Interactive Technical Briefing
Koine

RAINIER

An adaptive all-electric trail trike. Designed for diversity, built for freedom.

Forest-ready durability
Inclusive rider fit
Power to explore

Click around — several sections expand for more detail.

Prototype Render
Prototype render of the adaptive electric trail trike
Scroll for operational details
Weight
64 lbs
The lightest powered adaptive mountain bike on the market. Independently load and unload.
Range
40–80 mi
52V 20Ah lithium-ion battery supports full-day rides on a single charge.
Initial Retail Price
$8k
3-yr target $5k
Manufacturing scale and continued development are expected to bring the retail price to $5,000 within three years.
$8k today$5k in 3 yrs
In the Field

Prototype Gallery

Low front three-quarter outdoor photo of the physical KOINE prototype
Rider beside the physical KOINE prototype at a public meetup
Rear three-quarter view of the physical KOINE prototype
Rider using the physical KOINE prototype on a forest path
Side profile rider photo of the physical KOINE prototype in a forest setting
Product

Design Overview

Core product priorities and component intent. Click a card to expand, hover the diagram to inspect.

Rider Adaptability

  • Three rider positions from upright to long-sitting.
  • Seat, support, and restraint points adjust for individual fit.
  • Focus on inclusive rider onboarding.

Fleet Operation

  • Single-volunteer setup objective.
  • Compatible with existing transport solutions.
  • Fast transition between riders.

Maintenance Simplicity

  • Standard bike shop service strategy.
  • Low custom part count.
  • Two core fastener sizes reduce tool management.

Cost Accessibility

  • Target purchase range supports fleet adoption planning.
  • Low seasonal consumables target.
  • Early pilot feedback intended to stabilize long-term service cost.

Trail Performance

  • Tadpole stance for predictable stability.
  • Rigid frame prioritizes reliability.
  • Hub motor supports climbing and assist needs.
Hover labels to inspect component intent
Profile photo of the adaptive trail trike with component callouts
Front Wheel Pair Provides steering stability and a predictable front contact patch on varied trail surfaces.
Fat Rear Tire Adds passive shock absorption and rear traction where the frame stays rigid for durability.
Rear Hub Motor Delivers electric propulsion from the rear wheel to support climbing and longer assisted outings.
Rigid Frame Keeps the architecture simpler to maintain, easier to service, and more durable for fleet use.
ComponentFunction
Front Wheel PairProvides steering stability and a predictable front contact patch on varied trail surfaces.
Fat Rear TireAdds passive shock absorption and rear traction where the frame stays rigid for durability.
Rear Hub MotorDelivers electric propulsion from the rear wheel to support climbing and longer assisted outings.
Rigid FrameKeeps the architecture simpler to maintain, easier to service, and more durable for fleet use.
Rider Fit

Rider Adaptability

Select a position to explore the configuration. All fit points adjust to support a wide range of riders and disabilities.

Active rider position

90-degree seated with foot pegs

    Static Adjustment Points

    • Backrest height (removable)
    • Seat dump
    • Seat width
    • Strap placement
    • Seat fore/aft
    • Seat height

    Rider Limits

    Max height: 6'2" Max weight: 220 lbs Volunteer adjustment: 20–30 min
    Position 1
    Position 1

    90-degree seated with foot pegs

    • Upright seated posture for stable trunk support.
    • Foot pegs position lower legs in controlled neutral placement.
    • Uses stock bike pedals for personal user fit preference (straps, studs, etc).
    Position 2
    Position 2

    45-degree forward position with foot pads

    • Useful for shorter legs or for riders who prefer their knees closer to their chest for stabilization.
    • Foot pads support broader lower-limb contact area.
    Position 3
    Position 3

    Long-sitting configuration with adjustable leg supports

    • Great for riders already used to standard adaptive off-road seating interfaces.
    • Leg supports provide extended lower-limb guidance.
    • Wide adjustability accommodates anthropometric diversity.
    Operations

    Program Operations & Maintenance

    Operational targets are designed around real volunteer workflows. Click a stat for more detail.

    64 lbs
    Bike Weight
    Light enough to independently load and unload from common racks and trailers.
    < 5 min
    Unload Time
    Designed for quick unloading from common racks and trailers with minimal handling complexity.
    < 10 min
    Setup Time
    Typical setup after rider is selected and baseline seat settings are known.
    Existing
    Transport
    Compatible with existing transport solutions. No dedicated trailer architecture planned for baseline operations.
    1
    Volunteer
    Routine movement and setup tasks are intended to be handled by one trained volunteer.
    Maintenance & Durability
    Frame Materials
    • 4130 chromoly steel
    • Aluminum components
    Component Strategy
    • Standard bicycle components wherever possible
    • Minimal custom components
    • All serviceable via normal bike shops
    Fastener Standardization

    Only two fastener sizes: M5 and M8. Shared lengths allow easy interchange.

