Schwalbe Racing Ralph HS 425 the perfect racer. Profile. compound. carcass. In the 3rd generation racing ralph everything is designed to speed. In the 29 & # 8220; version is the arrangement of the blocks specially designed for the L & # 228. ngere Aufstandsfl & # 228; che. You will have the performance advantages of the large & # 223; en Laufr & # 228. the even better to the fore.