diff --git a/wpimath/src/main/java/edu/wpi/first/math/controller/ArmFeedforward.java b/wpimath/src/main/java/edu/wpi/first/math/controller/ArmFeedforward.java
index 32464ece10..cd66696e50 100644
--- a/wpimath/src/main/java/edu/wpi/first/math/controller/ArmFeedforward.java
+++ b/wpimath/src/main/java/edu/wpi/first/math/controller/ArmFeedforward.java
@@ -16,16 +16,16 @@ import edu.wpi.first.util.struct.StructSerializable;
  */
 public class ArmFeedforward implements ProtobufSerializable, StructSerializable {
   /** The static gain, in volts. */
-  public final double ks;
+  private final double ks;
 
   /** The gravity gain, in volts. */
-  public final double kg;
+  private final double kg;
 
-  /** The velocity gain, in volt seconds per radian. */
-  public final double kv;
+  /** The velocity gain, in V/(rad/s). */
+  private final double kv;
 
-  /** The acceleration gain, in volt seconds² per radian. */
-  public final double ka;
+  /** The acceleration gain, in V/(rad/s²). */
+  private final double ka;
 
   /** Arm feedforward protobuf for serialization. */
   public static final ArmFeedforwardProto proto = new ArmFeedforwardProto();
@@ -69,6 +69,42 @@ public class ArmFeedforward implements ProtobufSerializable, StructSerializable
     this(ks, kg, kv, 0);
   }
 
+  /**
+   * Returns the static gain.
+   *
+   * @return The static gain, in volts.
+   */
+  public double getKs() {
+    return ks;
+  }
+
+  /**
+   * Returns the gravity gain.
+   *
+   * @return The gravity gain, in volts.
+   */
+  public double getKg() {
+    return kg;
+  }
+
+  /**
+   * Returns the velocity gain.
+   *
+   * @return The velocity gain, in V/(rad/s).
+   */
+  public double getKv() {
+    return kv;
+  }
+
+  /**
+   * Returns the acceleration gain.
+   *
+   * @return The acceleration gain, in V/(rad/s²).
+   */
+  public double getKa() {
+    return ka;
+  }
+
   /**
    * Calculates the feedforward from the gains and setpoints.
    *
diff --git a/wpimath/src/main/java/edu/wpi/first/math/controller/ElevatorFeedforward.java b/wpimath/src/main/java/edu/wpi/first/math/controller/ElevatorFeedforward.java
index dc56ece26a..0c943979c0 100644
--- a/wpimath/src/main/java/edu/wpi/first/math/controller/ElevatorFeedforward.java
+++ b/wpimath/src/main/java/edu/wpi/first/math/controller/ElevatorFeedforward.java
@@ -18,16 +18,16 @@ import edu.wpi.first.util.struct.StructSerializable;
  */
 public class ElevatorFeedforward implements ProtobufSerializable, StructSerializable {
   /** The static gain. */
-  public final double ks;
+  private final double ks;
 
   /** The gravity gain. */
-  public final double kg;
+  private final double kg;
 
   /** The velocity gain. */
-  public final double kv;
+  private final double kv;
 
   /** The acceleration gain. */
-  public final double ka;
+  private final double ka;
 
   /** ElevatorFeedforward protobuf for serialization. */
   public static final ElevatorFeedforwardProto proto = new ElevatorFeedforwardProto();
@@ -71,6 +71,42 @@ public class ElevatorFeedforward implements ProtobufSerializable, StructSerializ
     this(ks, kg, kv, 0);
   }
 
