In case anyone is wondering, a Triban RC520 road bike will clear mudguards/fenders and 700x38 slicks (albeit the monumental toe overlap). Here is mine, all ready for fall/winter. : r/bicycling
Triban RC520 Disc bike review
What's the widest tire that fits the Decathlon Triban RC 520
Review: Decathlon's Triban RC 520 Disc Road Bike | road.cc
TRIBAN RC 520 Gravel used in 50 cm | buycycle
TRIBAN RC520 Disc Road Bike - 105 used in l | buycycle