for road,
5s = 120mm
6s = 120 later evolved to 126mm
7s = 126mm, and later evolved to 130mm where it stayed through 11s
mtn bikes were 130mm for 6&7s, then went to 135mm, and some went to 140mm.
Though the number of speeds were a factor, it was an evolutionary process, and doesn't tie to the number of speeds directly.
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