+  /**
+   * Returns the static gain.
+   *
+   * @return The static gain.
+   */
+  public double getKs() {
+    return ks;
+  }
+
+  /**
+   * Returns the gravity gain.
+   *
+   * @return The gravity gain.
+   */
+  public double getKg() {
+    return kg;
+  }
+
+  /**
+   * Returns the velocity gain.
+   *
+   * @return The velocity gain.
+   */
+  public double getKv() {
+    return kv;
+  }
+
+  /**
+   * Returns the acceleration gain.
+   *
+   * @return The acceleration gain.
+   */
+  public double getKa() {
+    return ka;
+  }
+
   /**
    * Calculates the feedforward from the gains and setpoints.
    *
diff --git a/wpimath/src/main/java/edu/wpi/first/math/controller/SimpleMotorFeedforward.java b/wpimath/src/main/java/edu/wpi/first/math/controller/SimpleMotorFeedforward.java
index 60accdadf2..f9f86073ee 100644
--- a/wpimath/src/main/java/edu/wpi/first/math/controller/SimpleMotorFeedforward.java
+++ b/wpimath/src/main/java/edu/wpi/first/math/controller/SimpleMotorFeedforward.java
@@ -14,16 +14,16 @@ import edu.wpi.first.units.Voltage;
 /** A helper class that computes feedforward outputs for a simple permanent-magnet DC motor. */
 public class SimpleMotorFeedforward {
   /** The static gain. */
-  public final double ks;
+  private final double ks;
 
   /** The velocity gain. */
-  public final double kv;
+  private final double kv;
 
   /** The acceleration gain. */
-  public final double ka;
+  private final double ka;
 
   /** The period. */
-  private double m_dt;
+  private final double m_dt;
 
   /**
    * Creates a new SimpleMotorFeedforward with the specified gains and period. Units of the gain
@@ -80,6 +80,42 @@ public class SimpleMotorFeedforward {
     this(ks, kv, 0, 0.020);
   }
 
+  /**
+   * Returns the static gain.
+   *
+   * @return The static gain.
+   */
+  public double getKs() {
+    return ks;
+  }
+
+  /**
+   * Returns the velocity gain.
+   *
+   * @return The velocity gain.
+   */
+  public double getKv() {
+    return kv;
+  }
+
+  /**
+   * Returns the acceleration gain.
+   *
+   * @return The acceleration gain.
+   */
+  public double getKa() {
+    return ka;
+  }
+
+  /**
+   * Returns the period.
+   *
+   * @return The period in seconds.
+   */
+  public double getDt() {
+    return m_dt;
+  }
+
   /**
    * Calculates the feedforward from the gains and setpoints.
    *
diff --git a/wpimath/src/main/java/edu/wpi/first/math/controller/proto/ArmFeedforwardProto.java b/wpimath/src/main/java/edu/wpi/first/math/controller/proto/ArmFeedforwardProto.java
index ef3953a54d..fe3ce5757e 100644
--- a/wpimath/src/main/java/edu/wpi/first/math/controller/proto/ArmFeedforwardProto.java
+++ b/wpimath/src/main/java/edu/wpi/first/math/controller/proto/ArmFeedforwardProto.java
@@ -32,9 +32,9 @@ public class ArmFeedforwardProto implements Protobuf<ArmFeedforward, ProtobufArm
 
   @Override
   public void pack(ProtobufArmFeedforward msg, ArmFeedforward value) {
-    msg.setKs(value.ks);
-    msg.setKg(value.kg);
-    msg.setKv(value.kv);
-    msg.setKa(value.ka);
+    msg.setKs(value.getKs());
+    msg.setKg(value.getKg());
+    msg.setKv(value.getKv());
+    msg.setKa(value.getKa());
   }
 }
diff --git a/wpimath/src/main/java/edu/wpi/first/math/controller/proto/ElevatorFeedforwardProto.java b/wpimath/src/main/java/edu/wpi/first/math/controller/proto/ElevatorFeedforwardProto.java
index 66399e1a0c..5ccf70f669 100644
--- a/wpimath/src/main/java/edu/wpi/first/math/controller/proto/ElevatorFeedforwardProto.java
+++ b/wpimath/src/main/java/edu/wpi/first/math/controller/proto/ElevatorFeedforwardProto.java
@@ -33,9 +33,9 @@ public class ElevatorFeedforwardProto
 
