Cycle speedway gearing

Ever wondered whether your 1.75″ MTB tyre on 34:18 gearing is higher or lower than 33:18 on a Speedway Pro? Wonder no more …

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

The number below 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