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Speedo Drive Ratios

 

Please NOTE that these ratio's are theoretical ONLY and they may not even exist in real life. This is only meant to give you an idea of the ratio you should be looking for and should NOT be used on the road unless checked against a calibrated Speedometer.

The first thing you need to do is chose the correct wheel/tyre combination you are going to be using. (or the closest to it).

165/70/10 (145/10)

145/12

155/12

175/50/13

If the size you need is NOT listed above then try to choose the nearest one. If you could also let me know the circumferance of the tyre and it's size then I will be able to add it to these pages. Mail any inprovements you wish to see or corrections of the existing text please to GCRC63@mailbox.sci.rl.ac.uk


165/70/10 (145/10)

look up your Diff ratio up in the column on the left hand side, then move right until the number in the table corresponds to the actual turns per mile of your speedo. (often printed on the face or on a sticker on the back). Then follow the table up until you get to the top, this will be the drive gears that you need to use (if available).

Spedo Drive Ratio -->

------------------------

Diff Ratio--v

5/18

3.6:1

5/17

3.4:1

5/16

3.2:1

6/18

3:1

6/17

2.83:1

6/16

2.67:1

7/18

2.52:1

7/17

2.43:1

MPH per 1000 RPM

4 Speed 1:1 Drop gears

MPH per 1000 RPM

5 Speed Jack Knight

2.95

867

919.8

976

1041

1104

1170

1216

1286

19.21

22.52

3.05

897

950

1009

1077

1141

1210

1256

1330

18.58

21.78

3.105

913

967

1027

1096

1161

1231

1280

1353

18.25

21.4

3.21

944

999

1062

1133

1201

1273

1322

1399

17.65

20.69

3.44

1011

1071

1138

1214

1287

1364

1417

1499

16.47

19.31

3.65

1073

1136

1208

1288

1365

1447

1504

1590

15.52

18.19

3.76

1106

1171

1244

1327

1407

1491

1549

1639

15.07

17.67


145/12

look up your Diff ratio up in the column on the left hand side, then move right until the number in the table corresponds to the actual turns per mile of your speedo. (often printed on the face or on a sticker on the back). Then follow the table up until you get to the top, this will be the drive gears that you need to use (if available).

Spedo Drive Ratio -->

------------------------

Diff Ratio--v

5/18

3.6:1

5/17

3.4:1

5/16

3.2:1

6/18

3:1

6/17

2.83:1

6/16

2.67:1

7/18

2.52:1

7/17

2.43:1

MPH per 1000 RPM

4 Speed 1:1 Drop gears

MPH per 1000 RPM

5 Speed Jack Knight

2.95

850

900

957

1020

1081

1147

1191

1260

19.6

22.98

3.05

897

931

989

1055

1118

1186

1232

1303

18.95

22.22

3.105

895

947

1007

1074

1139

1207

1254

1326

18.62

21.83

3.21

925

980

1041

1110

1177

1248

1296

1371

18.01

21.11

3.44

991

1050

1115

1190

1261

1337

1389

1469

16.81

19.71

3.65

1052

1114

1183

1262

1338

1418

1474

1559

15.84

18.57

3.76

1084

1148

1219

1301

1379

1461

1518

1606

15.37

18.02


155/12

look up your Diff ratio up in the column on the left hand side, then move right until the number in the table corresponds to the actual turns per mile of your speedo. (often printed on the face or on a sticker on the back). Then follow the table up until you get to the top, this will be the drive gears that you need to use (if available).

Spedo Drive Ratio -->

------------------------

Diff Ratio--v

5/18

3.6:1

5/17

3.4:1

5/16

3.2:1

6/18

3:1

6/17

2.83:1

6/16

2.67:1

7/18

2.52:1

7/17

2.43:1

MPH per 1000 RPM

4 Speed 1:1 Drop gears

MPH per 1000 RPM

5 Speed Jack Knight

2.95

803

850

903

963

1021

1082

1125

1190

20.75

24.33

3.05

830

879

934

996

1056

1119

1163

1230

20.07

23.53

3.105

845

894

950

1014

1075

1139

1183

1252

19.72

23.12

3.21

873

925

982

1048

1111

1178

1224

1294

19.08

22.37

3.44

936

991

1053

1123

1191

1262

1311

1387

17.8

20.87

3.65

993

1052

1117

1192

1264

1340

1392

1472

16.77

19.66

3.76

1023

1084

1151

1228

1302

1380

1434

1516

16.28

19.09


175/50/13

look up your Diff ratio up in the column on the left hand side, then move right until the number in the table corresponds to the actual turns per mile of your speedo. (often printed on the face or on a sticker on the back). Then follow the table up until you get to the top, this will be the drive gears that you need to use (if available).

Spedo Drive Ratio -->

------------------------

Diff Ratio--v

5/18

3.6:1

5/17

3.4:1

5/16

3.2:1

6/18

3:1

6/17

2.83:1

6/16

2.67:1

7/18

2.52:1

7/17

2.43:1

MPH per 1000 RPM

4 Speed 1:1 Drop gears

MPH per 1000 RPM

5 Speed Jack Knight

2.95

786

833

885

944

1000

1060

1101

1165

21.19

24.84

3.05

813

861

915

976

1034

1096

1139

1205

20.49

24.02

3.105

827

876

931

993

1053

1116

1159

1226

20.13

23.6

3.21

855

906

963

1027

1088

1154

1199

1268

19.47

22.83

3.44

917

971

1032

1100

1166

1237

1285

1359

18.17

21.3

3.65

973

1030

1095

1168

1238

1312

1363

1442

17.12

20.07

3.76

1002

1061

1128

1203

1275

1351

1404

1485

16.63

19.5


If you encounter any problems or just want a chat about anything just mail - gcrc63@mailbox.sci.rl.ac.uk

  

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