   @Override
   public void pack(ProtobufElevatorFeedforward msg, ElevatorFeedforward value) {
-    msg.setKs(value.ks);
-    msg.setKg(value.kg);
-    msg.setKv(value.kv);
-    msg.setKa(value.ka);
+    msg.setKs(value.getKs());
+    msg.setKg(value.getKg());
+    msg.setKv(value.getKv());
+    msg.setKa(value.getKa());
   }
 }
diff --git a/wpimath/src/main/java/edu/wpi/first/math/controller/struct/ArmFeedforwardStruct.java b/wpimath/src/main/java/edu/wpi/first/math/controller/struct/ArmFeedforwardStruct.java
index de72fea1bd..1f967bc0ac 100644
--- a/wpimath/src/main/java/edu/wpi/first/math/controller/struct/ArmFeedforwardStruct.java
+++ b/wpimath/src/main/java/edu/wpi/first/math/controller/struct/ArmFeedforwardStruct.java
@@ -40,9 +40,9 @@ public class ArmFeedforwardStruct implements Struct<ArmFeedforward> {
 
   @Override
   public void pack(ByteBuffer bb, ArmFeedforward value) {
-    bb.putDouble(value.ks);
-    bb.putDouble(value.kg);
-    bb.putDouble(value.kv);
-    bb.putDouble(value.ka);
+    bb.putDouble(value.getKs());
+    bb.putDouble(value.getKg());
+    bb.putDouble(value.getKv());
+    bb.putDouble(value.getKa());
   }
 }
diff --git a/wpimath/src/main/java/edu/wpi/first/math/controller/struct/ElevatorFeedforwardStruct.java b/wpimath/src/main/java/edu/wpi/first/math/controller/struct/ElevatorFeedforwardStruct.java
index f8b5559530..06e2126668 100644
--- a/wpimath/src/main/java/edu/wpi/first/math/controller/struct/ElevatorFeedforwardStruct.java
+++ b/wpimath/src/main/java/edu/wpi/first/math/controller/struct/ElevatorFeedforwardStruct.java
@@ -40,9 +40,9 @@ public class ElevatorFeedforwardStruct implements Struct<ElevatorFeedforward> {
 
   @Override
   public void pack(ByteBuffer bb, ElevatorFeedforward value) {
-    bb.putDouble(value.ks);
-    bb.putDouble(value.kg);
-    bb.putDouble(value.kv);
-    bb.putDouble(value.ka);
+    bb.putDouble(value.getKs());
+    bb.putDouble(value.getKg());
+    bb.putDouble(value.getKv());
+    bb.putDouble(value.getKa());
   }
 }
diff --git a/wpimath/src/main/native/cpp/controller/proto/ArmFeedforwardProto.cpp b/wpimath/src/main/native/cpp/controller/proto/ArmFeedforwardProto.cpp
index 8258ca337d..39c3ab8693 100644
--- a/wpimath/src/main/native/cpp/controller/proto/ArmFeedforwardProto.cpp
+++ b/wpimath/src/main/native/cpp/controller/proto/ArmFeedforwardProto.cpp
@@ -27,8 +27,8 @@ frc::ArmFeedforward wpi::Protobuf<frc::ArmFeedforward>::Unpack(
 void wpi::Protobuf<frc::ArmFeedforward>::Pack(
     google::protobuf::Message* msg, const frc::ArmFeedforward& value) {
   auto m = static_cast<wpi::proto::ProtobufArmFeedforward*>(msg);
-  m->set_ks(value.kS.value());
-  m->set_kg(value.kG.value());
-  m->set_kv(value.kV.value());
-  m->set_ka(value.kA.value());
+  m->set_ks(value.GetKs().value());
+  m->set_kg(value.GetKg().value());
+  m->set_kv(value.GetKv().value());
+  m->set_ka(value.GetKa().value());
 }
diff --git a/wpimath/src/main/native/cpp/controller/proto/ElevatorFeedforwardProto.cpp b/wpimath/src/main/native/cpp/controller/proto/ElevatorFeedforwardProto.cpp
index b72e9f2634..1eb8c3d0f7 100644
--- a/wpimath/src/main/native/cpp/controller/proto/ElevatorFeedforwardProto.cpp
+++ b/wpimath/src/main/native/cpp/controller/proto/ElevatorFeedforwardProto.cpp
@@ -27,8 +27,8 @@ frc::ElevatorFeedforward wpi::Protobuf<frc::ElevatorFeedforward>::Unpack(
 void wpi::Protobuf<frc::ElevatorFeedforward>::Pack(
     google::protobuf::Message* msg, const frc::ElevatorFeedforward& value) {
   auto m = static_cast<wpi::proto::ProtobufElevatorFeedforward*>(msg);
-  m->set_ks(value.kS());
-  m->set_kg(value.kG());
-  m->set_kv(value.kV());
-  m->set_ka(value.kA());
+  m->set_ks(value.GetKs().value());
+  m->set_kg(value.GetKg().value());
+  m->set_kv(value.GetKv().value());
+  m->set_ka(value.GetKa().value());
 }
diff --git a/wpimath/src/main/native/cpp/controller/struct/ArmFeedforwardStruct.cpp b/wpimath/src/main/native/cpp/controller/struct/ArmFeedforwardStruct.cpp
index 6b0070cb1e..92b5aefd90 100644
--- a/wpimath/src/main/native/cpp/controller/struct/ArmFeedforwardStruct.cpp
+++ b/wpimath/src/main/native/cpp/controller/struct/ArmFeedforwardStruct.cpp
@@ -26,8 +26,8 @@ frc::ArmFeedforward StructType::Unpack(std::span<const uint8_t> data) {
 
