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I understand that front wheel aeroz are more important than rear but would you not normally have a deeper rear and shallower front for cross winds?
Front makes more difference to aeroz, rear makes less. Maybe he decided not to bother spending £x00 on another wheel for (very) marginal gains? Smaller rim on the rear will save him a bit of weight, so it would make a very small difference.
Hippy is just through CP1
https://twitter.com/kinesisbikes_uk/status/891591165761507328