Enduro E-Bike frame only Kit

• • The Dirtlab Paratu CP Frame: A revolutionary e-bike frame kit with our latest G-Volve geometry and K-Volve kinematics, S-Volve sizing & fitted with the new Maxon Bikedrive Air S engine system for more power and range:

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    • G-Volve geometry is long, not too low, and slack. A 63.5-degree Head angle paired with a 77.8 seat tube angle. 
    • K-Volve kinematics here we switched from traditional Horst link to a concentric pivot, ruling out brake chatter disturbances to optimize the bottomless feel we are known for. low position when you use 29" F&R, High when you want a mullet setup 29F 27.5R.
    • S-Volve sizing has become even better, as each frame now offers sizes within its range. We utilize a RA (Reach Adjust) headset system, allowing you to start in the 0 position, travel down your fork 10mm and use the shorter -5 position, or fork up 10mm and use the longer +5 position. The same thing works for people who are between our sizes, they can use the longer frame and start short or the smaller frame and start long.
    • Driven by the new Maxon Bikedrive AIR S drive system: 88Nm, 650W, 400Wh internal battery, and an optional 250Wh. range extender.
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  • Collaboration with Maxon: From 2020 to 2022, we worked closely with Maxon to integrate and refine the frame and engine system, ensuring a top-notch e-bike that rides like a dream. This resulted in the Maxon Bikedrive Air systems a 2x you system. Since then, the market has evolved, and more power was needed, so we embarked on the second phase of the Air S system, which resulted in increased power and range. We maintained the original smoothness and almost zero drag feeling in the engine, meaning that you can ride it analog if you switch off the modes, so the gears retract from the driveshaft. 

  • Engine Excellence:

    • Inspired by NASA’s Mars rover and copter engines
    • Compact and robust with a maximum power output of 88Nm
    • Three customizable ride modes are customizable via a Bluetooth app.
    • Combine your data acquisition with many GPS watches or bike computers
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  • Lightweight Design:

    • Engine system: Only 3.7 kg
    • Frame: Approximately 2490grs, color/size-dependent
    • Complete bike weights: Between 14.9 Kg. (TRAIL)-18.5 Kg. (full enduro coil). 
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  • Customization Options:

    • Four rear suspension travel options: 145, 150,160 mm, or 165mm (230 eye to eye length shock, using 57,5/60/62.5/65 stroke lengths )
    • Compatible with 150-180mm front forks 
    • 29F&R or 29F 27.5R flip chip for unchanged geometry when switching rear wheels.
    • Reach adjust headset to make sure with each travel option you can ride in the sweet spot of sizing by adjusting the reach from 0 to -5 and +5mm.
    • Framekit includes: Frame, Reach Adjust Headset, Engine system, E13 core Crankset and DM 32/34T Chainring.
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  • Powerful Battery System:

    • Maximum engine output: 88Nm and 650W power
    • In-tube battery: 1.8Kg, 400Wh, rechargeable in 3 hours
    • Optional 250Wh range extender for longer adventures
•  

  • Ride Dynamics:

    • Engine tuned for MTB-specific cadence at an average of 65RPM
    • Battery efficiency allows for 2-5 hour rides
    • Eco-Trail and Boost modes with a magnetic shifter for easy control
    • The closest you can get to real biking with 3x your strength available.
•  

  • Pre-Order Process: We operate on a pre-order basis to ensure quality and value, with a 3-week lead time for painting and assembly. Engine delievries start from September 2025. Pre-orders can be taken from now on here or via email.

  • Color Customization: Choose any Pantone color for a fully personalized bike, with a maximum lead time of 5 weeks for stocked frames.

  • Need More Info? If you have questions or want to chat, drop us an email at sales@bikelab-inc.com

• We hope this breakdown makes everything about the Dirtlab Paratu CP frame more clear and that it has sparked you to get one, If you have any more questions or need further assistance, feel free to ask, we do one to one video meetings as an extra service free of charge and can assist you to buy the right E-bike. 😊

   

• K-Volve Kinematics

Detailed Analysis of CP Frame Kinematics and Design

The CP's concentric pivot layout delivers 150-165mm of rear travel via a 230x57.5/60/62.5/65mm stroke, utilizing metric shocks, with a horizontal orientation for low standover and easy access. It's optimized for aggressive enduro/trail use, supporting both pedal and e-bike configs (with weights around 14.75kg pedal, 18.55kg e-bike). The kinematics emphasize a "progressive nature" for handling big impacts while maintaining pedaling efficiency—let's map this to relate to suspension engineers wishes for frame kinematics and linkage designs as found on Pinkbike.com in their article.

