The grand sport family is based on a solid 60 tpi casing, a nytech breaker and a durable and super grippy puregrip tread compound Specification: the grand sport race is designed as a balanced, all round tyre the nytech breaker and sufficient puregrip compound in the tread give confidence for effortless and countless racing and training kilometers the grand sport extra offer pure puncture protection the doubled up nytech breaker and three layer sidewall make it a reliable work horse, ideal for heavy training and tough racing conditions the grand sport light, in contrast, has been designed as a competitive tyre, the reduced puregrip compound save's weight, but at the cost of longevity a good level of puncture protection is provided by the nytech breaker weight: 230 grams