Any ideas? Ideally one that sits on ‘box type’ roof rails…thanks

I’ve been considering this:
Buy a shagged/ cheap hub.
Clamp it to the front bar.
Attach bike.
Rest rear wheel on rear bar, tie down with bungies, or a big zip tie.

Thule is the only one I know of.

561: http://www.thule.com/en/gb/bike-rack/roof-bike-racks/thule-outride-561-_-561000

Comes with 20mm adapter but you have to buy a 15mm one extra.

Thule 565, fits every axle from QR with the supplied adapter to 110mm boost and no doubt fat bikes too

I have two of these and can’t fault them.

Very solid mounts with no movement.

http://www.pendle-bike.co.uk/shopping/fork-mount-roof.php

Any (of the 2) Thule fork racks. For bonus points, avoid buying their overpriced hunk of metal and ask someone to make you a 15mm adapter.

I’ve got a 561 which works well, but it didn’t fit my 20mm lyriks without a generous application of metal file and with the 15mm adapter it fits my Yari’s but they don’t rest at a position where you can slide the maxxel in, you’ve got to lift them – easy enough but a bit faffy.

Given the money they want for a simple tube to make them 15mm the 565 looks a better bet.