 void StructType::Pack(std::span<uint8_t> data,
                       const frc::ArmFeedforward& value) {
-  wpi::PackStruct<kKsOff>(data, value.kS());
-  wpi::PackStruct<kKgOff>(data, value.kG());
-  wpi::PackStruct<kKvOff>(data, value.kV());
-  wpi::PackStruct<kKaOff>(data, value.kA());
+  wpi::PackStruct<kKsOff>(data, value.GetKs().value());
+  wpi::PackStruct<kKgOff>(data, value.GetKg().value());
+  wpi::PackStruct<kKvOff>(data, value.GetKv().value());
+  wpi::PackStruct<kKaOff>(data, value.GetKa().value());
 }
diff --git a/wpimath/src/main/native/cpp/controller/struct/ElevatorFeedforwardStruct.cpp b/wpimath/src/main/native/cpp/controller/struct/ElevatorFeedforwardStruct.cpp
index ff28357bbb..82799f69c3 100644
--- a/wpimath/src/main/native/cpp/controller/struct/ElevatorFeedforwardStruct.cpp
+++ b/wpimath/src/main/native/cpp/controller/struct/ElevatorFeedforwardStruct.cpp
@@ -26,8 +26,8 @@ frc::ElevatorFeedforward StructType::Unpack(std::span<const uint8_t> data) {
 
 void StructType::Pack(std::span<uint8_t> data,
                       const frc::ElevatorFeedforward& value) {
-  wpi::PackStruct<kKsOff>(data, value.kS());
-  wpi::PackStruct<kKgOff>(data, value.kG());
-  wpi::PackStruct<kKvOff>(data, value.kV());
-  wpi::PackStruct<kKaOff>(data, value.kA());
+  wpi::PackStruct<kKsOff>(data, value.GetKs().value());
+  wpi::PackStruct<kKgOff>(data, value.GetKg().value());
+  wpi::PackStruct<kKvOff>(data, value.GetKv().value());
+  wpi::PackStruct<kKaOff>(data, value.GetKa().value());
 }
diff --git a/wpimath/src/main/native/include/frc/controller/ArmFeedforward.h b/wpimath/src/main/native/include/frc/controller/ArmFeedforward.h
index 28713003c9..2e986a9baa 100644
--- a/wpimath/src/main/native/include/frc/controller/ArmFeedforward.h
+++ b/wpimath/src/main/native/include/frc/controller/ArmFeedforward.h
@@ -192,17 +192,46 @@ class WPILIB_DLLEXPORT ArmFeedforward {
     return MaxAchievableAcceleration(-maxVoltage, angle, velocity);
   }
 
