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″ 26″″][sampleTyre mm=”660″ txt=”Schwalbe Speedway Pro 26″″][sampleTyre mm=”660″ txt=”Maxxis Larsen 1.9″ 26″″] [sampleTyre mm=”655″ txt=”Schwalbe Black Jack 26″″][sampleTyre mm=”652″ txt=”Kenda Small Block Eight 26″″][sampleTyre mm=”635″ txt=”Schwalbe CX Pro 26″][sampleTyre mm=”609″ txt=”1.75″ 24″″] |
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| 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 |