Originally Posted by
Polaris OBark
Tie it (securely) between two adult bikes mounted normally in the roof rack.
1. I'm rarely traveling with two adult bikes plus the kid's bike.
2. There is zero chance I'd be comfortable tying my kids bike to my bike (carbon fiber frame/wheels/etc) and then driving at highway speed. I worry enough about my bike up there alone as it is.
I've managed by squeezing her bike in the trunk, but this gets tricky on road trips with other luggage. Thankfully she's ready to move up to a 20" bike, and those seem like they will fit in most roof racks.