As your tires had the smooth, shiny outer sidewall I am assuming that they were a set that you glued yourself rather than a set that was bought trued and glued?
If memory serves, all JAP and UFRA tire donuts have at least one sidewall that is smooth. When gluing their tires up, most drivers have this sidewall on the outside - it is one of the things that makes the JAP/UFRA tires less prone to chunking. Unfortunately, it does not help us identify the tire type...
It is perfectly possible that your "better" tires were JAP Medium fronts that were stuck onto rear wheel rims. I have seen this done several times and, while not common, it is a trick I have seen used by drivers who usually race on small, tight or very high grip tracks when they are looking for more rear rotation in the corners.
UFRA also do a Pink Soft rear compound that offer a little more grip than the Pink Medium flavour. So, if your better tires had more grip than the Pink Mediums then they might have been softs.
So, if you want more grip than the Pink Mediums, try the Pink Softs. If you need less rear grip than Pink Mediums, try JAP Mediums.
Hope this helps,
James
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James Garrett - BRCA GT12 Rep
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