+  /**
+   * Returns the static gain.
+   *
+   * @return The static gain.
+   */
+  units::volt_t GetKs() const { return kS; }
+
+  /**
+   * Returns the gravity gain.
+   *
+   * @return The gravity gain.
+   */
+  units::volt_t GetKg() const { return kG; }
+
+  /**
+   * Returns the velocity gain.
+   *
+   * @return The velocity gain.
+   */
+  units::unit_t<kv_unit> GetKv() const { return kV; }
+
+  /**
+   * Returns the acceleration gain.
+   *
+   * @return The acceleration gain.
+   */
+  units::unit_t<ka_unit> GetKa() const { return kA; }
+
+ private:
   /// The static gain, in volts.
-  const units::volt_t kS;
+  units::volt_t kS;
 
   /// The gravity gain, in volts.
-  const units::volt_t kG;
+  units::volt_t kG;
 
-  /// The velocity gain, in volt seconds per radian.
-  const units::unit_t<kv_unit> kV;
+  /// The velocity gain, in V/(rad/s)volt seconds per radian.
+  units::unit_t<kv_unit> kV;
 
-  /// The acceleration gain, in volt seconds² per radian.
-  const units::unit_t<ka_unit> kA;
+  /// The acceleration gain, in V/(rad/s²).
+  units::unit_t<ka_unit> kA;
 };
 }  // namespace frc
 
diff --git a/wpimath/src/main/native/include/frc/controller/ElevatorFeedforward.h b/wpimath/src/main/native/include/frc/controller/ElevatorFeedforward.h
index 07a0499a53..d9edde7796 100644
--- a/wpimath/src/main/native/include/frc/controller/ElevatorFeedforward.h
+++ b/wpimath/src/main/native/include/frc/controller/ElevatorFeedforward.h
@@ -182,17 +182,46 @@ class ElevatorFeedforward {
     return MaxAchievableAcceleration(-maxVoltage, velocity);
   }
 
+  /**
+   * Returns the static gain.
+   *
+   * @return The static gain.
+   */
+  units::volt_t GetKs() const { return kS; }
+
+  /**
+   * Returns the gravity gain.
+   *
+   * @return The gravity gain.
+   */
+  units::volt_t GetKg() const { return kG; }
+
+  /**
+   * Returns the velocity gain.
+   *
+   * @return The velocity gain.
+   */
+  units::unit_t<kv_unit> GetKv() const { return kV; }
+
+  /**
+   * Returns the acceleration gain.
+   *
+   * @return The acceleration gain.
+   */
+  units::unit_t<ka_unit> GetKa() const { return kA; }
+
+ private:
   /// The static gain.
-  const units::volt_t kS;
+  units::volt_t kS;
 
   /// The gravity gain.
-  const units::volt_t kG;
+  units::volt_t kG;
 
   /// The velocity gain.
-  const units::unit_t<kv_unit> kV;
+  units::unit_t<kv_unit> kV;
 
   /// The acceleration gain.
-  const units::unit_t<ka_unit> kA;
+  units::unit_t<ka_unit> kA;
 };
 }  // namespace frc
 
diff --git a/wpimath/src/main/native/include/frc/controller/SimpleMotorFeedforward.h b/wpimath/src/main/native/include/frc/controller/SimpleMotorFeedforward.h
index 1ae1af3df3..b6ed239e78 100644
--- a/wpimath/src/main/native/include/frc/controller/SimpleMotorFeedforward.h
+++ b/wpimath/src/main/native/include/frc/controller/SimpleMotorFeedforward.h
@@ -245,16 +245,44 @@ class SimpleMotorFeedforward {
     return MaxAchievableAcceleration(-maxVoltage, velocity);
   }
 
-  /** The static gain. */
-  const units::volt_t kS;
+  /**
+   * Returns the static gain.
+   *
+   * @return The static gain.
+   */
+  units::volt_t GetKs() const { return kS; }
 
