Modified Stock Gearing - Boston Gear

Chain Length in Pitches =
TO DETERMINE CHAIN LENGTH IN PITCHES
(Approximately):
Roller Chain Drives
(
2 x CD (inches)) +
(
Teeth in Driver & Driven
)
+ Constant
Pitch 2
{ }
Add for Ratio up to 4 : 1=12
Constant 4 to 6: 1=4
6 to 8: 1=6
Selection
Pitch Conversion Chart
This chart gives chain length in feet when number of pitches and chain pitch (in inches) is known
No. Chain Pitch — Inches
of 1/4 3/8 1/2 5/8 3/4 1 1-1/4 1-1/2 1-3/4 2 2-1/4 2-1/2
Pitches Chain Length — Feet
1 0.02 0.03 0.04 0.05 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20
2 0.04 0.06 0.08 0.10 0.12 0.16 0.20 0.25 0.29 0.33 0.37 0.41
3 0.06 0.09 0.12 0.15 0.18 0.25 0.31 0.37 0.43 0.50 0.56 0.62
4 0.08 0.12 0.16 0.20 0.25 0.33 0.41 0.50 0.58 0.66 0.75 0.83
5 0.10 0.15 0.20 0.26 0.31 0.41 0.52 0.62 0.72 0.83 0.93 1.04
6 0.12 0.18 0.25 0.31 0.37 0.50 0.62 0.75 0.87 1.00 1.12 1.25
7 0.14 0.21 0.29 0.36 0.43 0.58 0.72 0.87 1.02 1.16 1.31 1.45
8 0.16 0.25 0.33 0.41 0.50 0.66 0.83 1.00 1.16 1.33 1.50 1.66
9 0.18 0.28 0.37 0.46 0.56 0.75 0.93 1.12 1.31 1.50 1.68 1.87
10 0.20 0.31 0.41 0.52 0.62 0.83 1.04 1.25 1.45 1.66 1.87 2.08
11 0.22 0.34 0.45 0.57 0.68 0.91 1.14 1.37 1.60 1.83 2.06 2.29
12 0.25 0.37 0.50 0.62 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50
13 0.27 0.40 0.54 0.67 0.81 1.08 1.35 1.62 1.89 2.16 2.43 2.70
14 0.29 0.43 0.58 0.72 0.87 1.16 1.45 1.75 2.04 2.33 2.62 2.91
15 0.31 0.46 0.62 0.78 0.93 1.25 1.56 1.87 2.18 2.50 2.81 3.12
16 0.33 0.50 0.66 0.83 1.00 1.33 1.66 2.00 2.33 2.66 3.00 3.33
17 0.35 0.53 0.70 0.88 1.06 1.41 1.77 2.12 2.47 2.83 3.18 3.54
18 0.37 0.56 0.75 0.93 1.12 1.50 1.87 2.25 2.62 3.00 3.37 3.75
19 0.39 0.59 0.79 0.98 1.18 1.58 1.97 2.37 2.77 3.16 3.56 3.95
20 0.41 0.62 0.83 1.04 1.25 1.66 2.08 2.50 2.91 3.33 3.75 4.16
22 0.45 0.68 0.91 1.14 1.37 1.83 2.29 2.75 3.20 3.66 4.12 4.58
24 0.50 0.75 1.00 1.25 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00
28 0.58 0.87 1.16 1.45 1.75 2.33 2.91 3.50 4.08 4.56 5.25 5.83
30 0.62 0.93 1.25 1.56 1.87 2.50 3.12 3.75 4.37 5.00 5.62 6.25
34 0.70 1.06 1.41 1.77 2.12 2.83 3.54 4.25 4.95 5.66 6.37 7.08
38 0.79 1.18 1.58 1.97 2.37 3.16 3.95 4.75 5.54 6.33 7.12 7.91
40 0.83 1.25 1.66 2.08 2.50 3.33 4.16 5.00 5.83 6.66 7.50 8.33
44 0.91 1.37 1.83 2.29 2.75 3.66 4.58 5.50 6.41 7.33 8.25 9.16
48 1.00 1.50 2.00 2.50 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00
50 1.04 1.56 2.08 2.60 3.12 4.16 5.20 6.25 7.29 8.33 9.37 10.41
54 1.12 1.68 2.25 2.81 3.37 4.50 5.62 6.75 7.87 9.00 10.12 11.25
58 1.20 1.81 2.41 3.02 3.62 4.83 6.04 7.25 8.45 9.66 10.87 12.08
60 1.25 1.87 2.50 3.12 3.75 5.00 6.25 7.50 8.75 10.00 11.25 12.50
65 1.35 2.03 2.70 3.38 4.06 5.41 6.77 8.12 9.47 10.83 12.18 13.54
70 1.45 2.18 2.91 3.64 4.37 5.83 7.29 8.75 10.20 11.66 13.12 14.58
75 1.56 2.34 3.12 3.90 4.68 6.25 7.81 9.37 10.93 12.50 14.06 15.62
80 1.66 2.50 3.33 4.16 5.00 6.66 8.33 10.00 11.66 13.33 15.00 16.66
85 1.77 2.65 3.54 4.42 5.31 7.08 8.85 10.62 12.39 14.16 15.93 17.70
90 1.87 2.81 3.75 4.68 5.62 7.50 9.37 11.25 13.12 15.00 16.87 18.75
95 1.97 2.96 3.95 4.94 5.93 7.91 9.89 11.87 13.85 15.83 17.81 19.79
100 2.08 3.12 4.16 5.20 6.25 8.33 10.41 12.50 14.58 16.66 18.75 20.83
H
P-1930-BG 04/10 Boston Gear 800-825-6544 265