Whether you're trying to mount your 160mm rotor with an ISO or post mount setup, we've got the right Shimano Disc Brake Adapters for the job. All you need is the skeleton key to understanding Shimano's admittedly byzantine model naming convention. SM MA stands for Shimano Mount Adapter, so that'll be universal across models and can be safely ignored now that you're here. The rest of the model name is the important part. An F denotes front brake and an R denotes rear brake. The following number 160, 180, or 203 is, of course, the rotor size, with special parentheticals for 203mm rotor conversion. The final two initials respectively describe the caliper type and the framefork mount type with either a P post mount or an S ISO. To alleviate confusion, we've reiterated the front or rear specification at the back. To recap, model number SM MA F160, PS Front is for the front brake F, it accommodates a 160mm rotor 160, it holds a post mount caliper P, and it attaches to an ISO fork mount S.