Our credo when designing the ACID Mudguard Set? Maximum versatility! It fits most 28in trekking bikes with a maximum tyre width of 1.5in / ETRTO 40-622. Clever finishing touches like glossy icon details, the ACID adapter system, FEM-optimised design and an integrated lighting cable guide add style and practicality to any bike. It's even compatible with our ACID rear light integration technology. The complete package! BB-Mount: The mudguard is mounted to the Bottombracket. ST-Mount: The mudguard in short design is mounted to the seat tube with an adapter.