Cup racer speedlines

Been offered a set, no buckles but will need a refurb. Come with lightly used michelin slicks (which would be sold on).

Any idea how much these are worth?
 
Without slicks, i wouldnt pay more than £200 if they needed a refurb. But thats my personal opinion, due to the fact that they can be bought brand new so cheap (just over £100 each the race teams pay).