The nashbar frame has a post to IS adapter setup and therefor the caliper will mount on the inside of the frame. This will require the removal of material to space the caliper out a distance equal to the combined thickness of the washer and spacer removed, in this case 2.8mm. The tektro disc brake adapter I have is aluminum, so I can remove the 2.8mm [.110”] with a file. Only the area where the adapter meets the frame will need attention. I will order a spare adapter, file it down, put the washer and spacer on the right and do a fit & function to see how the disc rotor to caliper distance works out on one of my 135 disc frames.