I have PDW guards, they seem to have really little clearance even with 23mm tyres. I haven't been able to adjust them well though as I'm missing the rear bracket and the front bracket hits the bottom bearing cup. I used their QR axle mounts for the stays.
I think I will have the same problem if I try to go to 25mm tyres. It looks like the underneath of the front brake will stop the guard from being pushed up enough.
I've not tried this guy's method (cable ties with rivets and washers) myself but it looks clever.
https://weightweenies.starbike.com/forum/viewtopic.php?f=3&t=142434&sid=c2ed2008abd1b2c1c566be57e1e3e8ea&start=15
I have PDW guards, they seem to have really little clearance even with 23mm tyres. I haven't been able to adjust them well though as I'm missing the rear bracket and the front bracket hits the bottom bearing cup. I used their QR axle mounts for the stays.