I’ve not come across one, perhaps as there are so few nowadays (?)
If there is one, or if no one cares, then this thread can die a quick death.
If not, then off the top of my head, including production fully rigid full bikes, gears or single speed (but no fat bikes, Monstercross, or expensive custom builds, or obscure things not available in the UK):
> Various Surly things
> Kona Unit
> Marin Pine Mountain
> Genesis Longitude
> Charge Cooker
> Pinnacle Ramin 3 Plus
> Bombtrack things
…I’m already struggling… And almost none of what’s left are dedicated rigid frames, so they all have long bendy sus-corrected forks.
Did there not used to be loads more about a few years ago?
It looks like cheap things like the GT Peace and Haro Mary are gone, Cannondales more expensive Trail SL thingy is gone, Genesis discontinued the rigid Tarn (now frameset only), even Salsa don’t seem to have a stock rigid MTB anymore.
I could be wrong on any of this obviously.
And of course the answer may be that rigid bikes only make sense to an increasingly small number of people, and many of those that it does makes sense for have gone for a gravel bike.