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Technical reference page: 29

RDS Instruments - Wheel sensor calibration factors

NB All wheel figures are approximate and should be double checked using the procedure in the appropriate RDS instruction manual.

For an unlisted tyre size multiply the loaded rolling radius or the rolling circumference of the tyre by the appropriate conversion factor at the bottom of the chart.
EG For a tyre with a rolling radius of 520mm on a 5D multiply 0.520 x 2.04 = 1.06

Tyre size

Rolling
Radius
metres

Rolling
circ
metres

475/5D/St/Ph
Deltas/ICM
Shaft sensor
FPW axle

Ph/St TDI
Deltas/ICM
Shaft sensor
Melo axle

 3D/4D
Deltas/ICM
Shaft sensor

2D/3D/4D
SAM 20
Shaft sensor

2D
SAM 20
Wheel magnets

31x15.5x15 STG LP

0.360

2.262

 

 

0.96

3.1

7.4

12.4x16 Intermediate

0.443

2.784

0.91

 

1.18

3.9

9.1

6.00x36 row crop

0.577

3.626

 

 

1.54

5.1

11.9

7.2x36 row crop

0.592

3.72

1.21

 

1.58

5.2

12.2

38x20x16 LP

0.436

2.74

0.89

 

1.16

3.8

9.0

38x14x20 LP

0.436

2.74

0.89

 

1.16

3.8

9.0

7.2x40 row crop

0.662

4.16

1.35

 

 

 

 

9.5x36 row crop

0.662

4.16

1.35

 

 

 

 

9.5x24 Intermediate

0.520

3.27

1.06

 

1.39

4.6

10.7

8.3x36 row crop

0.627

3.94

1.28

 

 

 

 

500/60-22.5 LP

0.505

3.17

1.03

 

 

 

 

600/50-22.5 LP

0.505

3.17

1.03

 

 

 

 

550/45-22.5

0.475

2.98

0.97

 

 

 

 

440/65-R24

0.525

3.30

1.07

 

 

 

 

480/65-R24

0.552

3.47

1.13

 

 

 

 

9.5x40 RC

0.683

4.29

1.40

 0.71

 

 

 

8.3x44 RC

0.724

4.55

1.48

 

 

 

 

  Radius conversion factor

2.04

 1.05

2.67

8.8

20.6