Having your tyres front & rear at the correct pressure with regards to overall mass & weight distribution and your actual tyre size is as big if not more so a factor than outright tyre/tube combination.
Given the massive 40% differential in tyre sizes used (19-27mm) how can the testing be at all accurate to show the best rolling resistance out of any given tyre/tube combination?
I mean pumping up the 27mm to 120psi is just utterly ridiculous and in a real world scenario where one would want the ideal 15% tyre deflection that would equate to a rider/bike weight of 140+kg! In fact some of the smaller tyres may well have been under inflated at 120psi given the values for the Tufo tyres from 120-200psi, the higher psi values giveing the lower Crr.
We also have no idea on total weight thus how does the tester know what is the correct psi to insert to bring about maximum performance?
other questions I would ask. Did he accurately measure the revolutions per minute, how was this achieved, was the speed constant or an average. If the tyres were warmed up first was the precise warm up procedure done exactly the same for each tire at the exact same revs?
It's a fair effort but doesn't give anything useful in real world scenrios and could lead people to think that the Vittoria Pista EVO was in fact the tyre with the lowest rolling resistance. I absolutely bet it isn't!
