Gear inches / gain ratio for 26 inch diameter wheel • 6.875 inch crank arm length
  30 26 23 20 17 15 12
24 20.80 / 1.51 24.00 / 1.75 27.13 / 1.97 31.20 / 2.27 36.71 / 2.67 41.60 / 3.03 52.00 / 3.78
38 32.93 / 2.40 38.00 / 2.76 42.96 / 3.12 49.40 / 3.59 58.12 / 4.23 65.87 / 4.79 82.33 / 5.99
48 41.60 / 3.03 48.00 / 3.49 54.26 / 3.95 62.40 / 4.54 73.41 / 5.34 83.20 / 6.05 104.00 / 7.56