Technically you CAN travel through Denver with your OCed firearm, but you cannot get off your bike. I don't have time right now to dig through the law to provide you all of the cites, but I have researched this before and that is the case.
EDIT: If you are OCing a loaded firearm you are not covered by the interstate transportation exemption. You are covered by the protections of Colorado's state preemption laws regarding private motor vehicle travel. That's the part of SB25 that was NOT overturned in favor of Denver.