they're expensive

Lo siento Consider getting the fancy puncture-resistant tyres; Considere la posibilidad de obtener los neumáticos resistentes a los pinchazos de lujo; they're expensive, but might save you on the day.
Consider getting the fancy puncture-resistant tyres; Consider getting the fancy puncture-resistant tires; they're expensive, but might save you on the day.
Palabra del día
disfrazarse