diff --git a/infra/config/global/generated/cr-buildbucket.cfg b/infra/config/global/generated/cr-buildbucket.cfg
index 443ac98..f55becc 100644
--- a/infra/config/global/generated/cr-buildbucket.cfg
+++ b/infra/config/global/generated/cr-buildbucket.cfg
@@ -9,10 +9,6 @@
   acls {
     group: "all"
   }
-  acls {
-    role: SCHEDULER
-    identity: "user:luci-scheduler@appspot.gserviceaccount.com"
-  }
   swarming {
     builders {
       name: "linux-clang-dbg-x64"
@@ -30,6 +26,10 @@
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "linux-clang-dbg-x86"
@@ -47,6 +47,10 @@
         properties_j: "target_cpu:\"x86\""
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "linux-clang-rel-x64"
@@ -64,6 +68,10 @@
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "linux-clang-rel-x86"
@@ -81,6 +89,10 @@
         properties_j: "target_cpu:\"x86\""
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "mac-dbg"
@@ -103,6 +115,10 @@
         path: "osx_sdk"
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "mac-rel"
@@ -125,6 +141,10 @@
         path: "osx_sdk"
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "win-clang-dbg-x64"
@@ -146,6 +166,10 @@
         path: "win_toolchain"
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "win-clang-dbg-x86"
@@ -167,6 +191,10 @@
         path: "win_toolchain"
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "win-clang-rel-x64"
@@ -188,6 +216,10 @@
         path: "win_toolchain"
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "win-clang-rel-x86"
@@ -209,6 +241,10 @@
         path: "win_toolchain"
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "win-msvc-dbg-x64"
@@ -225,6 +261,10 @@
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "win-msvc-rel-x64"
@@ -241,6 +281,10 @@
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
   }
 }
@@ -275,6 +319,10 @@
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "linux-clang-dbg-x86"
@@ -293,6 +341,10 @@
         properties_j: "target_cpu:\"x86\""
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "linux-clang-rel-x64"
@@ -311,6 +363,10 @@
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "linux-clang-rel-x86"
@@ -329,6 +385,10 @@
         properties_j: "target_cpu:\"x86\""
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "mac-dbg"
@@ -352,6 +412,10 @@
         path: "osx_sdk"
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "mac-rel"
@@ -375,6 +439,10 @@
         path: "osx_sdk"
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "presubmit"
@@ -391,6 +459,10 @@
         properties_j: "runhooks:true"
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "win-clang-dbg-x64"
@@ -413,6 +485,10 @@
         path: "win_toolchain"
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "win-clang-dbg-x86"
@@ -435,6 +511,10 @@
         path: "win_toolchain"
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "win-clang-rel-x64"
@@ -457,6 +537,10 @@
         path: "win_toolchain"
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "win-clang-rel-x86"
@@ -479,6 +563,10 @@
         path: "win_toolchain"
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "win-msvc-dbg-x64"
@@ -496,6 +584,10 @@
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
     builders {
       name: "win-msvc-rel-x64"
@@ -513,6 +605,10 @@
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.use_realms"
+        value: 0
+      }
     }
   }
 }
diff --git a/infra/config/global/generated/luci-scheduler.cfg b/infra/config/global/generated/luci-scheduler.cfg
index 6735c7a..b58acab 100644
--- a/infra/config/global/generated/luci-scheduler.cfg
+++ b/infra/config/global/generated/luci-scheduler.cfg
@@ -6,6 +6,7 @@
 
