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Brompton Direct-Drive Motor CA3 Kit

Front Brompton Folding Bike Kit with 250-500 Watt Direct Drive Hub Motor and Options for PAS and Torque sensors.

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From USD$721.00

To USD$2,173.50

In stock

SKU
KIT-BromptonRTR
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Customize Brompton Direct-Drive Motor CA3 Kit

The small SAW20 brompton motors come in a fairly fast 12 rpm/V winding speed and are prelaced in a 16" ETRTO349 rim.
The M10x1mm axle has 8mm flats on it and comes with a custom made tabbed washer to engage with holes in the brompton fork and provide axle spinout resistance.

Crystalyte SAW20 Fast Wind for Bromptons

Crystalyte 20mm SAW Motor, Fast 13RPM/V Wind in 16'' ISO349 rim. Narrow 75mm Axle with 8mm Axle Flats for Brompton Fork.

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Crystalyte 20mm SAW Motor, Fast 13RPM/V Wind in 16'' ISO349 rim. Narrow 75mm Axle with 8mm Axle Flats for Brompton Fork.

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8mm Torque Arm Plates for Brompton Motors

Pair of stainless steel torque arm plates for narrow SAW / NSM motors with small 10mm axles with 8mm axle flats, with bent tab specifically to fit forks of Brompton folding bicycles. Full Product Information Page

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Pair of stainless steel torque arm plates for narrow SAW / NSM motors with small 10mm axles with 8mm axle flats, with bent tab specifically to fit forks of Brompton folding bicycles. Full Product Information Page

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The Baserunner Z9 Stand Alone controller supports up to 55A peak phase currents and should be screwed to the aluminum mounting bracket for heat sinking. The battery lead is terminated with anderson powerpole connectors. 

V6 Baserunner_Z9 Stand Alone

Grin Baserunner V6 Compact FOC Motor Controller with Z910 Motor Plug, 55A Peak Phase Current. Special Stand-Alone Model with All Cables Exiting the Front. Includes 90cm Long Battery Lead. For 24-52V Batteries (60V Max Input). 

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Grin Baserunner V6 Compact FOC Motor Controller with Z910 Motor Plug, 55A Peak Phase Current. Special Stand-Alone Model with All Cables Exiting the Front. Includes 90cm Long Battery Lead. For 24-52V Batteries (60V Max Input). 

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Baserunner Brompton Fork Mount

Aluminum Mounting Bracket for Baserunner Attachment to Brompton Bicycle Forks Fender Bolt. 

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Aluminum Mounting Bracket for Baserunner Attachment to Brompton Bicycle Forks Fender Bolt. 

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The V3 Cycle Analyst is an integral part of this kit system that ties together the throttle, ebrake, PAS, and torque sensor signals into a highly configurable platform that can be readily customized for a range of performance behaviors you can't get anywhere else. As a display it may look a tad clunky, but the functionality it offers is simply unparalleled and continues to increase with each new firmware release.

CA3 for use with Brompton Kits

V3 Cycle Analyst WP with Bracket for Brompton Stem and Shortened 85cm Lead Wire. NOTE, on new 2018 Brompton Bikes, mounting hole in bracket must be enlarged to 5/16" or 8mm. Full Product Information Page

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V3 Cycle Analyst WP with Bracket for Brompton Stem and Shortened 85cm Lead Wire. NOTE, on new 2018 Brompton Bikes, mounting hole in bracket must be enlarged to 5/16" or 8mm. Full Product Information Page

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CA3_MFSwitch for CA3-WPx

Multifunction Switch for CA3-WP, with On/Off Power, Up/Down Digital Aux Buttons, and Screen Toggle. 45 cm cable length.

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Multifunction Switch for CA3-WP, with On/Off Power, Up/Down Digital Aux Buttons, and Screen Toggle. 45 cm cable length.

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The kit will run with any battery pack from 24V to 52V nominal (and up to 72V with a Phaserunner).
We offer a range of batteries that will work well depending on the geometry of your bike, the range you need on a charge, and how fast you want to go.  Please see our battery info page for more details on the different pack options.  
Be sure to select a charger model that matches the voltage (36V, 48V, or 52V) and connector style (ST3 or XLR) of the chosen pack.  

