Size at a glance
| ETRTO / ISO | 40-203 |
|---|---|
| Metric / French | — |
| Imperial (calculated) | 12 x 1.57 |
| Tire width | 40 mm (1.57 in) |
| Rim bead seat diameter | 203 mm |
| Common wheel name | 12-inch |
ETRTO is the only tire size standard that describes a real, measurable dimension, which is why it is the one worth trusting. Read 40-203 as “40 mm wide, on a 203 mm rim”. If the second number matches your rim, the tire fits.
All 1 tire in 40-203
1 listing across 1 model, sorted by brand and weight. Where one model appears more than once, those are genuinely different products — a different casing, colour or claimed weight.
Search another size in the tool
Brands making 40-203 tires
Schwalbe.
Other sizes for 12-inch wheels
Every size below fits the same 203 mm rim.