Nextie has a rim with 30mm internal width: https://www.nextie.com/gravel-AGX-700C

Looks like this frame, although with a different fork: https://chinertown.com/index.php/topic,3739.0.html

This frame is also sold by Tantan as the GR048 with integrated cables. I've recently built it up; here's what I wrote in another thread:
The quality of the frame seems to be good, and the headset area is uniform, comparable to what I've seen from Lightcarbon. The bearings fit securely without being difficult to press in. The frame also looked good on the inside, very smooth with no crinkles visible. Assembly went smoothly, but routing a mechanical groupset through the handlebars would've been a nightmare; even with Di2 it was tight in some spots. Pulling the shifting cable through the chainstay also took some effort.

The full build with bottle cages, computer mount and pedals is 9.1kg. With a lighter saddle and removing the many heavy accessory bolts in the frame, it should go down to around 8.9kg

I've only went on one ride, but first impressions are good. Due to the longer wheelbase, slack steering angle and low BB, it feels very planted and stable on gravel, especially on descends. On the road it almost feels too stable though, coming from a more CX based frame (GR029). Definitely less agile and slower turning. The frame itself feels stiff and efficient, and the handlebars feel much stiffer than my previous Deda Superzero stem/carbon handlebar combo. Will update once I've ridden more.

First 100k done. No real issues apart from fit. I needed to dial the saddle in and refine the position. I tried a 170 crank on this one mainly cuz I got it cheap and there can be a benefit to shorter cranks. I absolutely hate it. I got 175s on all my other bikes and it just feels like I got no leverage on the crankarms when standing up and sprinting up hills. So that will have to go. I found a used sram crank. Luckily I won't have to get another BB. The dub BBs are merely BB30 BBs with a delrin spacer left and right. So just pop these out and put a BB30 crank in and maybe readjust spacing. Also the pedals will have to go. I got so used to the Assioma pedals on my other bike that I'm gonna get a pair of Look Keo-like pedals. The Time pedals feel just way too loose and are giving me anxiety to accidently clip out.

The bike feels great and plenty fast. I got very windy autumn weather here atm. So it's hard to tell just how quick it is. It feels slightly more suceptible to cross winds than my VB-R218. The bars are a pleasant surprise. They feel super solid, very stiff and very comfy. I love the hood shape of the LTWOO. The hands just fall in place. The bike is actually very very comfy which might have to do with the wheels and wide tires. Also, the corner grip with these wheels is off the charts. It's crazy how planted it feels around bends.

The handling is more neutral and a lot more forgiving than my VB-R218. That's no surprise as the 218 has a very steep steering angle and super aggressive steering characteristic. This one is a bit more muted.

The only issue I got is with the front wheel. I get disc rub when standing up. And the rotor has slight play on the hub interface when I rock the front wheel back and forth under braking despite the lockring being torqued down. A bit of research reveals that this seems to be a common issue with centerlock. It might have to do also with the cheap color matched lockrings that I got on Aliexpress. Not sure. I'll get it sorted. It's annoying. This is the first centerlock wheelset that I got. I had 6 bolt interface hubs on my gravel bike where I never had troubles like this. Makes me wonder just what exactly the alleged benefit of centerlock is supposed to be apart from creating another standard.

There's really not anything bad I can say about the LTWOO er9. It just works super reliable. I rode in bad weather. The group got covered in road grime. I washed the bike afterwards. Everything seems solid. So far.

Looks really nice, the color is great! How do you like the wheels? I'm considering getting them as well, pretty much with the same setup with 28mm Tufo's.