Kinematics for Easy Shock Tuning

Experts like Vorsprung and Fox both stress moderate leverage ratios (2.5:1-3:1), 25-30% progression (mostly early in travel), balanced anti-squat/anti-rise, and forgiving axle paths to avoid harshness or tuning compromises. The CP nails this:

• Leverage Ratio and Progression: The charts display a progressive curve, starting around 3:1 (moderate, not excessively high, as per Fox's warning about initial sensitivity leading to bounce and poor feedback). It ramps up progressively to provide "bottomless" support, aligning with Vorsprung's ideal 25-30% progression (mostly in the first 75% of travel). This makes it versatile for air or coil shocks—Öhlins would approve, as it leaves room for volume spacers without overheating on high-leverage setups. No "too much progressivity" issues (which Fox said can feel unintuitive and overload tires), and it's not too linear (avoiding the need for overly stiff springs on coils, as noted by multiple experts). Result: Easy tuning, with the guide's mid-range damping starts working well for a wide rider range (50-120kg).

• Anti-Squat and Anti-Rise: Anti-squat is "optimized for pedaling in typical climbing gears," hovering in a balanced range (charts suggest ~100-120% in key zones, not excessive like Fox cautioned against for harshness in technical climbs). For e-bikes, this is spot-on—less reliance on kinematics due to motor torque, echoing Fox's advice. Anti-rise is tuned for "chassis stability under hard braking," keeping it low enough to avoid the stiffening Vorsprung and Fox flagged as a control killer in corners. Pedal kickback is minimal, supporting Mojo Rising's preference for simple systems without funky curves.

• Axle Path and Overall Feel: The path starts rearward for square-edge absorption (great for enduro hits), then goes more vertical deeper in travel, similar to high-pivot forgiveness Vorsprung praised, lower shaft speeds, and wider tuning windows. This balances nimbleness with plushness, avoiding Öhlins' concerns about high-leverage stress on components. Rider variability? The guide's sag targets (28-30% air, 30-33% coil) and iterative tuning tips make it adaptable, much like the experts' emphasis on modern dampers' handling compromises.

In short, the CP avoids "extreme" pitfalls (e.g., no wild leverage changes per Dave Weagle), making it a tuner's dream—shocks from Fox, Öhlins, RockShox, DVO, and EXT all get detailed setups, proving broad compatibility.

Design for Shock Longevity and Reliability

The article's consensus: Ideal frames use standard eyelets, no long/asymmetric yokes, decouple from flex, and ensure alignment to minimize side-loading and wear. The CP excels:

• Mounting and Side-Loading: Standard metric eyelets (no trunnions, avoiding Vorsprung's "scissoring" risks in flexible frames) and no yokes mentioned—huge win, as all experts (especially Fox's Andrew De Tablan) hated long yokes for buckling loads and seal wear. The horizontal layout isolates the shock from vertical flex, decoupling it like Vorsprung recommended for "two-force member" behavior. Concentric pivot ensures alignment, reducing torque on eyelets (Fox's point about rotation near bottom-out).

• Durability Factors: Larger-volume shocks prevent overheating (Öhlins' concern), and the guide emphasizes service (key for longevity per everyone). Coil preference for consistency matches Fox's note that air shocks handle bending better but coils need structural support—the CP supports both without risks. Frame flex is managed without "flexy weird" issues (Dave Weagle), and e-bike integration doesn't cram the shock, providing clearance for tolerances (Vorsprung's tip). Mojo Rising would love the spherical-bearing potential implied in the pivot design.

Potential nitpicks: If alignment tolerances slip in manufacturing, it could introduce bending (Dave Weagle's trunnion caveat), but the guide's pro tuning advice mitigates this. Overall, it's shock-friendly, prioritizing reliability without sacrificing enduro prowess—experts would call it a balanced compromise.

This analysis shows the CP as a real-world exemplar of the article's ideals: tunable without headaches, durable for the long haul.

