Paratu CP
"This is the paradox of the Concentric Pivot — you get 97% anti-squat for pedalling efficiency, yet the suspension remains fully active over small bumps. Normally these are contradictory goals. High anti-squat means a stiff, unresponsive rear end. But with this architecture and the flat leverage ratio, you achieve both simultaneously. I have never seen this on another platform."
— Fil Palmer (@ebikeitalia6832) — CP Platform Kinematic Paradox Analysis, from video review 2024
Independently validated: ~100% anti-rise at sag | 97.3% anti-squat | 3.0–3.5° pedal kickback | K-Volve full analysis →
Carbon eMTB Enduro — Concentric Pivot
“Paratu” means Lightning in the Taiwanese indigenous Bunun language. Lightning for speed. Lightning for electricity.
The Paratu CP is a full carbon monocoque enduro eMTB frame kit built around the Maxon Bikedrive AIR S — the same motor chosen by a small group of rider-owned bike makers. We co-developed this integration with Maxon from 2020. Now we build directly for you — factory to rider, no middlemen.
At a Glance
| Motor | Maxon Bikedrive AIR S — 90 Nm, 620 W peak |
| Battery | 400 Wh in-tube + optional 250 Wh range extender (650 Wh total) |
| Frame | Full carbon monocoque, ~2,490 g (size/color dependent) |
| Engine System Weight | 3.7 kg (motor + battery + HMI + crankset) |
| Complete Bike Weight | 16.9 kg (SL Trail build) – 19.5 kg (full enduro coil) |
| Head Angle | 63.9° at 150 mm fork · 63.7° at 160 mm fork · 63.5° at 170 mm fork |
| Seat Tube Angle | 77.8° at 150 mm fork · 77.6° at 160 mm fork · 77.5° at 170 mm fork |
| Rear Travel | 145 / 150 / 160 / 165 mm (230 mm eye-to-eye shock) |
| Fork Compatibility | 150–170 mm |
| Wheels | 29″/29″ or 29″/27.5″ mullet (geometry-preserving flip chip) |
| Sizes | S / M / L — with RA Reach Adjust headset (±5 mm per size) |
| Warranty | Lifetime frame (3 yrs carbon, original owner) · 2-year Maxon BIKEDRIVE system (engine, battery, HMI, mode shifter, speed sensor) · Crash-replacement for life · Second-owner goodwill after registration |
| Price | From $6,589 USD / €5,990 EU (frame kit with motor system) — free worldwide DDP shipping |
Descending: Concentric Pivot
CP stands for Concentric Pivot. The horst link sits at the centre of the rear axle rather than in front of it. This isolates the suspension from braking forces entirely, producing a bottomless feel that inspires confidence in steep, rough terrain.
Paired with a 63.5–63.9° head angle (varies by fork travel — 150 / 160 / 170 mm) and our K-Volve kinematics, the Paratu CP is stable at speed, composed through chunk, and planted through corners — exactly what aggressive enduro riding demands.
Climbing: Maxon Efficiency
The Maxon Bikedrive AIR S was engineered with Swiss precision — inspired by the same motor technology behind NASA’s Mars rover and Ingenuity helicopter. At 90 Nm and 620 W, it delivers serious power. But what sets it apart is efficiency.
- Tuned for MTB-specific cadence averaging 65 RPM
- Near-zero drag when the motor is off — the gears retract from the driveshaft
- Three ride modes (Eco, Trail, Boost) customisable via the Maxon app
- ANT+/Bluetooth for GPS watches and bike computers
With the 400 Wh in-tube battery, expect 2–5 hours of ride time depending on terrain and mode. Add the 250 Wh range extender (just 1.4 kg in a bottle cage) for up to 650 Wh total — enough for full-day alpine adventures or weekend park sessions.
On the Range Calculator, the Maxon system retains 41% battery after a 1,000 m climb with the range extender — outperforming significantly heavier systems from competitors.
Make It Yours
- Travel: Four rear travel options (145/150/160/165 mm) via shock stroke length. Compatible with 150–170 mm forks.
- Wheels: 29″/29″ or mullet 29″/27.5″ via the geometry-preserving yoke flip chip.
- Reach: Fine-tune with the RA headset system — 0, -5, or +5 mm positions.
- Cable routing: Internal for clean looks, or external for easy serviceability.
- Colors: Standard finishes — Gloss UD, Matte UD, Gloss Black, Silver Metallic. Full custom Pantone colors: +$384 Single Solid / $494 Metallic / $604 Two-Tone — see Paratu CP custom colours.
- Decals: Black or brushed rainbow silver (HRTF), applied under clearcoat.
