CALCULATOR 01
SKID PATCH
Where the tyre wears.
How many places your rear tyre touches down when you skid. Fewer patches means you wear the same spot flat.
日本語 →48 / 16 reduces to 3 : 1
1
One foot forward
2
Ambidextrous
The reduced denominator 1 is odd, so skidding with either foot forward doubles your patches.
Only 1 contact patch. You will wear the same spot flat.
Change the cog (chainring stays at 48T)
| Cog | One foot | Both | Gear inches |
|---|---|---|---|
| 13T | 13 | 26 | 97.0 |
| 14T | 7 | 14 | 90.1 |
| 15T | 5 | 10 | 84.1 |
| 16T | 1 | 2 | 78.8 |
| 17T | 17 | 34 | 74.2 |
| 18T | 3 | 6 | 70.0 |
| 19T | 19 | 38 | 66.4 |
| 20T | 5 | 10 | 63.0 |
| 21T | 7 | 14 | 60.0 |
How it is calculated
Reduce chainring/cog by their greatest common divisor; the denominator is the number of contact patches. Skidding with either foot forward doubles that only when the denominator is odd.
Tyre presets are typical values. Measure your own rollout for an exact figure.