grumpier.mike wrote:
I think the Flo data neglects watts to spin. A taller rim has a shorter spoke and the speed of the spoke at the top of the wheel is lower. Aerocoach has some recent data that probably puts the difference in the 4-5 watts range at zero yaw and Swiss Side did some watts-to-spin tresting as well (an extra watt for exposed spoke nipples). A watt is worth about 3-4 seconds in a 40k/25 mile TT, so 12-20 seconds going from a 50 to 90. Multiply by 4-4.5 for an IM ballpark estimate. Let's call it a minute. It isn't a lot, but it isn't 7 seconds either.
That should be it.
Unless the Threadowner is planning for Lanzarote (It will not be Kona because he plans a disk behind), I would advise a 90 in front.
And always train with it. One or the other day you will get some wind blasts from the side and you get used to the feeling.
Last edited by:
longtrousers: Mar 22, 18 0:11