The trailer wheels have their own axle that stays in place via a spring-loaded ball bearing.

enter image description here enter image description here

(They are quite different from the various axles usually found on bicycles themselves; those have some kind of bolt or clamp at both ends and go into dropouts.)

They’re described in wikipedia

Most trailers have a separate axle for each wheel, like those used on a bicycle. These separate axles usually mount directly on the frame using either threaded nuts, a quick-release mechanism, or some press fit arrangement.

and in this question

...a single sided wheelchair hub. They are light and designed so the wheels are easily removable, which is handy for a trailer that will be packed away often.

but is there an accepted name or term?

  • Don't know, but I'd search for the name of the style of hub as that's where the magic is, and know they're common in wheelchairs. – whatsisname Apr 21 '17 at 4:04
  • 1
    "Wheelchair Hub" would name it exactly to me. – Criggie Apr 21 '17 at 5:28
  • @whatsisname - You assume i knew what the hub style was called. – Martin F Apr 21 '17 at 21:39
  • @MartinF: know, what I mean is you should be searching for "type of hub" as in the hub is the key word, not the wheel. – whatsisname Apr 22 '17 at 0:24
  • @whatsisname in this case, the hub is co-molded into the wheel, so knowing the type of hub isn't very useful either. I don't think there is a term for that type of wheel other than "trailer wheel". Might try searching for "(brand of) trailer wheel"? – CardMechanic May 9 '17 at 16:00

As various people have noted, wheelchair hub is the correct term for these one-sided, push-button release hubs.

Google image search for wheelchair hub

It goes without saying that this type of mechanism is now being widely used in cycle trailers and recumbent trikes, but we still call them wheelchair hubs even though "real" wheelchair hubs have much shorter axles than are commonly found on trailers and recumbents (see image above).

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Other terms i've seen used, on this very website, in addition to the accepted answer, are

  • stub axle
  • one-sided axle
  • tadpole trike hub

From wikipedia.org/wiki/Bicycle_trailer

Some trailers support a normal axle on two sides, others mount the wheel off one side with a stub axle (a one sided axle).

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