diff --git a/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertHit.cs b/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertHit.cs
index 0db5a1dff1..6bf28c5e45 100644
--- a/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertHit.cs
+++ b/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertHit.cs
@@ -13,5 +13,7 @@ namespace osu.Game.Rulesets.Objects.Legacy.Mania
         public float X { get; set; }
 
         public bool NewCombo { get; set; }
+
+        protected override HitWindows CreateHitWindows() => new ConvertManiaHitWindows();
     }
 }
diff --git a/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertHold.cs b/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertHold.cs
index e3b35e2f8e..087e5d5c12 100644
--- a/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertHold.cs
+++ b/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertHold.cs
@@ -12,5 +12,7 @@ namespace osu.Game.Rulesets.Objects.Legacy.Mania
         public double EndTime { get; set; }
 
         public double Duration => EndTime - StartTime;
+
+        protected override HitWindows CreateHitWindows() => new ConvertManiaHitWindows();
     }
 }
diff --git a/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertManiaHitWindows.cs b/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertManiaHitWindows.cs
new file mode 100644
index 0000000000..072b45dc64
--- /dev/null
+++ b/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertManiaHitWindows.cs
@@ -0,0 +1,32 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System.Collections.Generic;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Scoring;
+
+namespace osu.Game.Rulesets.Objects.Legacy.Mania
+{
+    public class ConvertManiaHitWindows : HitWindows
+    {
+        private static readonly IReadOnlyDictionary<HitResult, (double od0, double od5, double od10)> base_ranges = new Dictionary<HitResult, (double, double, double)>
+        {
+            { HitResult.Perfect, (44.8, 38.8, 27.8) },
+            { HitResult.Great, (128, 98, 68 ) },
+            { HitResult.Good, (194, 164, 134) },
+            { HitResult.Ok, (254, 224, 194) },
+            { HitResult.Meh, (302, 272, 242) },
+            { HitResult.Miss, (376, 346, 316) },
+        };
+
+        public override void SetDifficulty(double difficulty)
+        {
+            Perfect = BeatmapDifficulty.DifficultyRange(difficulty, base_ranges[HitResult.Perfect]);
+            Great = BeatmapDifficulty.DifficultyRange(difficulty, base_ranges[HitResult.Great]);
+            Good = BeatmapDifficulty.DifficultyRange(difficulty, base_ranges[HitResult.Good]);
+            Ok = BeatmapDifficulty.DifficultyRange(difficulty, base_ranges[HitResult.Ok]);
+            Meh = BeatmapDifficulty.DifficultyRange(difficulty, base_ranges[HitResult.Meh]);
+            Miss = BeatmapDifficulty.DifficultyRange(difficulty, base_ranges[HitResult.Miss]);
+        }
+    }
+}
diff --git a/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertSlider.cs b/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertSlider.cs
index 32fb197c62..08ce465619 100644
--- a/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertSlider.cs
+++ b/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertSlider.cs
@@ -13,5 +13,7 @@ namespace osu.Game.Rulesets.Objects.Legacy.Mania
         public float X { get; set; }
 
         public bool NewCombo { get; set; }
+
+        protected override HitWindows CreateHitWindows() => new ConvertManiaHitWindows();
     }
 }
diff --git a/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertSpinner.cs b/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertSpinner.cs
index c9b3046698..031ba54c59 100644
--- a/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertSpinner.cs
+++ b/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertSpinner.cs
@@ -15,5 +15,7 @@ namespace osu.Game.Rulesets.Objects.Legacy.Mania
         public double Duration => EndTime - StartTime;
 
         public float X { get; set; }
+
+        protected override HitWindows CreateHitWindows() => new ConvertManiaHitWindows();
     }
 }