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Engineering101-
Never used gp4s, sorry I can't compare for you.
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Heavier, slower and much more durable.
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Heavier, slower and much more durable. Chris Herbert rode the Pirellis during this year's TCR and liked them.
This place is good for comparing raw specs.
https://www.bicyclerollingresistance.com/road-bike-reviews/pirelli-cinturato-velo-2018
https://www.bicyclerollingresistance.com/road-bike-reviews/continental-grand-prix-4000s-ii-2014
jontea
hippy
Really like the Pirellis cinturato tubeless tyres, only done about 300 mile so far, but the ride very nicely.