diff --git a/ssl/test/runner/common.go b/ssl/test/runner/common.go
index bad3ebe..fb78ef1 100644
--- a/ssl/test/runner/common.go
+++ b/ssl/test/runner/common.go
@@ -621,10 +621,6 @@
 	// across a renego.
 	RequireSameRenegoClientVersion bool
 
-	// RequireFastradioPadding, if true, requires that ClientHello messages
-	// be at least 1000 bytes long.
-	RequireFastradioPadding bool
-
 	// ExpectInitialRecordVersion, if non-zero, is the expected
 	// version of the records before the version is determined.
 	ExpectInitialRecordVersion uint16
@@ -736,6 +732,10 @@
 	// ExpectNewTicket, if true, causes the client to abort if it does not
 	// receive a new ticket.
 	ExpectNewTicket bool
+
+	// RequireClientHelloSize, if not zero, is the required length in bytes
+	// of the ClientHello /record/. This is checked by the server.
+	RequireClientHelloSize int
 }
 
 func (c *Config) serverInit() {
diff --git a/ssl/test/runner/handshake_server.go b/ssl/test/runner/handshake_server.go
index 3902ed3..5d37674 100644
--- a/ssl/test/runner/handshake_server.go
+++ b/ssl/test/runner/handshake_server.go
@@ -139,8 +139,8 @@
 		c.sendAlert(alertUnexpectedMessage)
 		return false, unexpectedMessageError(hs.clientHello, msg)
 	}
-	if config.Bugs.RequireFastradioPadding && len(hs.clientHello.raw) < 1000 {
-		return false, errors.New("tls: ClientHello record size should be larger than 1000 bytes when padding enabled.")
+	if size := config.Bugs.RequireClientHelloSize; size != 0 && len(hs.clientHello.raw) != size {
+		return false, fmt.Errorf("tls: ClientHello record size is %d, but expected %d", len(hs.clientHello.raw), size)
 	}
 
 	if c.isDTLS && !config.Bugs.SkipHelloVerifyRequest {
diff --git a/ssl/test/runner/runner.go b/ssl/test/runner/runner.go
index d4804bf..ff10c05 100644
--- a/ssl/test/runner/runner.go
+++ b/ssl/test/runner/runner.go
@@ -2997,6 +2997,19 @@
 			base64.StdEncoding.EncodeToString(testSCTList),
 		},
 	})
+	testCases = append(testCases, testCase{
+		testType: clientTest,
+		name:     "ClientHelloPadding",
+		config: Config{
+			Bugs: ProtocolBugs{
+				RequireClientHelloSize: 512,
+			},
+		},
+		// This hostname just needs to be long enough to push the
+		// ClientHello into F5's danger zone between 256 and 511 bytes
+		// long.
+		flags: []string{"-host-name", "01234567890123456789012345678901234567890123456789012345678901234567890123456789.com"},
+	})
 }
 
 func addResumptionVersionTests() {
@@ -3263,29 +3276,6 @@
 	})
 }
 
-func addFastRadioPaddingTests() {
-	testCases = append(testCases, testCase{
-		protocol: tls,
-		name:     "FastRadio-Padding",
-		config: Config{
-			Bugs: ProtocolBugs{
-				RequireFastradioPadding: true,
-			},
-		},
-		flags: []string{"-fastradio-padding"},
-	})
-	testCases = append(testCases, testCase{
-		protocol: dtls,
-		name:     "FastRadio-Padding-DTLS",
-		config: Config{
-			Bugs: ProtocolBugs{
-				RequireFastradioPadding: true,
-			},
-		},
-		flags: []string{"-fastradio-padding"},
-	})
-}
-
 var testHashes = []struct {
 	name string
 	id   uint8
@@ -3730,7 +3720,6 @@
 	addRenegotiationTests()
 	addDTLSReplayTests()
 	addSigningHashTests()
-	addFastRadioPaddingTests()
 	addDTLSRetransmitTests()
 	addExportKeyingMaterialTests()
 	addTLSUniqueTests()