Its a post-RRTY slump ..
Also https://www.aero-coach.co.uk/gp-5000-tubeless-data
How thick is the GP5000 tread compared to GP4000?
2.8mm vs. 2.9mm https://www.bicyclerollingresistance.com/road-bike-reviews/continental-grand-prix-5000-2018
@hippy started
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Its a post-RRTY slump ..
Also https://www.aero-coach.co.uk/gp-5000-tubeless-data