The angled stem, on the wheel with no room for a straight one
Loxan 14" × 2.125, ETRTO 57-254, angled valve
Two 14 × 2.125 tubes with angled valve stems for 14-inch electric scooters and e-bikes, ETRTO 57-254.
What you are getting
Two 14 × 2.125 tubes — ETRTO 57-254 — with an angled valve stem, for 14-inch electric scooters, e-bikes and electric bicycles. $12.70.
It publishes the ETRTO, and it tells you what it does not fit
“Compatible with most 14 inch electric scooters. NOT compatible with 12 inches. Please check the size on your bike tire wall before ordering, 14x2.125 or 57-254.”
Two things worth noting. The ETRTO pair is printed, which only three listings in this group manage — and the listing states a negative, which almost no listing ever does. The buying advice on this page is to photograph the sidewall; this is the one product here that asks you to.
Fifty-seven millimeters of width on a 254 mm (10 in) rim is a small, fat wheel: the shape that carries a motor and a battery at low speed.
The angled valve is the feature
“Upgrade angled valve stem which makes it much easier to air up the tube and could check with your gauge.”
On a 14-inch wheel the rim is small and the hub, motor and disc crowd the spoke face. A straight stem on a wheel that size leaves almost no room to push a pump head on square, and a gauge needs more room still. A bent stem puts the opening where a hand can reach it.
Nothing else in this group has one, because nothing else in this group is this small.
What a 14-inch tube is for, on a cycling site
A 14 × 2.125 tube belongs to an electric scooter, a small folding e-bike or a child’s first bike. It is on this shelf because it is an inner tube with an ETRTO, and because the shelf’s rule — match the two sidewall numbers — is exactly the rule that applies.
What it is not is a bicycle tube in the usual sense: there is no 14-inch road, gravel or mountain wheel.
The listing is short, and that is the whole of it
Two bullets. Size and compatibility in the first, the valve in the second. No material, no weight, no wall thickness, no valve type beyond “angled” — Schrader or Presta is not stated, though a scooter tube at this size is almost always Schrader.
That last omission matters: the pump you own has to fit. Ask before ordering if you only have a Presta pump.
What is not published
No valve type, no valve angle in degrees, no material, no weight, no wall thickness, no pressure range, and no dimensions. It publishes the ETRTO, the negative compatibility and the valve shape, and stops.
Availability
Read on the day this page was built: $13 at the American Amazon shop.
Read from Keepa on the day this page was last revised; stock and price both move without notice.
Prices quoted in this text were read on 2026-10-06. The live price is at the top of the page.
