Cateye Strada Smart CC-RD500B Online Manual page 84

When smart computer displays [FULL] on the screen and returns to the menu:
Up to 9 separate sensor IDs can be paired with smart computer. If the maximum number
of sensors have been paired, with the computer in pairing standby state, press MENU
for 4 seconds to clear all pairings.
* Pairing standby time is 5 minutes. Activate the sensor within this time.
4. Press MENU to confirm pairing.
If you want to continue pairing another sensor, repeat the same operations again.
Pressing MENU again returns to the measurement screen.
* If you have changed settings, always press MENU to confirm changes.
Important
Tire circumference setting