placement to wall thickness, runs the FEA, validates the kinematics, and tunes the final product on the trail. The Evolink geometry that changed the industry. The Machine that proved CNC frames. The Onni that won at World Cup level. All the same engineer.
Continue
The platform is the starting point. See how it's made — or make it yours.