The small SAW20 motors come in a fairly fast 12 rpm/V winding speed to compensate for the smaller wheel diameters in which they are typically laced. These hubs fit forks with 75mm dropouts but with a standard 10mm dropout slot. 

The M12x1.25 axle is compatible with our standard front torque arms. 

There are a number of optional electronic and mechanical accessories that can help flush out the build. This includes front and rear bike lights, phone chargers, wire management, programming cables, and what have you. 

Handlebar Phone Mount with both Wireless and USB Charging, Wide 12-95V Input Range.  

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Bike tracker that works with Apple Find My  

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Wide Voltage Range (6-60V), 3 watt Ebikes Light, Fork Fender mounting. 50cm cable, 5.5x2.1mm DC Jack. On/off Switch, Powers off Cycle Analyst/Anderson Tap. StVZO Compliant.

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Grin 12 LED Front E-Light, 72V Ready

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Super Bright (Max 1900 Lumen) Ebike Light with Handlebar Button and Hi/Low Beam Modes and Daytime Run Lights as Well. 12-60V Input Range with Reflective Cutoff Optics. Plugs Directly to Cycle Analyst.

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Main9 to DC 5.5mm x 2.1mm Male Adapter, 1m long. Provides Convenient Power Source for Rear Bike Lights from Unused Main9 Plug in Controllers with V3 Cycle Analyst  

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180cm DC Accessory Extension Cable

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Rear Ebike Light, No On/Off Push Button, 6-60V Input Range with DC 5.5x2.1mm DC Jack. 

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Parallel Anderson Cable for Baserunners Installed in Reention Case. Simplifies Dual Controllers or Dual Battery Systems.  Must be purchased with Baserunner and Reention battery

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4 Pieces of Snap Together Black Plastic Cable Raceway, 15 and 20mm Wide, 50cm long. Self Adhesive Tap Bonds to Bicycle Tube, Perfect for Hiding Cable Runs. 

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Cable Bundling Kit, includes Spiral Wrap, Zip Ties, and Velcro Sleeves

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Laser Engrave 250 Watt Continuous Power Rating on Motor Side Plate.  This is Truthfull. ALL Hub Motors Offered by Grin Have an Operating Point (RPM and Allowable Temperature) Where They Can Only Sustain 250W. 

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3m Long TTL-> USB programming cable for Satiator, Baserunner, Phaserunner and Cycle Analyst. *Note: All kits come pre-programmed, and most system behaviour is configurable with the Cycle Analyst buttons. But this cable is necessary if you plan to change more advanced controller settings or update device firmware* Full Product Info

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Schwalbe Big Apple 26" x 2.15 Puncture Resistant Tire. 

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Your Customization
SAW20 Direct Drive Motor in 16" ETRTO 349 Rim
Brompton Direct-Drive Motor CA3 Kit

In stock

USD$721.00

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Actual cruising speed/perfomance under any loading conditions is well modeled in our simulator.
Launch Motor Simulator with Brompton Direct-Drive Motor CA3 Kit

Summary
  • Front Direct Drive Wheel:
    1 x Crystalyte SAW20 Fast Wind for Bromptons
  • Brompt Torque Arms:
    1 x 8mm Torque Arm Plates for Brompton Motors
  • Z9 SA Controller:
    1 x V6 Baserunner_Z9 Stand Alone
  • Controller Mounting Bracket:
    1 x Baserunner Brompton Fork Mount
  • V3 Cycle Analyst:
    1 x CA3 for use with Brompton Kits
  • Auxiliary Input and Power Switch:
    1 x CA3_MFSwitch for CA3-WPx

Front wheel conversion kit for Brompton folding bicycles based around a 250-500 watt Direct-Drive Crystalyte motor laced in a 16" ETRTO 349 rim. Motor axle is 75mm long with a 3/8" axle ground to 8mm on the flats, and fits in the Brompton fork with no modifications. A pair of torque arms mate with the dropout's anti-rotation hole to prevent spinout.

The compact Baserunner mounts on a custom bracket behind the fork and does not interfere with the folding. The V3 Cycle Analyst supports either a magnet ring PAS sensor or a Torque Sensing bottom bracket for automatic assist modes. For details on the PAS/Torque sensor selection, see the Advanced PAS Kit Info Page

See our Brompton Kit Info Page for full description and details.