Danlee.... advice is not easy..... Michael says rear tyre pressure are too low.....
I think he's MILES out.... it sounds to me as though the pressures are too HIGH and you are getting the correct temp. early in the race but the tyres are overheating by the end. A high pressure tyre's 'tread' gets hotter, earlier..... in my opinion (because less of it touches the track)!
Buy an infrared tyre temp gun (about £40 from Maplins)
http://www.maplin.co.uk/infrared-thermometer-with-laser-targeting-223005
Check your tyre temps after 3, 5, 10, 20 etc. laps...... and sneakily take temp readings off your competitors as THEY return to the paddock. Copy the heat signature of the quick guys!
Ian
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