DMR Swopouts allow changing between dropout types. These Swopouts are for Mk.1 DMR frames and result in horizontal dropouts to accept 135x10mm axles.Mk.1 DMR frames are identified as having disc mounts with round holes and 1.1/8" head tubes.These Swopouts will not work for Mk.2 DMR frames, as these use Mk.2 Swopout dropouts.