-  /** The velocity gain. */
-  const units::unit_t<kv_unit> kV;
+  /**
+   * Returns the velocity gain.
+   *
+   * @return The velocity gain.
+   */
+  units::unit_t<kv_unit> GetKv() const { return kV; }
 
-  /** The acceleration gain. */
-  const units::unit_t<ka_unit> kA;
+  /**
+   * Returns the acceleration gain.
+   *
+   * @return The acceleration gain.
+   */
+  units::unit_t<ka_unit> GetKa() const { return kA; }
+
+  /**
+   * Returns the period.
+   *
+   * @return The period.
+   */
+  units::second_t GetDt() const { return m_dt; }
 
  private:
+  /** The static gain. */
+  units::volt_t kS;
+
+  /** The velocity gain. */
+  units::unit_t<kv_unit> kV;
+
+  /** The acceleration gain. */
+  units::unit_t<ka_unit> kA;
+
   /** The period. */
   units::second_t m_dt;
 };
diff --git a/wpimath/src/test/java/edu/wpi/first/math/controller/proto/ArmFeedforwardProtoTest.java b/wpimath/src/test/java/edu/wpi/first/math/controller/proto/ArmFeedforwardProtoTest.java
index 5c036d5e5f..b3c151476f 100644
--- a/wpimath/src/test/java/edu/wpi/first/math/controller/proto/ArmFeedforwardProtoTest.java
+++ b/wpimath/src/test/java/edu/wpi/first/math/controller/proto/ArmFeedforwardProtoTest.java
@@ -19,9 +19,9 @@ class ArmFeedforwardProtoTest {
     ArmFeedforward.proto.pack(proto, DATA);
 
     ArmFeedforward data = ArmFeedforward.proto.unpack(proto);
-    assertEquals(DATA.ks, data.ks);
-    assertEquals(DATA.kg, data.kg);
-    assertEquals(DATA.kv, data.kv);
-    assertEquals(DATA.ka, data.ka);
+    assertEquals(DATA.getKs(), data.getKs());
+    assertEquals(DATA.getKg(), data.getKg());
+    assertEquals(DATA.getKv(), data.getKv());
+    assertEquals(DATA.getKa(), data.getKa());
   }
 }
diff --git a/wpimath/src/test/java/edu/wpi/first/math/controller/proto/ElevatorFeedforwardProtoTest.java b/wpimath/src/test/java/edu/wpi/first/math/controller/proto/ElevatorFeedforwardProtoTest.java
index e624afff74..fd2711935e 100644
--- a/wpimath/src/test/java/edu/wpi/first/math/controller/proto/ElevatorFeedforwardProtoTest.java
+++ b/wpimath/src/test/java/edu/wpi/first/math/controller/proto/ElevatorFeedforwardProtoTest.java
@@ -19,9 +19,9 @@ class ElevatorFeedforwardProtoTest {
     ElevatorFeedforward.proto.pack(proto, DATA);
 
     ElevatorFeedforward data = ElevatorFeedforward.proto.unpack(proto);
-    assertEquals(DATA.ks, data.ks);
-    assertEquals(DATA.kg, data.kg);
-    assertEquals(DATA.kv, data.kv);
-    assertEquals(DATA.ka, data.ka);
+    assertEquals(DATA.getKs(), data.getKs());
+    assertEquals(DATA.getKg(), data.getKg());
+    assertEquals(DATA.getKv(), data.getKv());
+    assertEquals(DATA.getKa(), data.getKa());
   }
 }
diff --git a/wpimath/src/test/java/edu/wpi/first/math/controller/struct/ArmFeedforwardStructTest.java b/wpimath/src/test/java/edu/wpi/first/math/controller/struct/ArmFeedforwardStructTest.java
index 42a452dbe7..256a78d241 100644
--- a/wpimath/src/test/java/edu/wpi/first/math/controller/struct/ArmFeedforwardStructTest.java
+++ b/wpimath/src/test/java/edu/wpi/first/math/controller/struct/ArmFeedforwardStructTest.java
@@ -22,9 +22,9 @@ class ArmFeedforwardStructTest {
     buffer.rewind();
 
