Example Table. Gear ratios for an 18-speed bicycle Gear Ratio Gear (F) Back Gear (B) Tire Revolutions (F/B) B1 (smallest gear) = 14 2 B2 = 16 1.8 F1 (smallest B3 = 18 1.6 gear) B4 = 21 1.3 28 B5 = 24 1.2 B6 (largest gear) = 28 1 B1 (smallest gear) = 14 2.7 B2 = 16 2.4 F2 (middle B3 = 18 2.1 gear) B4 = 21 1.8 38 B5 = 24 1.6 B6 (largest gear) = 28 1.4 B1 (smallest gear) = 14 3.4 B2 = 16 3 F3 (largest B3 = 18 2.7 gear) B4 = 21 2.3 48 B5 = 24 2 B6 (largest gear) = 28 1.7
Example Table. Gear ratios for an 18-speed bicycle Gear (F) Back Gear (B) Gear Ratio (F/B) Tire Revolutions F1 (smallest gear) 28 B1 (smallest gear) = 14 2 B2 = 16 1.8 B3 = 18 1.6 B4 = 21 1.3 B5 = 24 1.2 B6 (largest gear) = 28 1 F2 (middle gear) 38 B1 (smallest gear) = 14 2.7 B2 = 16 2.4 B3 = 18 2.1 B4 = 21 1.8 B5 = 24 1.6 B6 (largest gear) = 28 1.4 F3 (largest gear) 48 B1 (smallest gear) = 14 3.4 B2 = 16 3 B3 = 18 2.7 B4 = 21 2.3 B5 = 24 2 B6 (largest gear) = 28 1.7