Not that i like tantan, but a few thoughts / questions on SPCycle:
they only seem to exist online as an aliexpress seller (Shenzhen dishai industrial co., ltd), which is registered in "Room 206" in a building in Shenzen. Not, let's say, a factory in Xiamen (600km away). Then, SPCycle website takes you to another store front clearly tailored to the west, with the same reference to Shenzhen dishai industrial, which is good, as it implies, that unlike LTWOO, the spcycle store on aliexpress is the same as the online store on www.sp-cycle.com. But neither proves it's an actual factory. Arguably, everything points to the fact it's probably not a factory. None of their content looks like an OEM / factory. They only mention factory space in one sentence somewhere. Maybe it's the retail arm of a manufacturer they're hiding?
Either way, i'd argue SPcycle is less likely than tantan to make their own stuff. To me, they're like velobuild?
I purchased a Spcycle R088 frame, I asked them directly if the R088 frame is produced by them, or if they commissioned it from another manufacturer.
They replied that the mold of the R088 is theirs, that it is made in their factory and that they have not authorized dealers to sell their frame.
Then I told them that TanTan advertises and sells a frame (TT-X70) that seems identical to theirs... they replied that TanTan took only one sample from their factory and that they would not provide any more samples in the future.
I replied them that TanTan took a sample to copy the frame exactly and sell it as TT-X70...I was taken aback by their response: "Yes, this is very likely", as if it were the most normal thing in the world.
They confirmed what I have read on this forum: in the East they have a completely different mentality compared to the Western one and copying the frames of other manufacturers is not (evidently) seen as something unseemly or forbidden/sanctioned and that (except for "premium" brands that try to establish themselves with their own name) wanting to differentiate themselves from other manufacturers is not a priority for them.
Well, I honestly have not understood whether Spcycle is really the manufacturer of the R088 and TT-X70 frames, but I would say that it changes little in practice: it would be like buying a Bottecchia (Italian brand) 8Avio Ultimate, a frame produced and sold by Workswell (WCB-R-316).