The specs of the frame and fork are what determine which brake caliper you can use. The effective brake reach on Jim's Ram is 54mm, and there are several brakes available that are compatible (including the long-reach Ultegras shown). The AHH has a 65mm brake reach, and Tektro's R556 is the only brake caliper in production that has this reach. There isn't a Shimano alternative to the Tektro.
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