    Routine Maintenance
    • Pre-ride inspection
    • Seasonal service
    • Estimated seasonal consumables: < $50
    Technical Reference

    Specifications

    ConfigurationTadpole trike
    MotorBafang geared motor or Grin MAX45 Fat Hub Motor
    Battery52V 50-AMP 20 Ah battery
    BrakesTektro Auriga Twin hydraulic disk brakes
    Max torque95 Nm
    Top speed20 mph
    Range40–80 miles
    Max grade20%
    Types of trailsFire roads, double track, some hiking trails, gravel trails, paved bike paths
    WheelsFront: 26 x 2.4; Rear: 26 x 4.5 fat tire
    Tube configurationTubeless
    Frame architectureRigid frame
    DimensionKoine RAINIEROther AMTBsNot A Wheelchair — The Rig 2.0
    Best FitPrograms prioritizing accessible trail riding, easy transfers, simple setup, durability, and a realistic price pointPrograms seeking premium off-road capability, higher-end components, and specialized performance featuresIndividual riders prioritizing raw off-road capability; falls into the mini-ATV category — heavy, bulky, and harder to transport and stage than a trail trike
    Transfer EaseSingle rear wheel allows the rider to transfer closer to the seat, reducing reach and simplifying volunteer-assisted onboarding.Often optimized more around performance or a specific rider profile than easy assisted transfer.Transfer is accessible but the wide dual-rear wheelbase requires the rider to transfer from further away, increasing difficulty for some users and volunteers.
    Adaptive SupportBuilt for higher-support use cases with fit-adjustable restraint and seating points.Can be excellent for specific riders, but usually at higher complexity and cost.18" fixed seat width with 250 lb weight capacity; less focus on adjustable adaptive seating or restraint points.
    Price Position$8k initial retail; 3-year target $5kTypically $13k+ and often higher with premium controls, suspension, and customization$5,999 launch price (pre-order); Big Rig at $11,999
    Trail PositioningAdaptive trail trike built to balance rider support with practical serviceability.Focused on top-end adaptive MTB performance and premium ride systems.Strong off-road performance — 18 mph top speed, 5" suspension travel, 8.5" ground clearance. Built for rugged terrain but sized and weighted more like a mini-ATV than a trail trike.
    Durability / SimplicityFixed frame and minimal component count with standardized fasteners enable long service lifespans and easy maintenance and repair.Can be durable, but premium systems and customization usually raise maintenance and service burden.3,000W motor and full suspension add real capability but increase maintenance complexity and contribute to the 160 lb curb weight.
    Program ValueDesigned to help programs serve more riders with easier transfers, simpler volunteer workflows, and lower ongoing operating complexity.Often better suited for premium individual use cases than repeatable multi-rider program operations.Better suited for individual ownership or high-capability single-rider use than multi-rider adaptive program fleet operations.
    Development Status

    Where We Are & How to Become a Founding Partner

    Prototype Generation: Gen-1 First full prototype completed and in active testing.
    Field Testing Complete Whistler (BC), Bentonville/Ozarks (AR), Tiger Mountain (WA)
    Current Validation Focus Testing across broader disability populations.
    Production Timeline: ~1 Year Early demo units produced domestically.

    Founding Partner Program

    RAINIER is designed for adaptive sports programs, outdoor camps and organizations, and rental operators who want to expand access to trail riding. We're selecting 3–5 founding partners to receive early units and shape how the platform develops.

    Founding partners receive:
    • Priority allocation in the first production run
    • Fleet discount on orders of 2 or more units
    • Direct input into design refinement based on your operation's rider population and needs
    • A dedicated point of contact through delivery and early deployment
    What signing an LOI means

    Our Letter of Intent is non-binding. It expresses mutual interest in moving forward and opens a direct conversation about delivery timing, quantity, and program fit. Either party can withdraw at any time before a final agreement is signed — no penalties, no obligations. If RAINIER fits your operation, this is the lowest-friction way to stay at the front of the line.

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    Get in Touch

    Contact

    Organization

    Koine Adaptive

    Email

    info@koineadaptive.com

    Website

    [WIP]