Cycle speedway gearing

Ever wondered whether your slim tyre on 34/18 gearing is higher or lower than a big tyre on 33/18? Wonder no more …

Calculator …

Front gear (teeth): Rear gear (teeth):
Rear tyre diameter (mm) : Tyre name :

Gearing Ratio Tyre Diameter Gear inches Relative to std
33 / 18 1.83 Maxxis Larsen 1.9″ 26″ 660mm / 26.0″ 47.6″ 1.00

Relative to each other …

The speedway “standard” is a Maxxis Larsen or Schwalbe Speedway Pro on 33*18 gearing – almost exactly the same, so we’ll call that 1.0. The other gearing / tyre diameter values are relative to that 1.0.

The number beside each tyre is the diameter of an inflated tyre on a rim.

Gearing
Ratio
Maxxis Ignitor 1.95″ (665mm)
Schwalbe Speedway Pro (660mm)
Maxxis Larsen 1.9″ (660mm)
Schwalbe Black Jack (655mm)
Kenda Small Block Eight (652mm)
Schwalbe CX Pro (635mm)
24″ wheel 1.75″ tyre (609mm)
32:19 1.68 0.93 0.92 0.92 0.91 0.91 0.88 0.85
33:19 1.74 0.95 0.95 0.95 0.94 0.94 0.91 0.87
32:18 1.78 0.98 0.97 0.97 0.96 0.96 0.93 0.89
34:19 1.79 0.98 0.98 0.98 0.97 0.96 0.94 0.90
33:18 1.83 1.01 1.00 1.00 0.99 0.99 0.96 0.92
32:17 1.88 1.03 1.03 1.03 1.02 1.01 0.99 0.95
34:18 1.89 1.04 1.03 1.03 1.02 1.02 0.99 0.95
36:19 1.89 1.04 1.03 1.03 1.03 1.02 0.99 0.95
33:17 1.94 1.07 1.06 1.06 1.05 1.05 1.02 0.98
34:17 2.00 1.10 1.09 1.09 1.08 1.08 1.05 1.01
36:18 2.00 1.10 1.09 1.09 1.08 1.08 1.05 1.01
36:17 2.12 1.16 1.16 1.16 1.15 1.14 1.11 1.07
36:16 2.25 1.24 1.23 1.23 1.22 1.21 1.18 1.13
44:24 1.83 1.01 1.00 1.00 0.99 0.99 0.96 0.92
43:24 1.79 0.98 0.98 0.98 0.97 0.97 0.94 0.90
42:24 1.75 0.96 0.95 0.95 0.95 0.94 0.92 0.88