     ArmFeedforward data = ArmFeedforward.struct.unpack(buffer);
-    assertEquals(DATA.ks, data.ks);
-    assertEquals(DATA.kg, data.kg);
-    assertEquals(DATA.kv, data.kv);
-    assertEquals(DATA.ka, data.ka);
+    assertEquals(DATA.getKs(), data.getKs());
+    assertEquals(DATA.getKg(), data.getKg());
+    assertEquals(DATA.getKv(), data.getKv());
+    assertEquals(DATA.getKa(), data.getKa());
   }
 }
diff --git a/wpimath/src/test/java/edu/wpi/first/math/controller/struct/ElevatorFeedforwardStructTest.java b/wpimath/src/test/java/edu/wpi/first/math/controller/struct/ElevatorFeedforwardStructTest.java
index a5a83520de..53de2d1daf 100644
--- a/wpimath/src/test/java/edu/wpi/first/math/controller/struct/ElevatorFeedforwardStructTest.java
+++ b/wpimath/src/test/java/edu/wpi/first/math/controller/struct/ElevatorFeedforwardStructTest.java
@@ -22,9 +22,9 @@ class ElevatorFeedforwardStructTest {
     buffer.rewind();
 
     ElevatorFeedforward data = ElevatorFeedforward.struct.unpack(buffer);
-    assertEquals(DATA.ks, data.ks);
-    assertEquals(DATA.kg, data.kg);
-    assertEquals(DATA.kv, data.kv);
-    assertEquals(DATA.ka, data.ka);
+    assertEquals(DATA.getKs(), data.getKs());
+    assertEquals(DATA.getKg(), data.getKg());
+    assertEquals(DATA.getKv(), data.getKv());
+    assertEquals(DATA.getKa(), data.getKa());
   }
 }
diff --git a/wpimath/src/test/native/cpp/controller/proto/ArmFeedforwardProtoTest.cpp b/wpimath/src/test/native/cpp/controller/proto/ArmFeedforwardProtoTest.cpp
index b0e57c78d2..4df8566db2 100644
--- a/wpimath/src/test/native/cpp/controller/proto/ArmFeedforwardProtoTest.cpp
+++ b/wpimath/src/test/native/cpp/controller/proto/ArmFeedforwardProtoTest.cpp
@@ -26,8 +26,8 @@ TEST(ArmFeedforwardProtoTest, Roundtrip) {
   ProtoType::Pack(proto, kExpectedData);
 
   ArmFeedforward unpacked_data = ProtoType::Unpack(*proto);
-  EXPECT_EQ(kExpectedData.kS.value(), unpacked_data.kS.value());
-  EXPECT_EQ(kExpectedData.kG.value(), unpacked_data.kG.value());
-  EXPECT_EQ(kExpectedData.kV.value(), unpacked_data.kV.value());
-  EXPECT_EQ(kExpectedData.kA.value(), unpacked_data.kA.value());
+  EXPECT_EQ(kExpectedData.GetKs().value(), unpacked_data.GetKs().value());
+  EXPECT_EQ(kExpectedData.GetKg().value(), unpacked_data.GetKg().value());
+  EXPECT_EQ(kExpectedData.GetKv().value(), unpacked_data.GetKv().value());
+  EXPECT_EQ(kExpectedData.GetKa().value(), unpacked_data.GetKa().value());
 }
diff --git a/wpimath/src/test/native/cpp/controller/proto/ElevatorFeedforwardProtoTest.cpp b/wpimath/src/test/native/cpp/controller/proto/ElevatorFeedforwardProtoTest.cpp
index 115a3dcf8b..5ec136f6aa 100644
--- a/wpimath/src/test/native/cpp/controller/proto/ElevatorFeedforwardProtoTest.cpp
+++ b/wpimath/src/test/native/cpp/controller/proto/ElevatorFeedforwardProtoTest.cpp
@@ -27,8 +27,8 @@ TEST(ElevatorFeedforwardProtoTest, Roundtrip) {
   ProtoType::Pack(proto, kExpectedData);
 
