JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser.

Home
Shop
Kits by Type
Brompton Direct-Drive Motor CA3 Kit

Skip to the beginning of the images gallery

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.

Full Product Information Page

From USD$721.00

To USD$1,959.50 Regular Price USD$2,053.50

In stock

SKU

KIT-BromptonRTR

Additional Information

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.

Specifications

Crystalyte SAW20 Fast Wind for Bromptons

Actual Weight (kg)

3.85

Manufacturer

Crystalyte

Motor MFG

Crystalyte

Motor Nominal Wheel Size

16" (ISO 349)

Motor Power Range (Watts)

250-500

Motor KV (RPM / V)

13.6

Phase Resistance (Ohm)

0.24

Disk Brake Compatible

Connector(s)

Z910

Thermistor Style

10K NTC, B~3900

Axle Length (O.L.D.)

Axle Threads

M10 x 1.0mm

Rim Brake Compatible

Yes

Rim Width (mm)

Spoke Holes

36 Hole

Motor Type

Direct Drive

Flange Spoke Diameter (mm)

172

Magnetic Pole Pairs (Phaserunner)

Hysteresis Losses (N-m)

0.37

Eddie Losses (N-m / rad/sec)

0.006

V6 Baserunner_Z9 Stand Alone

Manufacturer

Grin

Dimensions (L x W x H, mm)

98 x 60 x 15

Actual Weight (kg)

0.28

Max Regen Voltage (V)

Max Battery Amps (A)

Max Phase Amps (A)

Battery Range (V)

20-60

Connector(s)

Anderson, HiGo 0812(WP8), TRRS, Z910, HiGo MiniB

CA3 for use with Brompton Kits

Manufacturer

Grin

Actual Weight (kg)

0.29

36V 10Ah Bottle Battery

Actual Weight (kg)

2.2

Dimensions (L x W x H, mm)

295x78x78

Battery Mount Location

Frame Mount

Nominal Voltage

36 Volt (10s)

Full Charge Voltage

42.0

Capacity (Amp-Hours)

9.8

Watt-hours at 1C Discharge

345

Cell Type

Panasonic GA 10S x 4P

Internal Resistance (Ohms)

0.19

Connector(s)

Anderson, ST3

36V 2A ST3 Charger

Actual Weight (kg)

0.36

Connector(s)

ST3

Charge Port Connector

ST3

Charger Voltage

36V (42.0V max)

36V 4A ST3 Charger

Actual Weight (kg)

0.58

Connector(s)

ST3

Satiator Upgrade with ST3 Adapter

Actual Weight (kg)

1.06

24 Pole PAS (Short 90cm Cable)

Actual Weight (kg)

.06

Connector(s)

JST-SM

PAS Poles

PAS Encoder Type

2 Wire (Quadrature)

Fischer AG Torque Sensing BB, 127mm

Actual Weight (kg)

0.3300

Connector(s)

JST-SM, HiGo MiniB

PAS Poles

PAS Encoder Type

2 Wire (Quadrature)

Torque Sensor Offset Voltage

0.6

ERider68-T17 BB with 5 Arm Spider

Actual Weight (kg)

1.06

Connector(s)

Higo Signal C, JST-SM

PAS Poles

PAS Encoder Type

2 Wire (Quadrature)

Torque Sensor Offset Voltage

1.5V

Handlebar Phone Mount and Charger

Actual Weight (kg)

0.165

Minimum Input Voltage (V)

Max Input Voltage (V)

Connector / Jack

5.5 x 2.1mm DC Jack

Output Voltage

Output Current (A)

C7 Plus, 3W 80 Lux Ebike Light

Actual Weight (kg)

.088

Light Source

OSRAM

Minimum Input Voltage (V)

Max Input Voltage (V)

Peak Input Power (Watts)

Connector / Jack

DC5.5x2.1

Grin ELight 12F (72V ready)

Actual Weight (kg)

0.079

Light Source

12xCree 5mm LEDs

Minimum Input Voltage (V)

Max Input Voltage (V)

100

Peak Input Power (Watts)

1.4

Connector / Jack

DC 5.5x2.1mm

SPL-01 1900 Lumen Ebike Light

Actual Weight (kg)

0.12

Light Source

Multiple LEDs

Lumens Output

1900

Turn-On Voltage (reduced power)

Minimum Input Voltage (V)

Max Input Voltage (V)

Peak Input Power (Watts)

Connector / Jack

DC 5.5x2.1mm

Roxim Rear R1 ELight

Actual Weight (kg)

0.0690

Light Source

Red Cree XBD

Lumens Output

Minimum Input Voltage (V)

Max Input Voltage (V)

Peak Input Power (Watts)

5.5

Connector / Jack

DC 5.5x2.1mm

Schwalbe Big Apple 26" Tire

Actual Weight (kg)

1.17

Tire Width

2.15

Nominal Rim Size

26" (ISO 559)

Product Attachments

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

Click Here for detailed product info page

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

Click Here for detailed product info page

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.

