I've always had to kludge getting my kids bikes on the roof rack to get them to the park. I had some old Thule wheel holders in the garage, removed the clamp-to-bar mechanism, so I slipped a cut up noodle on the legs and clamped it in my fork-mount tray. The front tire wedges nicely between the padded fork arms. Hey presto - instant and cheap (free) front wheel holder!
Add a bungee to maintain tension and you're all set. My 5 year old's 16" Hotrock sits nice and secure in the tray, held by the front wheel and with the rear wheel secured by the tray strap.
My 3 year old's 12" Hotrock simply sits in the wire basket since it has training wheels. Bungee'ed down to the basket, wheels aligned with the wire gaps.
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Thread: Cheap bike rack conversion