Actually I was reminiscing X15, which only flew suborbital (so I guess its sub-SSTO) but it was pretty small. Oh and it did require a Stratofortress to carry it through first stage.
https://en.wikipedia.org/wiki/North_American_X-15
What made me "thumbs up" for this one, was that they put a landing gear (not takeoff gear) on it. Meaning on its tail, not a proper fulcrum for takeoff. The X37 has takeoff gear even tho its not made for horizontal takeoffs. This was probably the only spaceplace (real one) that actually had "landing gear".
See? Takeoff gear.Smallest SSTO Challenge
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