Pick your rear travel
Same chassis, four shock-stroke configurations. Frame price is identical across all four — most shocks adjust between strokes via clip / washer changes.
Super-light trailbuild possible at this travel. Quickest, most efficient feel of the four.
Versatile balance of climb efficiency and descent capability. The default we recommend if you're not sure.
Bottomless feel on big hits. Pair with a 170 mm fork. The right call for aggressive trail and bike-park days.
Mini-DH and full enduro feel. Pair with a 170 mm fork. For riders who push the bike on steep, sustained terrain.
Wheel combo (29/29 or 29/27.5 mullet) is rider preference — all four travels work either way.
Pick your rear travel
Four travel options on the same K-Volve / Concentric Pivot frame. Configured via shock stroke length — same eye-to-eye, different stroke. Pair with a 150 / 160 / 170 mm fork to dial the geometry.
Lightest possible build. Fast, flowy terrain. Pair with a 150 mm fork — head angle 63.9°.
The do-it-all setup. All-day trail, mixed terrain. Pair with a 150–160 mm fork.
Bottomless feel through chunk. Aggressive trail and enduro. Pair with a 160–170 mm fork.
Steep, fast, aggressive. Bike-park-leaning enduro. Pair with a 170 mm fork — head angle 63.5°.
Lead times
- Stock-colour Paratu CP: 3–4 weeks based on current production, subject to Maxon engine-system stock.
- Custom-colour Paratu CP: 5 weeks (confirmed CAD drawing + downpayment required to start).
Maxon Bikedrive AIR S Components
Every Paratu CP frame kit ships with the complete Maxon system, ready to build:
Drive Unit
2 kg • 90 Nm • 620 W
In-tube Battery
1.8 kg • 400 Wh • 3 hr charge
HMI Display
Integrated processor • Mode indicator
Mode Shifter
Magnetic • By Zirbel
Also included: E13 Core crankset with direct-mount 32T/34T chainring and 104BCD 4-arm spider.
Frame Kit Includes
- Full carbon CP frame
- Maxon Bikedrive AIR S motor
- 400 Wh in-tube battery
- HMI display + mode shifter
- E13 Core crankset + 32T chainring
- RA Reach Adjust headset
- UDH hanger (Universal Derailleur Hanger)
- Internal cable routing kit
Battery & Range
The Paratu CP ships with a 400 Wh in-tube battery. For extended range, add the 250 Wh range extender (sold separately, $769 USD / €699 EU) — it mounts on your bottle cage bosses and adds just 1.4 kg.
- 400 Wh: 2–3 hours of trail riding in mixed modes
- 650 Wh (with range extender): 4–5+ hours, full-day alpine rides
- Analog mode: Switch off the motor and ride it like a pedal bike — near-zero drag thanks to Maxon’s gear retraction system
For detailed range comparisons against every major eMTB system, see our Range Calculator. For a deep dive into the battery architecture, visit Battery System.
The Paratu Family
The Paratu platform comes in multiple configurations for different riding styles:
Paratu CP
Concentric Pivot enduro
145–165 mm rear travel
You are here
Iuhu CP
Concentric Pivot pedal bike
Same kinematics, pure pedal power
From $3,179 USD / €2,890 EU
Paratu FLX
Flex-stay trail
Lightweight simplicity
Coming soon
Frequently Asked Questions
What is the Paratu CP?
What are the official Maxon motor specs?
How much does a complete build weigh?
Does the Paratu CP support mullet (mixed wheel size)?
What is the frame material and warranty?
What rear-shock standards does the frame take?
What drivetrain works with the eBike version?
Is the bottom bracket replaceable?
What's the kinematic signature?
Where is it manufactured?
How do I order — direct or dealer?
What press has reviewed the Paratu CP?
Frequently Asked Questions
What is a Concentric Pivot suspension?
The CP design places the main pivot concentrically with the rear axle. This completely isolates the suspension from braking forces, so the shock stays active and predictable whether you are on or off the brakes. It produces a bottomless, linear feel on rough terrain.
What is included in the frame kit?
Full carbon CP frame, Maxon Bikedrive AIR S motor (90 Nm), 400 Wh in-tube battery, HMI display, mode shifter, E13 Core crankset with 32T chainring, RA Reach Adjust headset, UDH hanger, and internal cable routing kit. Everything you need to build — just add suspension, wheels, drivetrain, and cockpit.
Can I run it as a mullet (mixed wheel)?
Yes. The Paratu CP supports 29″/29″ or 29″/27.5″ mullet via the geometry-preserving yoke flip chip. The flip chip adjusts BB height and head angle so geometry stays balanced in either configuration.
How much travel can I run?
