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Gary,
Your Swedish does not seem to be very good. However, being at the tire industry, it would not make any harm to understand some basics of which factors make a tire fast. One of the major factors is the tirewall stiffness. Just have a look at the graphs in the test and edit your post before people will read it. Credibility matters.
P.S. There is some useful info in tirerack.com. You will find out that the weights of RFT 050A and NON-RFT 050A are the same. I don't know how credible their info is, however.
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