lösa hjul

Swedish to English Tech/Engineering Engineering (general) Wheels

Hello

in the phrase "lösa hjul och länkhjul",

I understand that "lösa hjul" are wheels sold without any attachments (just the wheel)

and "länkhjul" are castors

but do we have a phrase for "lösa hjul"

It's just that "loose wheels" sounds like a bit of a misnomer (a wheel that is coming off) and "free wheels" does not sound much better (costs nothing)

Maybe I'm having a bad Monday morning but is there a better term?

Thanks