Wow, they're massive. What's the minimum tyre width you can run on those? I normally race on 25/28 but I'd go higher if I could find something fast and reliable in say a 32mm.
What's the minimum tyre width you can run on those?
You probably want a true width of at least 28mm. In practice, that means any "25" which is 25mm on a 15mm rim will be fine, as it will come up to more like 30mm on that rim.
Kinlin TL-23 ?
23mm/28mm:
https://thecycleclinic.co.uk
What size tires will you be using?
edit: dt swiss 521 is only 23mm wide on the outside (the drawing is wrong), but i guess you are only interested in the inner width.