its a Topeak mount
I run tubes with the Tannus Armour tire insert which I highly recommend. it offers better handling for more ridged side walls and its like a run flat for ur tires.
Stock Bottle cage from YT. Had to modify and make some cuts to it to fit everything else under it. Still holds bottle with no issue. Also made a custom strap and mount for a tool under the seat. All of it works well. Went off some big jumps with no issues or rattling.
is the main pivot in there super tight to unscrew? I got the same creek noises as I pedal up. I started to unscrew the main pivot but it got pretty tight after 4 rotations...I stopped there. Didnt want to damage it if I did something wrong. Let me know. Thanks