   ElevatorFeedforward unpacked_data = ProtoType::Unpack(*proto);
-  EXPECT_EQ(kExpectedData.kS.value(), unpacked_data.kS.value());
-  EXPECT_EQ(kExpectedData.kG.value(), unpacked_data.kG.value());
-  EXPECT_EQ(kExpectedData.kV.value(), unpacked_data.kV.value());
-  EXPECT_EQ(kExpectedData.kA.value(), unpacked_data.kA.value());
+  EXPECT_EQ(kExpectedData.GetKs().value(), unpacked_data.GetKs().value());
+  EXPECT_EQ(kExpectedData.GetKg().value(), unpacked_data.GetKg().value());
+  EXPECT_EQ(kExpectedData.GetKv().value(), unpacked_data.GetKv().value());
+  EXPECT_EQ(kExpectedData.GetKa().value(), unpacked_data.GetKa().value());
 }
diff --git a/wpimath/src/test/native/cpp/controller/struct/ArmFeedforwardStructTest.cpp b/wpimath/src/test/native/cpp/controller/struct/ArmFeedforwardStructTest.cpp
index a76f52585a..ee1c8d2435 100644
--- a/wpimath/src/test/native/cpp/controller/struct/ArmFeedforwardStructTest.cpp
+++ b/wpimath/src/test/native/cpp/controller/struct/ArmFeedforwardStructTest.cpp
@@ -26,8 +26,8 @@ TEST(ArmFeedforwardStructTest, Roundtrip) {
 
   ArmFeedforward unpacked_data = StructType::Unpack(buffer);
 
-  EXPECT_EQ(kExpectedData.kS.value(), unpacked_data.kS.value());
-  EXPECT_EQ(kExpectedData.kG.value(), unpacked_data.kG.value());
-  EXPECT_EQ(kExpectedData.kV.value(), unpacked_data.kV.value());
-  EXPECT_EQ(kExpectedData.kA.value(), unpacked_data.kA.value());
+  EXPECT_EQ(kExpectedData.GetKs().value(), unpacked_data.GetKs().value());
+  EXPECT_EQ(kExpectedData.GetKg().value(), unpacked_data.GetKg().value());
+  EXPECT_EQ(kExpectedData.GetKv().value(), unpacked_data.GetKv().value());
+  EXPECT_EQ(kExpectedData.GetKa().value(), unpacked_data.GetKa().value());
 }
diff --git a/wpimath/src/test/native/cpp/controller/struct/ElevatorFeedforwardStructTest.cpp b/wpimath/src/test/native/cpp/controller/struct/ElevatorFeedforwardStructTest.cpp
index 2e5c43a231..e554891ba2 100644
--- a/wpimath/src/test/native/cpp/controller/struct/ElevatorFeedforwardStructTest.cpp
+++ b/wpimath/src/test/native/cpp/controller/struct/ElevatorFeedforwardStructTest.cpp
@@ -27,8 +27,8 @@ TEST(ElevatorFeedforwardStructTest, Roundtrip) {
 
   ElevatorFeedforward unpacked_data = StructType::Unpack(buffer);
 
-  EXPECT_EQ(kExpectedData.kS.value(), unpacked_data.kS.value());
-  EXPECT_EQ(kExpectedData.kG.value(), unpacked_data.kG.value());
-  EXPECT_EQ(kExpectedData.kV.value(), unpacked_data.kV.value());
-  EXPECT_EQ(kExpectedData.kA.value(), unpacked_data.kA.value());
+  EXPECT_EQ(kExpectedData.GetKs().value(), unpacked_data.GetKs().value());
+  EXPECT_EQ(kExpectedData.GetKg().value(), unpacked_data.GetKg().value());
+  EXPECT_EQ(kExpectedData.GetKv().value(), unpacked_data.GetKv().value());
+  EXPECT_EQ(kExpectedData.GetKa().value(), unpacked_data.GetKa().value());
 }