 job {
   id: "linux-clang-dbg-x64"
+  realm: "ci"
   acl_sets: "ci"
   buildbucket {
     server: "cr-buildbucket.appspot.com"
@@ -15,6 +16,7 @@
 }
 job {
   id: "linux-clang-dbg-x86"
+  realm: "ci"
   acl_sets: "ci"
   buildbucket {
     server: "cr-buildbucket.appspot.com"
@@ -24,6 +26,7 @@
 }
 job {
   id: "linux-clang-rel-x64"
+  realm: "ci"
   acl_sets: "ci"
   buildbucket {
     server: "cr-buildbucket.appspot.com"
@@ -33,6 +36,7 @@
 }
 job {
   id: "linux-clang-rel-x86"
+  realm: "ci"
   acl_sets: "ci"
   buildbucket {
     server: "cr-buildbucket.appspot.com"
@@ -42,6 +46,7 @@
 }
 job {
   id: "mac-dbg"
+  realm: "ci"
   acl_sets: "ci"
   buildbucket {
     server: "cr-buildbucket.appspot.com"
@@ -51,6 +56,7 @@
 }
 job {
   id: "mac-rel"
+  realm: "ci"
   acl_sets: "ci"
   buildbucket {
     server: "cr-buildbucket.appspot.com"
@@ -60,6 +66,7 @@
 }
 job {
   id: "win-clang-dbg-x64"
+  realm: "ci"
   acl_sets: "ci"
   buildbucket {
     server: "cr-buildbucket.appspot.com"
@@ -69,6 +76,7 @@
 }
 job {
   id: "win-clang-dbg-x86"
+  realm: "ci"
   acl_sets: "ci"
   buildbucket {
     server: "cr-buildbucket.appspot.com"
@@ -78,6 +86,7 @@
 }
 job {
   id: "win-clang-rel-x64"
+  realm: "ci"
   acl_sets: "ci"
   buildbucket {
     server: "cr-buildbucket.appspot.com"
@@ -87,6 +96,7 @@
 }
 job {
   id: "win-clang-rel-x86"
+  realm: "ci"
   acl_sets: "ci"
   buildbucket {
     server: "cr-buildbucket.appspot.com"
@@ -96,6 +106,7 @@
 }
 job {
   id: "win-msvc-dbg-x64"
+  realm: "ci"
   acl_sets: "ci"
   buildbucket {
     server: "cr-buildbucket.appspot.com"
@@ -105,6 +116,7 @@
 }
 job {
   id: "win-msvc-rel-x64"
+  realm: "ci"
   acl_sets: "ci"
   buildbucket {
     server: "cr-buildbucket.appspot.com"
@@ -114,6 +126,7 @@
 }
 trigger {
   id: "primary-poller"
+  realm: "ci"
   acl_sets: "ci"
   triggers: "linux-clang-dbg-x64"
   triggers: "linux-clang-dbg-x86"
diff --git a/infra/config/global/generated/realms.cfg b/infra/config/global/generated/realms.cfg
new file mode 100644
index 0000000..de88dd2
--- /dev/null
+++ b/infra/config/global/generated/realms.cfg
@@ -0,0 +1,56 @@
+# Auto-generated by lucicfg.
+# Do not modify manually.
+#
+# For the schema of this file, see RealmsCfg message:
+#   https://luci-config.appspot.com/schemas/projects:realms.cfg
+
+realms {
+  name: "@root"
+  bindings {
+    role: "role/buildbucket.reader"
+    principals: "group:all"
+  }
+  bindings {
+    role: "role/configs.reader"
+    principals: "group:all"
+  }
+  bindings {
+    role: "role/logdog.reader"
+    principals: "group:all"
+  }
+  bindings {
+    role: "role/logdog.writer"
+    principals: "group:luci-logdog-chromium-writers"
+  }
+  bindings {
+    role: "role/scheduler.owner"
+    principals: "group:project-tint-admins"
+  }
+  bindings {
+    role: "role/scheduler.reader"
+    principals: "group:all"
+  }
+}
+realms {
+  name: "ci"
+  bindings {
+    role: "role/buildbucket.builderServiceAccount"
+    principals: "user:tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+  }
+  bindings {
+    role: "role/buildbucket.reader"
+    principals: "group:all"
+  }
+}
+realms {
+  name: "try"
+  bindings {
+    role: "role/buildbucket.builderServiceAccount"
+    principals: "user:tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+  }
+  bindings {
+    role: "role/buildbucket.triggerer"
+    principals: "group:project-tint-tryjob-access"
+    principals: "group:service-account-cq"
+  }
+}
diff --git a/infra/config/global/main.star b/infra/config/global/main.star
old mode 100644
new mode 100755
index 2fb6170..e684771
--- a/infra/config/global/main.star
+++ b/infra/config/global/main.star
@@ -8,6 +8,11 @@
 main.star: lucicfg configuration for Tint's standalone builers.
 """
 
+# Enable realms experiment.
+lucicfg.enable_experiment("crbug.com/1085650")
+# TODO(https://crbug.com/1216166): ramp up to 100%.
+luci.builder.defaults.experiments.set({"luci.use_realms": 0})
+
 lucicfg.config(fail_on_warnings = True)
 
 luci.project(
@@ -56,9 +61,6 @@
         ),
         acl.entry(
             acl.BUILDBUCKET_TRIGGERER,
-            users = [
-                "luci-scheduler@appspot.gserviceaccount.com",
-            ],
         ),
     ],
 )