What do you suggest?
Michelin track tyres fitted and did 1 day at Silverstone, 2 sessions at the DSC day at The Rock on the Friday. Loaded the bike onto the trailer for the 5 hour journey to Croft Tuesday night. Wednesday am, tyre were down to 24psi from the usual 30. Pumped the rear up - front was fine - and applied tyre warmers. 2 short sessions later, came into the garage, applied tyre warmers after first checking their temps - front was 45 degrees and the rear was 70, which really surprised the "temp meter man", who'd never seen a tyre so hot. 40 mins later on removing the tyre warmers, the rear is completely flat. Subsequent valve / seal checks at 75psi revealed nothing at all. Today, after leaving the bike under tension on the trailer, at 40 psi, the rear tyre has not deflated.
So, anyone any thoughts?