If they were only used on the track & the Rims are Mavic SSC, then they alone have to be worth £80 especially if there is no marks on the breaking surface.
Unfortunately, they have been used with brakes. Well one of them has - not to a great degree, but there is minor marking on the brake surface of one rim.
Unfortunately, they have been used with brakes. Well one of them has - not to a great degree, but there is minor marking on the brake surface of one rim.