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hippy-
It doesn't does it? But that's what my ruler said. TBH it's not vastly worse than the other cranks I measured, there's just less flexibility for buying a really narrow BB to slim down the Q factor. It seems to be that if you want to get down into the 150mm range, then you need to move to road cranks, which is not really what I want to be putting on a child's mountain bike.
ffm
Do all octalink cranks have a stupidly wide q factor? I've just measured some up and between the outside crank faces it's 188mm on a 121mm bottom bracket. The narrowest Octalink BB I can find is 113mm, which would give 180mm, which is still quite wide. I've just measured up various bikes and they range from about 145mm for road bikes up to about 178mm for hybrid/dadbikes, so it's beyond any of those.