diff --git a/src/ConfigDialog.cpp b/src/ConfigDialog.cpp
index 5be1df024..21fc81cc3 100644
--- a/src/ConfigDialog.cpp
+++ b/src/ConfigDialog.cpp
@@ -181,6 +181,7 @@ void ConfigDialog::save_Clicked()
     settings->setValue(GC_STS_DAYS, cyclistPage->perfManSTSavg->text());
     settings->setValue(GC_LTS_DAYS, cyclistPage->perfManLTSavg->text());
     settings->setValue(GC_SB_TODAY, (int) cyclistPage->showSBToday->isChecked());
+    settings->setValue(GC_PM_DAYS, cyclistPage->perfManDays->text());
 
     // set default stress names if not set:
     settings->setValue(GC_STS_NAME, settings->value(GC_STS_NAME,tr("Short Term Stress")));
diff --git a/src/Pages.cpp b/src/Pages.cpp
index 3b128ab20..2f1043691 100644
--- a/src/Pages.cpp
+++ b/src/Pages.cpp
@@ -262,12 +262,17 @@ CyclistPage::CyclistPage(MainWindow *main) :
     perfManStartLabel = new QLabel(tr("Starting LTS"));
     perfManSTSLabel = new QLabel(tr("STS average (days)"));
     perfManLTSLabel = new QLabel(tr("LTS average (days)"));
+    perfManDaysLabel = new QLabel(tr("Default range (days)"));
     perfManStartValidator = new QIntValidator(0,200,this);
     perfManSTSavgValidator = new QIntValidator(1,21,this);
     perfManLTSavgValidator = new QIntValidator(7,56,this);
+    perfManDaysValidator = new QIntValidator(1,182,this);
     QVariant perfManStartVal = settings->value(GC_INITIAL_STS);
     QVariant perfManSTSVal = settings->value(GC_STS_DAYS);
+    QVariant perfManDaysVal = settings->value(GC_PM_DAYS);
 
+    if (perfManDaysVal.isNull() || perfManDaysVal.toInt() == 0)
+        perfManDaysVal = 182;
     if (perfManSTSVal.isNull() || perfManSTSVal.toInt() == 0)
 	perfManSTSVal = 7;
     QVariant perfManLTSVal = settings->value(GC_LTS_DAYS);
@@ -279,12 +284,17 @@ CyclistPage::CyclistPage(MainWindow *main) :
     perfManSTSavg->setValidator(perfManSTSavgValidator);
     perfManLTSavg = new QLineEdit(perfManLTSVal.toString(),this);
     perfManLTSavg->setValidator(perfManLTSavgValidator);
+    perfManDays = new QLineEdit(perfManDaysVal.toString(),this);
+    perfManDays->setValidator(perfManDaysValidator);
 
     // performance manager
     perfManLayout = new QVBoxLayout(); // outer
     perfManStartValLayout = new QHBoxLayout();
     perfManSTSavgLayout = new QHBoxLayout();
     perfManLTSavgLayout = new QHBoxLayout();
+    perfManDaysLayout = new QHBoxLayout();
+    perfManDaysLayout->addWidget(perfManDaysLabel);
+    perfManDaysLayout->addWidget(perfManDays);
     perfManStartValLayout->addWidget(perfManStartLabel);
     perfManStartValLayout->addWidget(perfManStart);
     perfManSTSavgLayout->addWidget(perfManSTSLabel);
@@ -292,6 +302,7 @@ CyclistPage::CyclistPage(MainWindow *main) :
     perfManLTSavgLayout->addWidget(perfManLTSLabel);
     perfManLTSavgLayout->addWidget(perfManLTSavg);
     perfManLayout->addWidget(showSBToday);
+    perfManLayout->addLayout(perfManDaysLayout);
     perfManLayout->addLayout(perfManStartValLayout);
     perfManLayout->addLayout(perfManSTSavgLayout);
     perfManLayout->addLayout(perfManLTSavgLayout);
diff --git a/src/Pages.h b/src/Pages.h
index bca4dc58f..844debf05 100644
--- a/src/Pages.h
+++ b/src/Pages.h
@@ -96,9 +96,11 @@ class CyclistPage : public QWidget
         QLabel *perfManStartLabel;
         QLabel *perfManSTSLabel;
         QLabel *perfManLTSLabel;
+        QLabel *perfManDaysLabel;
         QLineEdit *perfManStart;
         QLineEdit *perfManSTSavg;
         QLineEdit *perfManLTSavg;
+        QLineEdit *perfManDays;
         QCheckBox *showSBToday;
 
     private:
@@ -112,11 +114,13 @@ class CyclistPage : public QWidget
         QHBoxLayout *perfManStartValLayout;
         QHBoxLayout *perfManSTSavgLayout;
         QHBoxLayout *perfManLTSavgLayout;
+        QHBoxLayout *perfManDaysLayout;
         QVBoxLayout *cyclistLayout;
         QVBoxLayout *mainLayout;
         QIntValidator *perfManStartValidator;
         QIntValidator *perfManSTSavgValidator;
         QIntValidator *perfManLTSavgValidator;
+        QIntValidator *perfManDaysValidator;
 };
 
 class deviceModel : public QAbstractTableModel
diff --git a/src/PerformanceManagerWindow.cpp b/src/PerformanceManagerWindow.cpp
index 2ff9e831e..995545456 100644
--- a/src/PerformanceManagerWindow.cpp
+++ b/src/PerformanceManagerWindow.cpp
@@ -223,8 +223,8 @@ void PerformanceManagerWindow::replot()
 
 		// set slider values  only on the first time
 		// set left slider to last 6 months
-		if (newdays > 182)
-		    PMleftSlider->setValue(newdays - 182);
+		if (newdays > (settings->value(GC_PM_DAYS)).toInt())
+		    PMleftSlider->setValue(newdays - (settings->value(GC_PM_DAYS).toInt()));
 		else
 		    PMleftSlider->setValue(0);
 
diff --git a/src/Settings.h b/src/Settings.h
index 37a9e9205..b6909538b 100644
--- a/src/Settings.h
+++ b/src/Settings.h
@@ -52,6 +52,7 @@
 #define GC_BIKESCOREDAYS	    "bikeScoreDays"
 #define GC_BIKESCOREMODE	    "bikeScoreMode"
 #define GC_SB_TODAY             "PMshowSBtoday"
+#define GC_PM_DAYS              "pmDays"
 #define GC_INITIAL_LTS		    "initialLTS"
 #define GC_INITIAL_STS		    "initialSTS"
 #define GC_LTS_DAYS		    "LTSdays"