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dglshrn
https://www.bicyclerollingresistance.com/specials/grand-prix-5000-comparison
https://www.bicyclerollingresistance.com/specials/conti-gp4000s-ii-23-25-28
gp5000 28 is 1.5mm wider than gp4000s 25 with the same rim and pressure in the above links