diff --git a/cocotbext/axi/stream.py b/cocotbext/axi/stream.py
index 74c5016..ee3636b 100644
--- a/cocotbext/axi/stream.py
+++ b/cocotbext/axi/stream.py
@@ -137,20 +137,11 @@ class StreamPause:
 
 class StreamSource(StreamBase, StreamPause):
 
-    _signals = ["data", "valid", "ready"]
-    _optional_signals = []
-
-    _signal_widths = {"valid": 1, "ready": 1}
-
     _init_x = True
 
-    _valid_signal = "valid"
     _valid_init = 0
-    _ready_signal = "ready"
     _ready_init = None
 
-    _transaction_obj = StreamTransaction
-
     def __init__(self, entity, name, clock, reset=None, *args, **kwargs):
         super().__init__(entity, name, clock, reset, *args, **kwargs)
 
@@ -227,20 +218,11 @@ class StreamSource(StreamBase, StreamPause):
 
 class StreamSink(StreamBase, StreamPause):
 
-    _signals = ["data", "valid", "ready"]
-    _optional_signals = []
-
-    _signal_widths = {"valid": 1, "ready": 1}
-
     _init_x = False
 
-    _valid_signal = "valid"
     _valid_init = None
-    _ready_signal = "ready"
     _ready_init = 0
 
-    _transaction_obj = StreamTransaction
-
     def __init__(self, entity, name, clock, reset=None, *args, **kwargs):
         super().__init__(entity, name, clock, reset, *args, **kwargs)
 
@@ -295,20 +277,11 @@ class StreamSink(StreamBase, StreamPause):
 
 class StreamMonitor(StreamBase):
 
-    _signals = ["data", "valid", "ready"]
-    _optional_signals = []
-
-    _signal_widths = {"valid": 1, "ready": 1}
-
     _init_x = False
 
-    _valid_signal = "valid"
     _valid_init = None
-    _ready_signal = "ready"
     _ready_init = None
 
-    _transaction_obj = StreamTransaction
-
     def __init__(self, entity, name, clock, reset=None, *args, **kwargs):
         super().__init__(entity, name, clock, reset, *args, **kwargs)