diff --git a/src/consts/mod.rs b/src/consts/mod.rs
index 4793745..08ee694 100644
--- a/src/consts/mod.rs
+++ b/src/consts/mod.rs
@@ -20,3 +20,6 @@ pub use season::*;
 
 mod team;
 pub use team::*;
+
+mod tier;
+pub use tier::*;
diff --git a/src/consts/tier.rs b/src/consts/tier.rs
new file mode 100644
index 0000000..e9aeaf7
--- /dev/null
+++ b/src/consts/tier.rs
@@ -0,0 +1,37 @@
+#![allow(deprecated)]
+
+use std::fmt::Debug;
+
+use strum_macros::{ EnumString, Display, AsRefStr };
+
+#[derive(Debug, Copy, Clone)]
+#[derive(Eq, PartialEq, Hash, PartialOrd, Ord)]
+#[derive(EnumString, Display, AsRefStr)]
+#[repr(u8)]
+pub enum Tier {
+    #[strum(to_string="IRON")]        Iron        =  40,
+    #[strum(to_string="BRONZE")]      Bronze      =  60,
+    #[strum(to_string="SILVER")]      Silver      =  80,
+    #[strum(to_string="GOLD")]        Gold        = 100,
+    #[strum(to_string="PLATINUM")]    Platinum    = 120,
+    #[strum(to_string="DIAMOND")]     Diamond     = 140,
+    #[strum(to_string="MASTER")]      Master      = 200,
+    #[strum(to_string="GRANDMASTER")] Grandmaster = 220,
+    #[strum(to_string="CHALLENGER")]  Challenger  = 240,
+}
+
+impl Tier {
+    /// If this tier is "standard".
+    /// Standard means non-apex (not master+), and not unranked.
+    ///
+    /// Only these tiers are queryable by LeagueV4Endpoints::get_league_entries(...).
+    pub fn is_standard_tier(self) -> bool {
+        self < Self::Master
+    }
+
+    /// If this tier is an apex tier.
+    /// Master and above.
+    pub fn is_apex_tier(self) -> bool {
+        Self::Master <= self
+    }
+}