diff --git a/CHANGELOG.md b/CHANGELOG.md
index 57c3650..8cebb59 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,3 +30,9 @@
 ## 1.0.3+3
 
 - Change GitHub workflow badge routes
+
+## 1.1.0
+
+- Modify the formula to get the radius of CircularSeekBar
+
+- Fix bug: Large barWidth with strokeCap round looks odd(#1)
\ No newline at end of file
diff --git a/README.md b/README.md
index e6ed805..8eda13b 100644
--- a/README.md
+++ b/README.md
@@ -254,7 +254,7 @@ Add this to your package's `pubspec.yaml` file:
 
 ```yaml
 dependencies:
-  circular_seek_bar: ^1.0.3
+  circular_seek_bar: ^1.1.0
 ```
 
 or
diff --git a/lib/circular_seek_bar.dart b/lib/circular_seek_bar.dart
index 279d78a..97ddc27 100644
--- a/lib/circular_seek_bar.dart
+++ b/lib/circular_seek_bar.dart
@@ -437,10 +437,11 @@ class _SeekBarPainter extends CustomPainter {
 
       final Offset center = Offset(size.width / 2, size.height / 2);
       final double largerThumbWidth =
-          barWidth >= (outerThumbRadius + (outerThumbStrokeWidth / 2))
-              ? barWidth
-              : (outerThumbRadius + (outerThumbStrokeWidth / 2));
-      final double radius = min(center.dx, center.dy) - largerThumbWidth;
+          (outerThumbRadius / 2 + outerThumbStrokeWidth / 2) >= (innerThumbRadius / 2 + innerThumbStrokeWidth / 2)
+              ? (outerThumbRadius / 2 + outerThumbStrokeWidth / 2)
+              : (innerThumbRadius / 2 + innerThumbStrokeWidth / 2);
+      final double seekBarMargin = largerThumbWidth >= (barWidth / 2) ? largerThumbWidth : barWidth / 2;
+      final double radius = min(center.dx, center.dy) - seekBarMargin;
       double realStartAngle = startAngle + angleOffset;
 
       double startAngleWithOffsetRadian = _degreesToRadians(realStartAngle);
@@ -457,7 +458,7 @@ class _SeekBarPainter extends CustomPainter {
           endAngle: sweepAngleRadian,
           tileMode: TileMode.mirror,
           colors: trackGradientColors,
-          transform: GradientRotation(startAngleWithOffsetRadian - 0.1),
+          transform: GradientRotation(startAngleWithOffsetRadian - asin((barWidth / 2) / radius)),
         );
         trackPaint.shader = trackGradient.createShader(rect);
       }
@@ -469,7 +470,7 @@ class _SeekBarPainter extends CustomPainter {
           endAngle: sweepAngleRadian,
           tileMode: TileMode.mirror,
           colors: progressGradientColors,
-          transform: GradientRotation(startAngleWithOffsetRadian - 0.1),
+          transform: GradientRotation(startAngleWithOffsetRadian - asin((barWidth / 2) / radius)),
         );
 
         progressPaint.shader = progressGradient.createShader(rect);
diff --git a/pubspec.yaml b/pubspec.yaml
index 0d145c9..b960067 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: circular_seek_bar
 description: Circular progress/seek bar package for flutter that supports customizable animations, dashes, and gradients.
-version: 1.0.3+3
+version: 1.1.0
 repository: https://github.com/seosh817/Flutter_CircularSeekBar
 
 environment: