Updated example and screenshot.

example.kv

@@ -1,4 +1,4 @@
-#:kivy 2.0
+#:kivy 1.0
 
 <Knob>:
     size_hint: None, None
@@ -10,6 +10,32 @@
 <BlackKnob@Knob>:
     knobimg_source: "img/knob_black.png"
 
+<DecimalTickKnob>:
+    size_hint: None, None
+    size: 150, 150
+    min: 0
+    max: 10
+    value: 0
+    start_angle: 225
+    angle_range: 270
+    knobimg_source: "img/knob_black3.png"
+    knobimg_size: 0.7
+    markeroff_color: 0, 0, 0, 1
+    show_marker: False
+
+<SymmetricTickKnob>:
+    size_hint: None, None
+    size: 150, 150
+    min: -50
+    max: 50
+    value: 0
+    start_angle: 225
+    angle_range: 270
+    knobimg_source: "img/knob_black3.png"
+    knobimg_size: 0.7
+    markeroff_color: 0, 0, 0, 1
+    show_marker: False
+
 <RangeTickKnob>:
     size_hint: None, None
     size: 150, 150
@@ -122,11 +148,10 @@ GridLayout:
         ValueLabel:
             text: "%d" % testknob2.value
 
-    BoxLayout:
-        orientation: 'vertical'
-        size_hint: None, None
-        size: 150,200
-        RangeTickKnob:
-            id: testknob3
-        ValueLabel:
-            text: "%d" % testknob3.value
+    Widget:
+
+    DecimalTickKnob:
+
+    SymmetricTickKnob:
+
+    RangeTickKnob:

example.py

@@ -9,6 +9,37 @@
 else:
     from kivy.garde.knob import Knob, KnobWithTicks, Tick
 
+from kivy.config import Config
+Config.set('graphics', 'width', '650')
+Config.set('graphics', 'height', '900')
+Config.set('graphics', 'resizable', False)
+Config.set('input', 'mouse', 'mouse,multitouch_on_demand')
+
+class DecimalTickKnob(KnobWithTicks):
+    def __init__(self, *args, **kwargs):
+        ticks = []
+        for i in range(0,11,2):
+            ticks.append(Tick(value=i))
+            ticks.append(Tick(value=i, text=str(i), distance=25))
+        for i in range(1,10,2):
+            ticks.append(Tick(value=i, size=(3,5)))
+        super().__init__(ticks, *args, **kwargs)
+
+class SymmetricTickKnob(KnobWithTicks):
+    def __init__(self, *args, **kwargs):
+        ticks = [
+            Tick(value=-50),
+            Tick(value=-50, text="-50", distance=25),
+            Tick(value=-25),
+            Tick(value=-25, text="-25", distance=25),
+            Tick(value=0),
+            Tick(value=0, text="0", distance=25),
+            Tick(value=25),
+            Tick(value=25, text="25", distance=25),
+            Tick(value=50),
+            Tick(value=50, text="50", distance=25),
+        ]
+        super().__init__(ticks, *args, **kwargs)
 
 class RangeTickKnob(KnobWithTicks):
     def __init__(self, *args, **kwargs):

knob.py

@@ -16,7 +16,7 @@
 """
 
 __all__     = ('Knob',)
-__version__ = '0.2'
+__version__ = '0.3'
 
 import math