Rear Disc Brake Adapter for Trek / Gary Fisher Frame - Direct Mount (160mm) for Trek and Gary Fisher frames that was designed This adapter is precision machined, ball burnished and anodized black. The fit and finish far surpasses any alternative Please note that this adapter is a direct mount for frames with the "bump" on the rear dropout.We have two different versions of this adapter available. This model is the "direct mount" version and will accept a 160mm rotor.