Repairing Jaeger and Smiths Speedometers

An Article by Anthony Rhodes Copyright 2000

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Page 17

APPENDIX III

WORM GEAR * ODOMETER GEAR = CALIBRATION

Worm	Odometer	Calibration		Worm	Odometer	Calibration
20	50	1000		25	38	950
20	51	1020		25	39	975
20	52	1040		25	40	1000
20	53	1060		25	41	1025
20	54	1080		25	42	1050
20	55	1100		25	43	1075
20	56	1120		25	44	1100
20	57	1140		25	45	1125
20	58	1160		25	46	1150
20	59	1180		25	47	1175
20	60	1200		25	48	1200
20	61	1220		25	49	1225
20	62	1240		25	50	1250
20	63	1260		25	51	1275
20	64	1280		25	52	1300
20	65	1300		25	53	1325
20	66	1320		25	54	1350
20	67	1340		25	55	1375
20	68	1360		25	56	1400
20	69	1380		25	57	1425
20	70	1400		25	58	1450

Table (continued)

Worm	Odometer	Calibration
32	27	864
32	28	896
32	29	928
32	30	960
32	31	992
32	32	1024
32	33	1055
32	34	1088
32	35	1120
32	36	1152
32	37	1194
32	38	1216
32	39	1248
32	40	1280
32	41	1312
32	42	1344
32	43	1376
32	44	1408
32	45	1440
32	46	1472
32	47	1504

If your odometer reads too MANY miles: You need MORE teeth on the odometer gear.
If your odometer reads too FEW miles: You need FEWER teeth on the odometer gear.

New Odometer Gear = your odometer gear * your odometer reading / correct odometer reading
NOTE: you will need to round the answer to the closest whole number.

Tony Rhodes

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