I bought a new set of Avon Cobras for the Valkyrie a year ago and then decided to go DS. I installed the front and have ridden it over 16,000 miles. It's not worn out yet, but I want to change it before IZXI. The rear is still in the wrapper, has been stored in the garage, and is available for trade for a new Avon Cobra 150/80-17. Local exchange only.
If anyone needs a rear tire, you could buy a new front tire cheaper and then trade with Disco - that would be a nice discount!