Southern Wisconsin's premier BMX racing facility for over 20 years
Track located at the Walworth County Fairgrounds - 411 E. Court Street Elkhorn, WI.
For information, and for Race Day Track, call:
(262) 623-8955
Weekdays between 10am and 4pm

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Gearing Charts & Rider Sizes

Rider Height

Frame Size

Top Tube Length

Stem Length

Bar Rise

Bar Width

4'0" & Under

Micro-Mini

15"-15.5"

Mini

2"-2.5"

20"-21.5"

4'4"-4'10"

Mini

15.5"-16.5"

Mini-Mini XL

2"-3.5"

21"-23"

4'4"-4'10"

Junior

16"-17.5"

Mini-Mini XL

3"-4.5"

22"-24.5"

4'8"-5'4"

Expert

17"-18.5"

Pro

4.5"-6"

24"-26"

5'2"-5'10"

Expert XL

18"-19"

Pro

6"-7.5"

26"-27"

5'6"-5'10"

Pro

18.5"-19.5"

Pro-Pro XL

7"-8"

27"-28"

5'10"-6'1"

Pro XXL

19"-21"

Pro-Pro XL

7"-8"

27"-28"

6' & Over

Pro XXL

20.5" & Over

Pro XL-Pro XXL

7"-8"

28"+


Cranks

Riders Inseam

20"

21"

22"

23"

24"

25"

26"

Crank Length

140mm

145mm

150mm

155mm

160mm

162mm

166mm

Riders Inseam

27"

28"

29"

30"

31"

32"

34"

