If we can all just agree to weigh our preffered tyres before the next set are fitted...easy database to assemble. Grant
That is assuming that people give a toss. Personally, I don't. I can save weight for free by just going on a diet!!!!
I remember many years ago when people were swapping their Brembo 916 etc wheels for the later Marcheseni wheels "because they were lighter", it was pointed out that the mass difference between the bare wheels was less than the variation in mass of many popular tyre makes at the time.
It's an impossible situation. I would rather have a heavier tyre that lasts and does not explode. And when they add balancing weights to my wheel, I don't question it, but some may. Others might prefer to save unsprung weight by having a lighter tyre that lasts 10 seconds or blows out if you run over a stone. I want to ride on the roads around me with their frequent pot-holes, rocks delivered by tractors, or bits of scrap metal from the docks (who export scrap to Spain) and not get punctures (or worse) every 10 seconds. Race tracks are very different and a race tyre can be less robust. Castle Combe has agricultural farming on the infield, but I assume that farm vehicles can only get across the track in one place and the track is swept where they cross. I hope!