The rear end accepts 145, 150, 160, or 165 mm of travel via a 230 mm eye-to-eye shock (standard mount). Fork compatibility is 150–170 mm. This range covers everything from aggressive trail to full enduro.
What is the Maxon Bikedrive AIR S?
A lightweight eMTB motor system developed in Switzerland. 90 Nm torque, 620 W peak power, 2 kg motor weight. Near-zero drag when off — the internal gears retract from the driveshaft so you can ride fully analog. Three customisable modes via the Maxon app.
How long does the battery last?
The 400 Wh in-tube battery provides 2–3 hours in mixed modes. Add the optional 250 Wh range extender ($769 USD / €699 EU, 1.4 kg, bottle-cage mount) for up to 650 Wh total and 4–5+ hours of ride time. See our Range Calculator for detailed comparisons.
What is the RA Reach Adjust headset?
A proprietary headset system with three positions: 0, −5, or +5 mm of reach adjustment. It lets you fine-tune fit within your frame size or bridge between sizes without changing any other geometry parameters.
What does DDP shipping mean?
Delivered Duty Paid. The price you see is the price you pay — we handle all import duties, taxes, and customs clearance. Free worldwide shipping on all frame kits. No surprise fees at your door.
What is the warranty?
5-year frame warranty, 2-year motor warranty (Maxon), crash replacement programme available. First owner only. See our Warranty Policy for full details.
What is the difference between Paratu CP and Paratu HL?
The Paratu CP uses a Concentric Pivot suspension with the Maxon Bikedrive AIR S motor (90 Nm, 400 Wh). The concentric pivot architecture delivers 97.3% anti-squat, ~100% anti-rise, and 3.0–3.5° pedal kickback — the same frame platform as the Iuhu CP pedal bike, with full motor integration. See the K-Volve Kinematics page for a full engineering breakdown.
Build Your Paratu CP
Frame kit from $6,589 USD / €5,990 EU • Custom colors from $7,139 USD / €6,490 EU • Free worldwide DDP shipping
Independent Analysis
K-Volve in Action
Engineering at a Glance
K-Volve Kinematics
Five independently validated metrics. ~100% anti-rise at sag — the rear stays neutral under braking where every competitor rises. 97.3% anti-squat — no bob without lockout. 3.0–3.5° pedal kickback — below what most riders feel. On the eMTB: effectively zero under Maxon assist.
Full K-Volve analysis →G-Volve Geometry
Head angle and seat tube angle change with travel configuration. 63.9° at 145mm, 63.5° at 160mm. The 448mm chainstay is constant across all three sizes. Every angle is calculated before it is cut.
Full geometry tables →RA Reach Adjust
−5, 0, or +5mm of reach adjustment without changing any other geometry. 15mm of total adjustment within your frame size. No stem swap. No spacer stack. Included with every CP frame.
Full RA guide →Maxon BikeDrive Air S
2 kg. 90Nm. Never throttles. The lightest mid-drive on the market and the only one that sustains full output from trailhead to summit. Internal gears retract from the driveshaft when off — near-zero drag.
Full motor specs + comparison →Technology Deep-Dives
360° View & Gallery
High-resolution imagery and 360-degree viewer coming soon. Contact sales@bikelab-inc.com for current frame images.
What the Experts Say
“170 mm of travel, 19.5 kg and a full-power motor: the Dirtlab Paratu promises to square the circle.”
— Ludwig Dohl, emtb-test.com / YouTube: @ridebetterbikes — Independent Review, Feb 2026
“Thanks to its low overall weight of 19.5 kg, the bike is easy to pop over root carpets and flick through direction changes.”
— Ludwig Dohl, emtb-test.com / @ridebetterbikes — Ride Quality Assessment, Feb 2026
“Whether it’s assisting or you’re trail-surfing on the way down, you don’t hear a thing. We like that.”
— Ludwig Dohl, emtb-test.com / @ridebetterbikes — Noise Assessment, Feb 2026
Motor specifications: Maxon BIKEDRIVE AIR S — 620W peak power, 90 Nm torque, 400% max assist ratio. Full motor details →
See It in Action
What the Experts Say
“The Dirtlab Paratu might be an underdog, but it brings qualities that some of the big players can only dream of.”
— Ludwig Dohl, emtb-test.com / YouTube: @ridebetterbikes, February 2026
“Thanks to its low overall weight of 19.5 kg, the Paratu is a trail weapon that you don’t have to fight against on the descents.”
— Ludwig Dohl, emtb-test.com / YouTube: @ridebetterbikes, February 2026
“Whether it’s assisting or you’re trail-surfing on the way down — the Maxon motor is near-silent. You hear the trail, not the motor.”
— Ludwig Dohl, emtb-test.com / YouTube: @ridebetterbikes, February 2026