Originally Posted by
T-Mar
130mm, 7 speed is also popular for a retro-fit option. Many 5 and 6 sppeds being upgraded do not have the necessary relief on the inside of the driveside stays to accommodate the slightly wider fit of a 7 speed without the cogs or chains interfering with the stays (usually the seat stay).
So they're 126 hubs with longer axles and spacers setup for 130 coldset/squeeze 7 speed conversions? Makes sense if you wanted 7 speeds pre-Ultra narrow.