Mudguards: yes, you can mount them. The Grail:ON has mudguard mounts, and we have specially designed our own mudguard set for the bike. You can find it on the Canyon webshop. Shop Grail:ON mudguards:
2XS-S (27,5")
M-2XL (28")
Pannier rack: there are no mounting points for a pannier rack. However, advances in modern bikepacking bag design mean you really don’t need one. We have partnered with Topeak to come up with a lightweight and rugged bike packing setup tailored to the Grail. You can find them here:
Saddle bag
Frame bag