How it Works
This automatic feature detects if you recorded an activity at the same time as other users on the same route. When a group activity is detected, your activity becomes linked to any matching activities. On your feed, the group activity is displayed with one map and a list of the group members you follow below. When viewing an activity details page, you will be able to view the full list of athletes matched in the group. In order to be detected as a group activity, our algorithm considers the percentage of elapsed time in your activity that the other activity is 'nearby.' If the other activity is nearby for more than 50% of the time, it is considered a match. This threshold allows for other users to join a group ride or run mid-way through, or leave early as long as they match the set percentage.
- The algorithm is asymmetric. For example, if you join someone for the last 5 miles of their 50-mile ride, it will say that you rode with them, but not that they rode with you. In most cases, however, matching is symmetric.
- The algorithm is activity type agnostic (for example skiing can be matched with snowboarding).
- 'Nearby' means closer than a few hundred meters together. However, this rule is more flexible for longer distance activities.
Long Story Short
We’ll automatically group athletes who have activities taking place at the same time and whose routes are more than 50% similar.
Leaving a Group
Sometimes our servers take a bit of time to complete the grouping process, especially for larger groups. If you are still not seeing your activity grouped after about 12 hours, please check the following:
- If you've set your group activity privacy controls to "No One," no athletes will be grouped to your activity nor will they see you as part of a group.
- If you are a Strava mobile app user, check your device's internal clock settings. If you set your phone's clock manually, your set time could be over 1 minute off from the automatic clock from cell towers/satellites causing you to miss the group activity detection. Instead, try setting your clock to update automatically.
- If you're still having trouble, proceed with submitting a support ticket that includes direct links to your activity and the activities you should be grouped with.
Please be aware that the option to Add Others/Friends does not allow you to retry the automatic grouping nor does it allow you to manually group your activity with other activities that are already on Strava. The Add Others/Friends option allows you to invite a friend who was with you but didn't record their activity on Strava. If the invitation is accepted, your activity will appear on your friend's Strava profile and feed as if it was their own. Learn more about inviting friends to your activity here.