Crank Length

171mm

175mm

177mm

180mm

182mm

185mm

190mm


20" X 1.75" GEAR CHART

Chain wheels

34

35

36

37

38

39

40

41

42

43

44

45

46

Freewheel 14

47.4

48.7

50.2

51.6

53.0

54.4

55.7

57.1

58.5

59.9

61.9

62.7

64.1

Freewheel 15

44.3

45.4

46.0

48.1

49.4

50.7

52.0

53.3

54.6

55.9

57.2

58.5

59.8

Freewheel 16

41.5

42.7

43.6

45.1

46.3

47.5

48.8

50.0

51.2

52.4

53.7

54.9

56.1

Freewheel 17

39.0

40.2

41.3

42.5

43.6

44.7

45.9

47.0

48.2

49.4

50.5

51.7

52.8

Freewheel 18

36.8

37.8

39.0

40.1

41.2

42.3

43.3

44.4

45.5

46.6

47.7

48.8

49.9


20" X 1.50" GEAR CHART

Chain wheels

34

35

36

37

38

39

40

41

42

43

44

45

46

Freewheel 14

46.8

48.1

49.5

50.9

52.3

53.6

55.0

56.4

57.5

59.1

60.5

61.8

63.2

Freewheel 15

43.6

44.9

46.2

47.4

48.8

50.1

51.3

52.8

53.9

55.2

56.5

57.7

59.1

Freewheel 16

40.9

42.1

43.3

44.5

45.7

46.9

48.1

49.3

50.5

51.7

52.9

54.1

55.3

Freewheel 17

38.5

39.6

40.8

41.9

43.1

44.1

45.2

46.4

47.5

48.7

49.8

51.0

52.2

Freewheel 18

36.4

37.4

38.5

39.6

40.6

41.7

42.8

43.9

44.9

46.0

47.0

48.1

49.2


20" x 1 3/8" GEAR CHART

Chain wheels

34

35

36

37

38

39

40

41

42

43

44

45

46

Freewheel 14

51.0

52.5

54.0

55.5

57.0

58.5

60.0

61.5

63.0

64.5

66.0

67.5

69.0

Freewheel 15

47.6

49.0

50.4

51.6

53.2

54.6

56.0

57.4

58.8

60.2

61.6

63.0

64.4

Freewheel 16

44.6

45.9

47.3

48.6

49.9

51.2

52.5

53.9

55.2

56.5

57.8

59.1

60.4

Freewheel 17

42.0

43.2

44.5

45.7

47.0

48.2

49.4

50.7

51.9

53.2

54.4

55.6

56.9

Freewheel 18

39.7

40.7

42.0

43.2

44.4

45.5

46.7

47.9

49.0

50.2

51.4

52.5

53.7


20" X 1 1/8" GEAR CHART

Chain wheels

34

35

36

37

38

39

40

41

42

43

44

45

46

Freewheel 14

48.6

50.0

51.4

52.8

54.3

55.7

57.1

58.6

60.0

61.4

62.8

64.3

65.7

Freewheel 15

45.3

46.7

48.0

49.3

50.7

52.0

53.3

54.7

56.0

57.3

58.7

60.0

61.3

Freewheel 16

42.5

43.8

45.0

46.2

47.5

48.7

50.0

51.2

52.5

53.7

55.0

56.2

57.5

Freewheel 17

40.0

41.2

42.3

43.5

44.7

45.9

47.0

48.2

49.4

50.6

51.8

52.9

54.1

Freewheel 18

37.7

38.8

40.0

41.1

42.2

43.3

44.4

45.6

46.7

47.8

48.9

50.0

51.1


24" X 1.75" GEAR CHART

Chain wheels

34

35

36

37

38

39

40

41

42

43

44

45

46

Freewheel 14

58.3

60.0

61.7

63.3

65.0

66.9

68.6

70.3

72.0

73.7

75.3

77.0

78.9

Freewheel 15

54.4

56.0

57.6

59.3

60.7

62.4

64.1

65.5

67.2

68.9

70.3

72.0

73.7

Freewheel 16

51.0

52.5

54.0

55.5

57.0

58.5

60.0

61.4

63.1

64.5

66.0

67.4

69.1

Freewheel 17

48.0

49.4

50.0

52.2

53.6

55.1

56.5

57.9

59.3

60.7

62.1

63.6

65.0

Freewheel 18

45.3

46.5

48.0

49.4

50.7

52.0

53.3

54.7

56.0

57.3

58.5

60.0

61.4


24" X 1.50" GEAR CHART

Chain wheels

34

35

36

37

38

39

40

41

42

43

44

45

46

Freewheel 14

55.9

57.5

59.1

60.7

62.3

64.2

65.8

67.4

69.0

70.6

72.2

73.8

75.7

Freewheel 15

52.1

53.7

55.2

56.7

58.2

59.8

61.3

62.8

64.4

65.9

67.4

69.0

70.6

Freewheel 16

48.4

50.3

51.8

53.2

54.6

56.0

57.5

58.9

60.3

61.8

63.2

64.6

66.2

Freewheel 17

46.0

47.3

48.7

50.0

51.4

52.8

54.1

55.5

56.8

58.8

59.5

60.8

62.3

Freewheel 18

43.4

44.7

46.0

47.2

48.5

49.8

51.1

52.4

53.7

54.9

56.2

57.5

58.9


24" X 1 3/8" GEAR CHART

Chain wheels

34

35

36

37

38

39

40

41

42

43

44

45

46

Freewheel 14

58.3

60.0

61.7

63.3

65.0

66.9

68.6

70.3

72.0

73.7

75.3

77.0

78.9

Freewheel 15

54.4

56.0

57.6

59.3

60.7

62.4

64.1

65.5

67.2

68.9

71.3

72.0

73.7

Freewheel 16

51.1

52.5

54.0

55.5

57.0

58.5

60.0

61.4

63.1

64.5

66.0

67.4

69.1

Freewheel 17

48.0

49.4

50.8

52.2

53.6

55.1

56.5

57.9

59.3

60.7

62.1

63.3

65.0

Freewheel 18

45.3

46.5

48.0

49.4

50.7

52.0

53.3

54.7

56.0

57.3

58.5

60.0

61.4


24" X 1 1/8" GEAR CHART

Chain wheels

34

35

36

37

38

39

40

41

42

43

44

45

46

Freewheel 14

54.9

56.5

58.1

59.7

61.3

63.1

64.7

66.3

67.9

69.4

71.0

72.6

74.4

Freewheel 15

51.3

52.8

54.3

55.8

57.3

58.8

60.3

61.8

63.3

64.9

66.3

67.9

69.4

Freewheel 16

48.1

49.5

50.9

52.3

53.7

55.1

56.6

57.9

59.5

60.8

62.2

63.9

65.1

Freewheel 17

45.2

46.6

47.9

49.3

50.6

51.9

53.2

54.6

55.9

57.2

58.6

59.9

61.3

Freewheel 18

42.7

43.9

45.2

46.6

47.7

49.1

50.3

51.5

52.8

54.0

55.3

56.6

57.9


Walworth County BMX is a USA BMX Sanctioned Racing Facility
All Rights Reserved © 2013



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