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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): [tyreField type=”number” name=”front” id=”front” value=”33″] Rear gear (teeth): [tyreField type=”number” name=”rear” id=”rear” value=”18″]
Rear tyre diameter (mm) : [tyreField input id=”tyre” name=”tyre” type=”number” value =”660″] Tyre name : [tyreField id=”tyrename” name=”tyrename” type=”text” value=””]
[sampleTyre mm=”665″ txt=”Maxxis Ignitor 1.95&#8243 26&#8243″][sampleTyre mm=”660″ txt=”Schwalbe Speedway Pro 26&#8243″][sampleTyre mm=”660″ txt=”Maxxis Larsen 1.9&#8243 26&#8243″]
[sampleTyre mm=”655″ txt=”Schwalbe Black Jack 26&#8243″][sampleTyre mm=”652″ txt=”Kenda Small Block Eight 26&#8243″][sampleTyre mm=”635″ txt=”Schwalbe CX Pro 26″][sampleTyre mm=”609″ txt=”1.75&#8243 24&#8243″]
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
[addToList]

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

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About Us
A Community Amateur Sports Club in Whitton, Ipswich, offering accessible participation in cycle speedway and other cycling disciplines. From keeping fit one evening a week to training for World Championships and Team GB.
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Whittons Sports Centre, Ipswich, IP1 6LW

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info@ipswicheagles.org.uk

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