diff --git a/libraries/Wire/src/Wire.cpp b/libraries/Wire/src/Wire.cpp
index 10ee740..6444402 100644
--- a/libraries/Wire/src/Wire.cpp
+++ b/libraries/Wire/src/Wire.cpp
@@ -295,7 +295,9 @@ extern "C" void __attribute__((optimize("O3"))) wire_interrupt_handler(uint8_t n
 }
 
 // ----------------------------- Preinstantiate Objects ----------------------------- //
-TwoWire Wire = TwoWire(1); 
-#if I2C_COMMON_QTY>1
-TwoWire Wire1 = TwoWire(0); 
+TwoWire Wire1 = TwoWire(1); // I2C1 is always available
+#if I2C_COMMON_QTY > 1
+TwoWire Wire0 = TwoWire(0); // I2C0 is available on some boards
 #endif
+// default interface
+TwoWire& Wire = DEFAULT_WIRE;
diff --git a/libraries/Wire/src/Wire.h b/libraries/Wire/src/Wire.h
index ca62b8e..9296644 100644
--- a/libraries/Wire/src/Wire.h
+++ b/libraries/Wire/src/Wire.h
@@ -90,9 +90,11 @@ class TwoWire : public Stream
     void onRequest( void (*)(void) );
 };
 
-extern TwoWire Wire;
-#if I2C_COMMON_QTY>1
 extern TwoWire Wire1;
+#if I2C_COMMON_QTY>1
+extern TwoWire Wire0;
 #endif
+// default interface
+extern TwoWire& Wire;
 
 #endif
diff --git a/variants/elbear_ace_nano/pins_arduino.h b/variants/elbear_ace_nano/pins_arduino.h
index c1e19df..e04ad86 100644
--- a/variants/elbear_ace_nano/pins_arduino.h
+++ b/variants/elbear_ace_nano/pins_arduino.h
@@ -131,9 +131,10 @@ void spi_onBegin(uint8_t spiNum);
 void spi_onEnd(uint8_t spiNum);
 
 // I2C
+#define I2C_COMMON_QTY  1
+#define DEFAULT_WIRE    Wire1 // use I2C1 by default
 #define PIN_WIRE_SDA    18
 #define PIN_WIRE_SCL    19
-#define I2C_COMMON_QTY  1
 static const uint8_t    SDA = PIN_WIRE_SDA;
 static const uint8_t    SCL = PIN_WIRE_SCL;
 // available frequencies
diff --git a/variants/elbear_ace_uno/pins_arduino.h b/variants/elbear_ace_uno/pins_arduino.h
index 553ed21..dea17b3 100644
--- a/variants/elbear_ace_uno/pins_arduino.h
+++ b/variants/elbear_ace_uno/pins_arduino.h
@@ -125,9 +125,10 @@ void spi_onBegin(uint8_t spiNum);
 void spi_onEnd(uint8_t spiNum);
 
 // I2C
+#define I2C_COMMON_QTY  (1)
+#define DEFAULT_WIRE    Wire1 // use I2C1 by default
 #define PIN_WIRE_SDA    (18)
 #define PIN_WIRE_SCL    (19)
-#define I2C_COMMON_QTY  (1)
 static const uint8_t SDA = PIN_WIRE_SDA;
 static const uint8_t SCL = PIN_WIRE_SCL;
 // available frequencies
diff --git a/variants/elsomik/pins_arduino.h b/variants/elsomik/pins_arduino.h
index 282f608..af3c02a 100644
--- a/variants/elsomik/pins_arduino.h
+++ b/variants/elsomik/pins_arduino.h
@@ -155,12 +155,13 @@ static inline void spi_onEnd(uint8_t spiNum){}
 
 // I2C
 #define I2C_COMMON_QTY    2
-// Wire (I2C1)
+#define DEFAULT_WIRE      Wire0 // use I2C0 by default
+// Wire1 (I2C1)
 #define PIN_WIRE_SDA      P1_12
 #define PIN_WIRE_SCL      P1_13
 static const uint8_t      SDA = PIN_WIRE_SDA;
 static const uint8_t      SCL = PIN_WIRE_SCL;
-// Wire1 (I2C0)
+// Wire0 (I2C0)
 #define PIN_WIRE_SDA1     P0_9
 #define PIN_WIRE_SCL1     P0_10
 static const uint8_t      SDA1 = PIN_WIRE_SDA1;
diff --git a/variants/start/pins_arduino.h b/variants/start/pins_arduino.h
index f785196..d3c7aa4 100644
--- a/variants/start/pins_arduino.h
+++ b/variants/start/pins_arduino.h
@@ -168,12 +168,13 @@ static inline void spi_onEnd(uint8_t spiNum){}
 
 // I2C
 #define I2C_COMMON_QTY    2
-// Wire (I2C1)
+#define DEFAULT_WIRE      Wire0 // use I2C0 by default
+// Wire1 (I2C1)
 #define PIN_WIRE_SDA      P1_12
 #define PIN_WIRE_SCL      P1_13
 static const uint8_t      SDA = PIN_WIRE_SDA;
 static const uint8_t      SCL = PIN_WIRE_SCL;
-// Wire1 (I2C0)
+// Wire0 (I2C0)
 #define PIN_WIRE_SDA1     P0_9
 #define PIN_WIRE_SCL1     P0_10
 static const uint8_t      SDA1 = PIN_WIRE_SDA1;