Str-1?
 

I recently purchased what I think is an STR-1 Loop Tail. It has no cross bracing inside the down tubes and they don’t roll under the BB.
‘Any idea what year it might be? Unfortunately I’m unable to post a photo since I’m new to this forum.

Does this help? Looks like an SE Bike product....

https://bmxmuseum.com/forums/viewtop...?id=331813&p=1