Size at a glance
| ETRTO / ISO | 50-203 |
|---|---|
| Metric / French | — |
| Imperial (calculated) | 12 x 1.97 |
| Tire width | 50 mm (1.97 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 50-203 as “50 mm wide, on a 203 mm rim”. If the second number matches your rim, the tire fits.
All 3 tires in 50-203
10 listings across 3 models, sorted by brand and weight. Where one model appears more than once, those are genuinely different products — a different casing, colour or claimed weight.
| Brand | Model | Type | Weight | Build | Link |
|---|---|---|---|---|---|
| Schwalbe | Motion Big Apple | Trekking/City | 220 g | Black+Reflex · E-25 | Details |
| Schwalbe | Motion Big Apple | Trekking/City | — | Brown+Reflex · E-25 | Details |
| Schwalbe | Motion Big Apple | Trekking/City | — | Creme+Reflex · E-25 | Details |
| Schwalbe | Motion Road Cruiser | Trekking/City | 320 g | Black · E-25 | Details |
| Schwalbe | Road Cruiser | Trekking/City | 320 g | K-Guard · Black · E-25 | Details |
| Schwalbe | Road Cruiser | Trekking/City | 320 g | K-Guard · Black+Reflex · E-25 | Details |
| Schwalbe | Road Cruiser | Trekking/City | 320 g | K-Guard · Brown+Reflex · E-25 | Details |
| Schwalbe | Road Cruiser | Trekking/City | 320 g | K-Guard · Creme+Reflex · E-25 | Details |
| Schwalbe | Road Cruiser | Trekking/City | 320 g | K-Guard · Gumwall · E-25 | Details |
| Schwalbe | Road Cruiser | Trekking/City | 320 g | K-Guard · Whitewall · E-25 | Details |
Search another size in the tool
Close alternatives for a 203 mm rim
These tires have a different width but the same 203 mm bead seat diameter, so they mount on the same wheel. Widths within ±3 mm of 50 mm are shown. Check your frame and fork clearance before going wider.
| Brand | Model | Type | ETRTO | Weight | Build | Link |
|---|---|---|---|---|---|---|
| Michelin | City J Access Line | Kids | 47-203 | 290 g | White | Details |
| Schwalbe | Smart Sam | MTB | 47-203 | 325 g | Black · E-50 | Details |
Brands making 50-203 tires
Schwalbe.
Other sizes for 12-inch wheels
Every size below fits the same 203 mm rim.