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and on what basis do you make that judgement? if it's based on your knowledge of CRR (coefficient of rolling resistance) you'll know you should be on Velo Flex Record or Bontrager Race X Lite Pro/Michelin Latex Tubes if you're not on FMB Silk Tubulars Criterium Tread ..

Rolling resistance is only one part of the equation - I wouldn't suggest Veloflex Record to somebody who thought the Ultremo met their requirements. We can all read the AFM tyre tests, which is why I just put a pair of Vittoria Ultraspeeds (with Mich latex tubes, natch) on my TT bike, but I wouldn't suggest them to somebody who wanted a road race tyre with a good balance of properties either.