BuddyPress.org

@lunakm: rather than modifying the core code, which will need changing every time BP is upgraded, you might be better trying to do it as a filter.

I suspect the filter you’d want to work with is bp_core_fetch_avatar_url. Try hooking a function onto this (in your bp-custom.php file) that appends the &r=x to the url.

It might be worth raising it as an enhancement request for future BP releases, to give more control over the parameters that can be passed to Gravatar.

Cheers, Roger