"The CP Frame – Where Shock Legends Meet Lightning Speed"

Imagine a stormy trail in the Taiwanese mountains, where lightning cracks the sky and riders chase the thrill of untamed descents. That's the spirit of the Paratu CP—named for "lightning" in the indigenous Bunun language—a frame born from the shadows of innovation at Dirtlab, now striking with the precision of Swiss-engineered power and kinematics that even the shock world's heavy hitters would applaud.

Picture this: You're an engineer at Dirtlab, huddled over blueprints, whispering, "What if we built a frame that dances perfectly with any shock, no compromises?" Drawing inspiration from the candid wisdom of industry titans, you craft the CP's concentric pivot magic. Fox's Johan Jarl once mused that kinematics are a game of balances—avoid high initial leverage for that smooth, feedback-rich ride. The CP listens: Its progressive leverage curve starts moderate at ~3:1, ramping just right to deliver plush sensitivity without the bounce or harshness Jarl warns against. No excessive progressivity here; it's that 25-30% sweet spot Vorsprung's Steve Mathews champions, letting you fine-tune with volume spacers for air or coil, whether you're blasting enduro stages or pedaling e-assisted climbs.

But it's not just about the ride—it's about endurance. Andrew De Tablan at Fox cringes at long yokes and asymmetric designs that buckle shocks like fragile spaghetti. The CP sidesteps that trap entirely: Standard eyelets, a strong, stable, and precisely engineered yoke, and a horizontal layout that decouples the shock from frame flex, treating it as the pure "two-force member" Mathews dreams of. Öhlins echoes the call for service and side-load resistance; our larger-volume metric shocks (230x60/65mm) fend off overheating, while the concentric design banishes brake chatter, ensuring longevity even on mud-slinging epics. Mojo Rising's Chris Porter would grin at the simplicity—no patented gimmicks, just proven K-Volve kinematics with balanced anti-squat for efficient power transfer, minus the harshness from overkill values that Fox cautions against.

And Dave Weagle? He'd tip his hat to the CP's real-world savvy: Trunnions get a bad rap for poor alignment, but we skip them for flawless compatibility, letting you swap Fox DHX2 coils or Öhlins TTX Air with ease. High-pivot forgiveness shines in our rearward-then-vertical axle path, absorbing square-edge bombs without the tuning headaches Mathews describes. For e-bikers, it's a revelation—less anti-squat needed, as Jarl notes, paired with Maxon's silent 90Nm torque for lightning-fast ascents under 19kg.

Riders who've tamed the CP rave about its "planted, bottomless feel," conquering trails from Taichung's steeps to global enduro circuits. It's not just a frame; it's a symphony where shock legends' insights harmonized with Dirtlab's bold vision. Fast as lightning, reliable as the experts demand—grab your Paratu CP and electrify your ride. Ready to strike? Check our options and feel the power.

G-Volve Geometry

Some complete build examples of the Paratu CP, contact us for complete builds via sales@bikelab-inc.com please, then we can guide you through the offerings we have and build your dreambike:

• Maxon Modeshifter by Zirbel 

  

  Maxon HMI display w. integrated processor 

  

  Maxon Bikedrive air Sengine 1.95KG 88NM 666W.

  

  Maxon 400Wh intube Battery 1.8k

   

• 

• • The Dirtlab Paratu HL Frame: A revolutionary e-bike frame kit that includes:

    • Maxon Bikedrive AIR drive system
    • E13 crankset with a 32T chainring
    • 104BCD 4 arm spider

  • Collaboration with Maxon: From 2020 to 2022, we’ve worked hand-in-hand with Maxon to integrate and fine-tune the frame and engine system, ensuring a top-notch e-bike that rides like a dream.

  • Engine Excellence:

    • Inspired by NASA’s Mars rover and copter engines
    • Compact and robust with a maximum power output of 30Nm
    • Three customizable ride modes which are customizable via a Bluetooth app

  • Lightweight Design:

    • Engine system: Only 3.5Kg
    • Frame: Approximately 2400grs, color-dependent
    • Complete bike weight: Between 14.5 (DC TRAIL)-18Kg (full enduro coil), based on components and use category.

  • Customization Options:

    • Two rear suspension travel options: 150mm or 130mm (205 trunnion shock)
    • Compatible with 150-170mm front forks (145R) or 140-150mm forks (130R)
    • Framekit includes: Frame, Headset, Engine system, Crankset, Spider, and Chainring
    • Additional DVO forks and rear shocks available for ordering

  • E-Menace/Paratu vs. Menace:/Iuhu The E-Menace maintains the beloved ride feel of the Menace platform, with slight modifications for e-bike suitability.

