If your fork is front axle through, you need to buy the right size adapters for mounting on the bike rack. We have five specified size adapters: Axle Diameter/Fork Width
When do you need the adapters?
ROCKBROS bike carriers are suitable for bike fork widths under 110mm. You can easily install the bike with quick release, but for the thru-axle bike, you need to buy an adapter separately.
What size for the adapers do we have?
12mm*100mm, 15mm*100mm, 15mm*110mm, 20mm*110mm, total 4 sizes.