The range of the Shimano Nexus hub is slightly wider than that of other 3-speed hubs: Ratioīicycle manufacturers often assume that the middle gear of a 3-speed hub is the "normal" gear. With any of these brakes, a front brake also should be installed - see my article about braking and turning. The disc brake gets very hot but is made to withstand the heat. The Rollerbrake also is somewhat prone to overheat, though the newer high-power model is less so, with its finned heat sink. The coaster brake is only suitable for flatland use: it will overheat on long downhill runs, like any coaster brake. The current (2017) generation of Shimano 3-speed internal-gear hubs is available with a coaster brake or with an optional external Rollerbrake or disc brake. Shimano SG-3D55 3-speed hub with disc brake
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