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cycleclinic-
There is no 20h front da hub.
I wouldn't ever completely eliminate the possibility, Shimano have frequently made special DA hubs in unlisted drillings, but @busdennis should certainly do a recount before ordering rims in case he has the common or garden 18H version 🙂
gbj_tester
Just bought a Giant Propel frame set so want/need some Aero wheels. I already have some Dura Ace 9000 hubs (20 and 24 hole respectively) so looking for recommendation for 50 to 60mm carbon rims?