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Just to clarify: are you asking if there is U-lock that will mount inside the frame of the Co-op Cycles DRT 1.1? If that is your question, it does not look like we carry anything quite that small. I also ride a size medium DRT and I measured the opening on my bike, it has maybe a 6" x 6" space available for a U-lock to be mounted, which is smaller than even the smallest U-lock we carry. The ABUS Granit X-Plus 54 Mini U-Lock is 5.4" by 4.25", but that does not include the mounting bracket that is sold separately (not at REI, unfortunately).