Size at a glance
| ETRTO / ISO | 40-406 |
|---|---|
| Metric / French | — |
| Imperial (calculated) | 20 x 1.57 |
| Tire width | 40 mm (1.57 in) |
| Rim bead seat diameter | 406 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 40-406 as “40 mm wide, on a 406 mm rim”. If the second number matches your rim, the tire fits.
All 4 tires in 40-406
4 listings across 4 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 | Billy Bonkers | BMX/Dirt | 285 g | Performance · Black+Reflex | Details |
| Schwalbe | Green Marathon | Trekking/City | 520 g | Black+Reflex · E-25 | Details |
| Schwalbe | Marathon 365 | Trekking/City | 550 g | Black+Reflex · E-50 | Details |
| Schwalbe | Marathon Racer | Trekking/City | 355 g | Black+Reflex · E-25 | Details |
Search another size in the tool
Close alternatives for a 406 mm rim
These tires have a different width but the same 406 mm bead seat diameter, so they mount on the same wheel. Widths within ±3 mm of 40 mm are shown. Check your frame and fork clearance before going wider.
| Brand | Model | Type | ETRTO | Weight | Build | Link |
|---|---|---|---|---|---|---|
| Maxxis | DTH | BMX/Dirt | 38-406 | 387 g | Black | Details |
| Schwalbe | Marathon Plus Spike | Trekking/City | 42-406 | — | Black+Reflex · E-25 | Details |
| Schwalbe | SX-R | BMX/Dirt | 42-406 | 255 g | Black | Details |
| Continental | Contact | Trekking/City | 37-406 | 420 g | Black/Black · E-25 | Details |
| Michelin | Pilot SX Racing Line | BMX/Dirt | 37-406 | 350 g | Black · Tubeless | Details |
| Michelin | Protek Access Line | Trekking/City | 37-406 | 560 g | Black · E-25 | Details |
| Schwalbe | Little Joe | Kids | 37-406 | 280 g | Performance, ADDIX · Black+Reflex | Details |
Brands making 40-406 tires
Schwalbe.
Other sizes for 20-inch wheels
Every size below fits the same 406 mm rim.