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@Sainsburys_Ed
I have a dfour, and it works brilliantly with both 105 chainrings and dura ace ones, I already had a range of chain rings and until I can afford a second PM for the road bike it made sense to buy the slightly more expensive dfour so I can switch it between bikes!as my tt bike has a 55 on it and I prefer 52x36 on the road bike. I'm not really that fussed about how my bike looks though.