I’ve recently seen some bikes running a normal aero front wheel (60 or 90 etc.) paired with a single H3 rear. What are the advantages of an H3 over a disc for the rear? I understand Lance back in the day found that an H3 was faster in certain conditions over a disc…what are those conditions?
Wind angle mostly, however when he decided to run the H3, Steve Hed did the calculations for him for the course to determine it. It was only a few seconds either way. Since the majority of people dont have this luxury a disk is faster most of the time.
www.hedcycling.com does have a calculator that can compare wheels for you.
yea, I used the calculator…i guess it seems that at a 0-5 degree yaw angle (very rare) the H3 will be faster.
Sounds about right. The increased surface area on the disc helps increase the “sail” effect. As far as two different discs one of the HED employees i talked to said the difference between most discs is less the then the difference between a good and a bad box rim.
Probably no real advantage other than economics. I went with the HED 3 rear because I can ride it as a training wheel since it is bomb proof and not loose a whole lot against a disc for race time. I hated having a Disc sit in my garage for only a few races a year and did not think it gave me a whole lot of benefit since most courses I competed ended up being pretty windy.
and did not think it gave me a whole lot of benefit since most courses I competed ended up being pretty windy.
Which is the best time to use it.
actually windy conditions give you the most advantage with a disc
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What about running a hed 3 rear versus a 90mm
wonder if it’s faster under most conditions…
90mm what? The stinger? If so, the Stinger is better to about 17.5 degrees yaw and then increases and i think after 20 degreest the H3 is better.
90mm what? The stinger? If so, the Stinger is better to about 17.5 degrees yaw and then increases and i think after 20 degreest the H3 is better.
yeah a stinger or 808 (I know is less)
It is my suspicion that the rear wheel ‘sees’ greater wind yaw than the front wheel due to the directional influence on the airflow of the downward leg (The air gets pulled to that side).
It has been discussed here that a deep rim wheel or H3 in the back will be within a few seconds to a disc. A disc is more stable in windier conditions, expecially if you’re using a very deep front wheel.