Does anyone know at what ambient temperature the new tyre tests for wet braking are carried out at. It struck me that as the we are being advised to fit cold weather tyres because 'summer' tyres drop their performance below 7 deg C what temperature are these tests carried out at. Is it a lower temperature for cold weather, or winter tyres tyres than for summer tyres? I know that the tests are lab based but even so temperature influences tyre performance so what does the comparison scale mean other than tyre 1 did better in the lab test than tyre 2. But if tyre 1 is a summer tyre and tyre 2 a cold weather, winter tyre and the test was at normal lab temperature say 18-20 deg then tyre 2 could be as good if not better than tyre 1 at 7 deg. Or is this labelling just another smoke and mirrors activity. Although as regards tyre noise I have found it to be quite revealing.When we changed tyres that were (worn) originally labelled 74db, for new ones labelled 69db. The difference was most noticeable in much quieter running even with the new ones at maximum tread depth, but the damn thing wouldnt pull up (joke).