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).

Click Here for detailed product info page

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

Click Here for detailed product info page

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.

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

Click Here for detailed product info page

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

Click Here for detailed product info page

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.

36V 10 Ah Bottle Battery and Cage Mount. Panasonic GA Cells, 25A BMS. ST3 Charge Port.Individually Discharge Tested at Grin to Ensure Capacity.

- Out of Stock -

36V 2.0A Lithium Battery Charger 3 pin ST connector for 100-240VAC

Click Here for detailed product info page

36V 4.0A Lithium Battery Charger 3 pin ST connector from ST 100-240V/C8

Click Here for detailed product info page

Upgrade to a Fast 8A Programmable Charger with the Satiator - Includes XLR-ST3 Adapter

Click Here for detailed product info page

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.

New Universal Lever Thumb Throttle with Clamp On Handlebar Mount

Click Here for detailed product info page

New Extra Slim Split Grin Twist Throttle, 36mm OD Fits Under Lever Shifters. 50cm cable length for CA3. Requires ID of Handlebar Tube 17mm or Larger. Won't Fit with Aluminum Handlebars with Thick Sidewalls.

Click Here for detailed product info page

New Extra Slim Split Grin Twist Throttle, 36mm OD Fits Under Lever Shifters. 140 cm cable length for controller. Requires ID of Handlebar Tube 17mm or Larger. Won't Fit with Aluminum Handlebars with Thick Sidewalls.

Click Here for detailed product info page

New Extra Slim Split Grin Twist Throttle, 36mm OD Fits Under Lever Shifters. 50cm Cable Length for CA3. Requires ID of Handlebar Tube 17mm or Larger. Won't Fit with Aluminum Handlebars with Thick Sidewalls.

Click Here for detailed product info page

Extra Slim Split Grin Twist Throttle, 36mm OD Fits Under Lever Shifters. 140cm Cable Length for controller. Requires ID of Handlebar Tube 17mm or Larger. Won't Fit with Aluminum Handlebars with Thick Sidewalls.

Click Here for detailed product info page

Full Twist Throttle, 50cm Cable with 3-pin JST Connector

Click Here for detailed product info page

Full Twist Throttle, 140cm Cable with 3-pin JST Connector

Click Here for detailed product info page

Full Twist Left Side Throttle, 50cm Cable with 3-pin JST Connector

Click Here for detailed product info page

Full Twist Left Side Throttle, 140cm Cable with 3-pin JST Connector

Click Here for detailed product info page

Dual Left and Right Ebrake levers with Single JST Connector

Click Here for detailed product info page

Pull Tripwire, Universal Ebrake Sensor for Mechanical and Some Hydraulic Levers. Full Product Information Page

Click Here for detailed product info page

Push Tripwire, Universal Ebrake Sensor for Most Hydraulic Levers. Full Product Information Page

Click Here for detailed product info page

Magura MT5e Brake and lever. Pre-Bled. 2200mm. Flip Flop lever. Cut to length. Rotor not included.

CA3 Compatible Mini PAS Sensor with 24 Poles for Immediate Engagement. For Square Taper Spindles with at Least 5mm of Exposed Spindle. Standard 90cm Cable Length

Click Here for detailed product info page

Excellent Deal Bottom Bracket Torque Sensor from Fischer-AG. Senses Left Crank Pedal Force Similar to THUN/NCTE and Requires Drilling Hole in Bottom Bracket for Cable Exit. 127mm Square Taper Spindle and 68mm BB Width.

Click Here for detailed product info page

ERider-T17N Torque Sensor for 68mm BB Shells with 170mm Miranda Cranks and 5 Bolt 130mm BCD Chainring Spider. Side Cable Exit. Chainrings Not Included.

Click Here for detailed product info page

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.

Click Here for detailed product info page

Bike tracker that works with Apple Find My

Click Here for detailed product info page

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.

Click Here for detailed product info page

Grin 12 LED Front E-Light, 72V Ready

Click Here for detailed product info page

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.

Click Here for detailed product info page

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

Click Here for detailed product info page

180cm DC Accessory Extension Cable

Click Here for detailed product info page

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

Click Here for detailed product info page

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

Click Here for detailed product info page

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.

Click Here for detailed product info page

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

Click Here for detailed product info page

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.

Click Here for detailed product info page

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

Click Here for detailed product info page

Schwalbe Big Apple 26" x 2.15 Puncture Resistant Tire.

Click Here for detailed product info page