FYI and FWIW: Sturmey-Archer 5- and 8-speed IGHs have been and continue to be available in 120mm OLD models.
How are the present SA 5 and 8 speeds? I've heard/read so many horror stories about their poor reliability.
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The 5 speed seems to have too wide a spread of ratios for my liking but the 8 looks decent although 8th gear is a huge jump from 7th.