Convert your old Garmin Vector 3/3S to SPD for your Gravel/MTB/Commuting bike with the Garmin Rally XC Conversion kit. In stock now at £219.99... | By Cyclepowermeters Limited | Facebook | Hi,
Garmin Rally™ RS Conversion Kit
How to: Convert Vector 3 to Rally SPD-SL/SPD Pedals! - YouTube
New Garmin Rally power meter series with SPD compatibility – Garmin announces Vector 3 power meter successor | GRAN FONDO Cycling Magazine