  • Powerful Battery System:

    • Maximum engine output: 40Nm and 280w power
    • In-tube battery: 1.2Kg, 250Wh, rechargeable in 3 hours
    • Optional 250Wh range extender for longer adventures

  • Ride Dynamics:

    • Engine tuned for MTB-specific cadence at an average of 65RPM
    • Battery efficiency allows for 2-5 hour rides
    • Eco-Trail and Boost modes with a magnetic shifter for easy control
    • the closest you remain to real biking with 2 x your strength available.

  • Pre-Order Process: We operate on a pre-order basis to ensure quality and value, with a 3-week lead time for painting and assembly.

  • Color Customization: Choose any Pantone color for a fully personalized bike, with a maximum lead time of 5 weeks for stocked frames.

  • Need More Info? If you have questions or want to chat, just drop us an email at sales@bikelab-inc.com

• We hope this breakdown makes everything about the Dirtlab E-Menace frame clearer and has sparked you to get one, If you have any more questions or need further assistance, feel free to ask, we do one to one video meetings as an extra service free of charge and can assist you to buy the right E-bike. 😊

•  

  GEOMETRY 

• 
• 
  

•  

  
  

  Maxon Modeshifter by Zirbel 

  

  Maxon HMI display w. integrated processor 

  

  Maxon Bikedrive air engine 1.85KG 40NM 280W.

  

  Maxon 250WH intube Battery 1.2kgs

  
  

• • The Dirtlab Paratu Frame: A revolutionary e-bike frame kit that includes:

    • Maxon Bikedrive AIR drive system
    • E13 crankset with a 32T chainring
    • 104BCD 4 arm spider

  • Collaboration with Maxon: From 2020 to 2022, we’ve worked hand-in-hand with Maxon to integrate and fine-tune the frame and engine system, ensuring a top-notch e-bike that rides like a dream.

  • Engine Excellence:

    • Inspired by NASA’s Mars rover and copter engines
    • Compact and robust with a maximum power output of 30Nm
    • Three customizable ride modes which are customizable via a Bluetooth app

  • Lightweight Design:

    • Engine system: Only 3.5Kg
    • Frame: Approximately 2400grs, color-dependent
    • Complete bike weight: Between 14.5 (DC TRAIL)-18Kg (full enduro coil), based on components and use category.

  • Customization Options:

    • Two rear suspension travel options: 150mm or 130mm (205 trunnion shock)
    • Compatible with 150-170mm front forks (145R) or 140-150mm forks (130R)
    • Framekit includes: Frame, Headset, Engine system, Crankset, Spider, and Chainring
    • Additional DVO forks and rear shocks available for ordering

  • E-Menace/Paratu vs. Menace:/Iuhu The E-Menace maintains the beloved ride feel of the Menace platform, with slight modifications for e-bike suitability.

  • Powerful Battery System:

    • Maximum engine output: 40Nm and 280w power
    • In-tube battery: 1.2Kg, 250Wh, rechargeable in 3 hours
    • Optional 250Wh range extender for longer adventures

  • Ride Dynamics:

    • Engine tuned for MTB-specific cadence at an average of 65RPM
    • Battery efficiency allows for 2-5 hour rides
    • Eco-Trail and Boost modes with a magnetic shifter for easy control
    • the closest you remain to real biking with 2 x your strength available.

  • Pre-Order Process: We operate on a pre-order basis to ensure quality and value, with a 3-week lead time for painting and assembly.

  • Color Customization: Choose any Pantone color for a fully personalized bike, with a maximum lead time of 5 weeks for stocked frames.

  • Need More Info? If you have questions or want to chat, just drop us an email at sales@bikelab-inc.com

• We hope this breakdown makes everything about the Dirtlab E-Menace frame clearer and has sparked you to get one, If you have any more questions or need further assistance, feel free to ask, we do one to one video meetings as an extra service free of charge and can assist you to buy the right E-bike. 😊

•  

  GEOMETRY 

• 
  

•  

  
  

  Maxon Modeshifter by Zirbel 

  

  Maxon HMI display w. integrated processor 

  

  Maxon Bikedrive air engine 1.85KG 40NM 280W.

  

  Maxon 250WH intube Battery 1.2kgs