FastCounter by bCentral

1.

Find your tire sidewall width or size in Column 1.

2.

Move right (Columns 3-11) to get your Aspect Ratio (A/R); may be on the sidewall

or manufacturer's specs; most old-style tall tires are 100 A/R (Goodyear "Super

Eagle", Arco, Dunlop "Safety Mileage Mk. II" & "Speedmaster Mk. II", etc.).

3.

Add the figure in the box to your rim size - this is your tire diameter.

Column 1

Tire size in millimeters

Column 2

Tread width in inches (millimeters * .0393701)

Columns 3 - 11

Sidewall height (from rim bead seat to top of tread)

Size

Width

55 A/R

60 A/R

65 A/R

70 A/R

75 A/R

80 A/R

85 A/R

90 A/R

100 A/R

  80mm

3.15"

3.46"

3.77"

4.08"

4.39"

4.70"

5.01"

5.32"

5.63"

6.26"

  90

3.54

3.90

4.25

4.60

4.95

5.30

5.65

6.00

6.35

7.06

100

3.94

4.33

4.72

5.11

5.50

5.89

6.28

6.67

7.06

7.84

110

4.33

4.76

5.19

5.62

6.05

6.48

6.91

7.34

7.77

8.63

120

4.72

5.20

5.67

6.14

6.61

7.08

7.55

8.02

8.49

9.43

130

5.12

5.63

6.14

6.65

7.16

7.67

8.18

8.69

9.20

10.22

140

5.51

6.06

6.61

7.16

7.71

8.26

8.81

9.36

9.91

11.01

150

5.91

6.50

7.09

7.68

8.27

8.86

9.45

10.04

10.63

11.81

160

6.30

6.93

7.56

8.19

8.82

9.45

10.08

10.71

11.34

12.60

170

6.69

7.36

8.03

8.70

9.37

10.04

10.71

11.38

12.05

13.39

180

7.09

7.80

8.51

9.22

9.93

10.64

11.35

12.06

12.77

14.19

190

7.48

8.23

8.98

9.73

10.48

11.23

11.98

12.73

13.48

14.98

200

7.87

8.66

9.45

10.24

11.03

11.82

12.61

13.40

14.19

15.77

Size

Width

55 A/R

60 A/R

65 A/R

70 A/R

75 A/R

80 A/R

85 A/R

90 A/R

100 A/R

"Harley-Davidson" name for reference purposes only. Not affiliated with Harley-Davidson Motor Co.

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