Tomaz021 wrote:
What would the reason for that be? Also reading all comments is it still fair to assume there is not much difference between the different disc wheels? Is there much difference between a disc wheel and say a 800 rear deep section wheel? Sorry if those questions have all bee answered already but those are questions that were on my mind for a while and I was hoping to get some "generic" quick answers (if that's even possible).
My opinion, based on no data at all and a little knowledge, is that the trailing edge aerodynamics matter (leading edge less so if it is shrouded by a seat tube) and the different inside and outside widths of the rims make them more or less aerodynamic when paired to specific tires. So you want a disc wheel that will adhere to the "105% rule" with your preferred tire. That is, you want the width of the rim (where you would have a brake track if it was a rim brake wheel) to be 105% of the width of the tire WHEN MOUNTED ON THAT WHEEL. Not the number printed on the side of the tire. So that means getting out some calipers and measuring. Next most important things in the order I personally put them is: number of tires that are compatible (some hookless rims have many tires you can't safely use), quality/durability, weight, bearings.
Edit: I would probably put price just in front of weight on my list.
Edit 2: Flo's published difference between an 90mm deep rear and a disc is about 18g at 0 yaw and 50 grams at 15 degrees yaw. With their 60mm wheel at 15 degrees yaw that goes up to about 110 grams. Similar at 0. So... Is that worth $1200 to $2700? Personal decision of course.
Edit 3: One reason that the Boardman tunnel gave lower drag numbers is that they subtracted the drag that they estimated came from the fixture that holds the bike while other tunnels don't. I think it is better not to subtract it because it very well may be different with different bikes/riders and you don't know for sure exactly what to subtract. There may be other reasons too.
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Ed O'Malley
www.VeloVetta.com Founder of VeloVetta Cycling Shoes
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