Size at a glance
| ETRTO / ISO | 37-451 |
|---|---|
| Metric / French | — |
| Imperial (calculated) | 20 x 1.46 |
| Tire width | 37 mm (1.46 in) |
| Rim bead seat diameter | 451 mm |
| Common wheel name | 20-inch |
ETRTO is the only tire size standard that describes a real, measurable dimension, which is why it is the one worth trusting. Read 37-451 as “37 mm wide, on a 451 mm rim”. If the second number matches your rim, the tire fits.
Sidewall markings for this size are not consistent between brands. The same 37-451 tire is also printed as 20x1x3/8 — all of these describe the same rim fit.
All 5 tires in 37-451
5 listings across 5 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 |
|---|---|---|---|---|---|
| Maxxis | DTH | BMX/Dirt | 350 g | Black | Details |
| Maxxis | Holy Roller | BMX/Dirt | 343 g | Black | Details |
| Maxxis | Torch | BMX/Dirt | 349 g | Black | Details |
| Michelin | City J Access Line | Kids | 540 g | White | Details |
| Michelin | Pilot SX Racing Line | BMX/Dirt | 400 g | Black · Tubeless | Details |
Search another size in the tool
Brands making 37-451 tires
Maxxis, Michelin.
Other sizes for 20-inch wheels
Every size below fits the same 451 mm rim.