HED wheel question (aerodynamic number interpretation needed)

Triathlon Forum
1

i’m looking at a HED wheel set. i’m getting a jet 90 in the back. i’ve looked at the jet 60 and the 3 spoke for in the front. which is more aero?

2

go to the hed website in the aerodynamics section. drag numbers are posted there.

3

it only tells me about aerodynamics and i don’t see drag stats anywhere. could you give me a link?

4

This is a bit OT but, is there any difference between Specialized’s trispoke and the Hed3? Yes, I know Hed bought the wheel technology from Specialized but I was wondering why people pay a premium for a genuine Hed trispoke. Is it all marketing/name fluff? Or is there more to it?

5

Wind Drag In grams, measured at:
Density .0023755(slug/ft3) temp 61 f, 22mm tire Wind Angle 0° 5° 10° 15° 30° Jet 90 192 163 111 202 209 32 Spoke 221 229 273 283 292

on the product page
http://www.hedcycling.com/wheels/jet90.php
.

6

It is the same mould, but HED has done some stuff differently with the carbon and layup to make them lighter.

7

I’m still running a Specialized set that is about 10-12 years old. The rear is finally going out of true after all these years. Not bad enough to hit the brake pads but if I look back I can see it moving a tad.

8

Wind Drag In grams, measured at:
Density .0023755(slug/ft3) temp 61 f, 22mm tire

Wind Angle 0° 5° 10° 15° 20° 

H3: 190 192 180 161 158 

Jet 60:  195 179 189 214 216

these numbers are from HED’s website.

i have no clue what they mean. if the number is lower, does that mean the wheel is more aero?

9

And would you recommend the Specialized?

10

I just posted this on the other thread about HED but it works here too (I cut out the parts about zipp to make it make sense here)

Which wheels are actually the fastest? 3rd party data will confirm that the fastest wheels in the world are the H3, Stinger 90, Jet 90, and the 808 in clincher or tubular. When you spit hairs you will find that for most people the H3 is the fastest(ask me about the wind yaw angle calculator). When conditions are just right, the Hed 90 wheels and the 808 are indeed faster than the H3 but this window of ideal conditions is quite small which is why the H3 tends to be the all around winner for aerodynamics. Furthermore, Hed 90 wheels test a small fraction faster than the 808 at all angles- this is also true for the Hed 60 wheels vs the 404. My bet, go with the H3 front and rear

11

It’s interesting you say the Hed3 is the fastest because this is the first time I have heard anyone around here say that. I know you sell both Hed and Zipp so it probably makes no difference to you. If you can talk about which 3rd party testing proves this I would appreciate it. I read the tour magazines test and thought it had the 808 on top of the Hed 3 in all conditions except when it was extremely windy and coming directly from the side. I also thought it was nearly impossible to get these conditions. Is this not true? I am not arguing this point, but just trying to get a handle on this mess. Thanks!

12

Unfortunately, the 3rd party tests do not get published often but are out there- these are the tests without hidden agendas and or financed by any wheel company. I dont have any of them on my cpu at home but Ill have to dig them up and forward them to you when i get to the shop!

13

Thanks! I appreciate the insight and the help.

14

I would like the numbers as well also if I could please.

Thanks,

-Steve

15

Wind Angle 0° 5° 10° 15° 20°
H3: 190 192 180 161 158
Jet 60: 195 179 189 214 216

i have no clue what they mean. if the number is lower, does that mean the wheel is more aero?

You want lower numbers. In basic terms, the numbers represent the amount of drag prsent on the wheel at the various wind angles. For instance, head on the H3 and the Jet 60 experience about the same amount of drag, but at a 20 degree yaw angle, you’ll notice that the H3 experiences significantly less drag than the Jet 60.

In the real world, you will always have some degree of wind - it’s not always in your face - and numbers like that show that as the wind angle increases, the aero advantage of the H3 also increases. Lower numbers are better.

16

There was a monster post about this in the summer… at some angles/conditions (not many) the Hed 3 out performs a Disc…

If you need data from a 3rd party, go to Biketechreview.com… there some great stuff up there!