CooSpo Tech BK8 bike speed/cadence sensor User Manual
Shenzhen CooSpo Tech Co., Ltd bike speed/cadence sensor Users Manual
Contents
- 1. Users Manual
 - 2. usermanual
 
Users Manual

Bike Speed&Cadence  
sensor
This Bike Speed&Cadence Sensor consists of a separate Cadence Sensor wired to a 
Speed+Distance Sensor that has a battery hatch and a buletooth4.0 transmitter. The sensor includes 
two magnets to activate the sensors and cable ties for installation.
INSTRUCTIONS
This Bike Speed&Cadence Sensor is mounted to the non-drive chainstay – the side of the 
bicycle opposite from the chain.
1. Using two Cable Ties, loosely hang the Cadence Sensor (A) from the underside of  
the chainstay.
2. With the bare side of the Cadence Magnet (D) placed against the backside of the crank 
arm, loosely attach the Cadence Magnet to the crank arm using a Cable Tie (F).  
-See picture.
3. Align the magnet so the molded ridge between 
"CADENCE MAGNET" passes by the symbol "RPM" 
printed. Make sure the Cadence Magnet passed 
within 3/8" (10 mm) of the Cadence Sensor.
NOTE: Magnet placement on the crank arm may 
depend upon the Cadence Sensor placement,  
the bicycle type and/or the drive chain type.
4. Tighten the Cable Tie for the Cadence Magnet, remove 
the adhesive covers on the Cadence Sensor, and tighten 
its Cable Ties.
NOTE: Bicycles with triple chainring cranksets and/
or S-bend chainstays may require either the Cadence 
Magnet or the Cadence Sensor to be shimmed in order  
to get both pieces within correct proximity.
CAUTION: Be careful not to damage the covered wire between the connected sensors.
5. Place the rubber pad (C) on the bottom of the Speed+Distance Sensor (B), and loosely attach it 
Make sure the battery hatch faces away from the  
wheel for easy access.
6. Remove the screw from the Spoke Magnet (E), place 
the part onto a rear wheel spoke so the bare magnet 
side passes within 3/8” (10 mm)  of the center of the 
Speed+Distance Sensor.
7. Install the screw, align the Spoke Magnet, and 
tighten the screw on the spoke. Make sure that it is 
still aligned with the Speed+Distance Sensor.
NOTE: Location of the Speed+Distance Sensor on the 
chainstay may depend on Spoke Magnet placement, 
the bicycle type, and/or the drive chain type, or the 
position of the attached Cadence Sensor.
NOTE: Bicycles with triple chainring cranksets and/
or S-bend chainstays may require the canting of the 
Speed+Distance Sensor toward the Spoke Magnet in 
order to get both pieces within correct proximity.
CAUTION: Be careful not to damage  
the covered wire between the  
connected sensors.
8. Tighten the Cable Ties for the 
Speed+Distance Sensor, and trim the 
ends of all the cable ties with a scissor 
or diagonal cutter.
NOTE: Bicycles with triple chainring 
cranksets and/or S-bend chainstays may 
require the canting of the Speed+Distance 
Sensor toward the Spoke Magnet in order 
to get both pieces within correct proximity.
The transmitter use 1pc CR2032 3V battery. The battery already installed. The battery typically 
last one year. We highly recommend that you contact the retailer or our customer service 
department if you need to replace them. 
1. Using a coin, twist the battery door counter clockwise until it clicks out of place.
2. Remove the old battery and insert the new battery with the +side upwards.
1. Non-rechargeable and rechargeable batteries must be disposed of properly. For this 
purpose, special containers are provided for non-rechargeable and rechargeable battery 
disposal at communal collection centers.
2. Batteries are extremely dangerous when swallowed! Therefore, keep batteries and small 
articles away from children. If a battery has been swallowed seek immediate medical 
advice.
3. The batteries supplied must not be recharged, reactivated by any other means, 
dismantled, put into fire or short-circuited. 
A. This device is a Bluetooth Smart and ANT+ device compatible with many smart 
Phones  including:
a) iPhone 4S and newer
b) New iPad and newer 
c) iPad mini
d) iPod Touch5 and newer
e) GALAXY A3,A5,S4,S5,Note3,etc 
f) Xperia E3,Z3,C3,T3,X8,5L.etc
B. In addition, this device is also recommended to work with the following APPs: 
a) Wahoofitness
b) Strava 
c) MapMyRide 
* All brand names and trademarks are properties of their respective owners.
 Why my App cannot connect to the Speed&Cadence sensor?
1. Please confirm the Bluetooth/ANT+  and the Speed & Cadence  function in your App is open.
2. If you are not using  an APP, please confirm the App you using can support Bluetooth  
Smart/ANT+.
3. The Bike Speed & Cadence Sensor Bluetooth/ANT+ sync  function will be automatically shut 
down when there is no Bluetooth/ANT+ connection, please rotate the crank to turn on the  
sensor and launch the connection, the sensor will be on for 1  min after benign waked up, if  
there is no connection from the App during the time, the sensor will go into sleep mode.
4. Please confirm the distances from the sensor and your mobile phone is within 2 meters.
5. Please check the battery installed in the sensor, exchange the battery if it is dead. 
RPM sensor
speed 
transmitter
A
B
C
D
E
Bike Cadence Sensor
Bike Speed+
Distance 
Sensor
Spoke Magnet
Rubber Pad
Cadence Magnet
BATTERIES
IMPORTANT
SUPPORTED DEVICE
TROUBLESHOOTING
123
9. Refer to the APP instructions to pair and calibrate it with Bike Speed&Cadence Sensor 
and to display its data on the APP.
10. Periodically check the cable ties and spoke screw to make sure that they are secure.
A
A
B
B
D
E
B