For the Fyxation Sparta, max loaded fork weight with a rack is is 20lb (9kg). Staying in this range is reasonable loading. As with any loading on carbon frames/forks, sensible loads and riding conditions should be taken into account.
No the salsa down under rack will not work because it requires bolt holes on the inside of the fork leg. The Tubus Tara rack will work, it’s a great rack choice and I think it’s a sturdier option than the salsa down under. Hope that helps!
For the Fyxation Sparta, max loaded fork weight with a rack is is 20lb (9kg). Staying in this range is reasonable loading. As with any loading on carbon frames/forks, sensible loads and riding conditions should be taken into account.