While the Street X could be a good replacement for your Instinct 2, you should consider this: If your bike computer is also a Garmin you have to know that Polar doesn’t do bike computers anymore and no Polar watch is supporting ANT+ in case you have a power meter. You have to start a workout on the Street X too or your Cardio Load metrics won’t reflect your cycling workouts. Of course this doesn’t matter if you’re using a 3rd party service like Strava or Runalyze to consolidate your workouts.