The valk is made to run radials. Avon Cobras are the best tire for Valks.
It's also made to run motorcycle tires.

However I use an Austone TT with a Dunlop D404 bias ply on the front and I'm pleased as punch with it, second go round with it.

You'll have to select from the multiple opinions you are apt to get, however the opinion above sounds
pretty decisive. The D404 is a rear tire running backwards the way it's supposed to.
