The DT Swiss gravel rims are quite heavy – I think its because they have gone for a bit of an Aero profile, thus a lot more material. Now I dont know about you but I dont really care much for Aero on my gravel bike, I bet my average speed is not much more than my MTB.
So I went for the XR361 XC Rim.
GR 531 – 24mm – 535 grams
XR 361 – 23mm – 410 grams
XR 331 – 20mm – 380 grams#
or even…
XR 391 – 25mm – 440 grams
all in 29″ 32 hole flavour.
I went for XR361 as I’m using large 50mm gravel tyres but as your replacing an i19 you could probably use the 331 easily. 25mm on a gravel bike is pushing it a bit personally.