Where is TT bike development going in 2021/22?

Are you talking about the one they have listed on their homepage or is there a new one?

The (infamous) split downtube bike was apparently ridiculously bad in terms of aerodynamics.

I think that was before the Slick was released.


This thing. Unreleased, seen pretty rarely (not at the Tour for example). Kind of like a „Hope Bike light“

Olympics?

Actually thinking about it it might not be eligible because of the January 1st rule. Does that apply to road events or track only?

Here it is…looks to be unreleased.

Edit: and a teaser from DT Swiss themselves.

https://www.instagram.com/p/CSUHaW-CRYF/?utm_medium=copy_link

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Interesting- eating my words! :joy:

There it is

Generally like that it is made for wider tires. Also, the valve hole cover is a very neat Solution.
What I don’t like is, that it apparently isn’t compatible with 23c tires, and currently, the fastest TT tire is only available in that size.

Edit:
DT Quotes this set up (80/Disc) is 1.8W faster on average than a 80/80.
This really doesn’t correlate with the experience I have made with a disc wheel…

Not read the article - is it head on or over a range of Yaw angles? Or don’t they specify - I’d expect swissside to be pretty through with their testing.

I’m happy though, validates my life choices not to buy a disc… yet.

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Here’s the image from the article:

The article only says it saves 2 watts at 45kph with no mention of angles or averages.

That average could be skewed in either direction by looking at different yaw angles or by taking a straight average vs a weighted average for the yaw angles that they expect the disc to see in competition.

But based on that plot, the disc makes little difference out to about 10deg of yaw. It’s at 15deg where it’s saving you ~4W

Just saying, that this might be an indication that wind tunnel and velodrome testing (with straight air) gives an overly good result for a rear deep section wheel, while in the real world a rear disc might be better by a bigger margin than that.

I am saying that, because a rear disc has done loads to my speed, absolutely noticeable and measurable in added speed and stability.
2W at 45kph (310W or so for me) are not measurable or noticeable.

Curious to hear what your experience has been re: increases in speed for a disc vs. a deep section rear?

I’ll pretend you’re lying or ignore your comments, due to aforementioned life choices and recent disappointments in races. :upside_down_face:.

However, I’m not surprised by that little difference between discs. Like you say surprised by the little difference between 80 and disc, but it could be that the DT Swiss 80s work very well with the Canyon speed max.

Out of interest what wheels did you upgrade from & to, same bike?

I wonder how much of that speed is due to an increased feeling of stability. Especially because you already put yourself in an very unstable position, any improvement in stability will probably allow you to pedal that much harder without worrying about crashing into a ditch. So while any engineering data is going to say its 4W faster it ends up making you 15W faster because it feels better.

I have not upgraded, but bought the Shiv with 64mm front and back and disc wheel included.
In the beginning i was super careful, and only used the 64s because disc wheels are dangerous in the wind.
I do my workouts on the same stretches of road all the Time, and i haven’t compared them perfectly, but my intervals have gotten faster, over 1kph since using the disc, for around the same power (although threshold has become tempo).

The reason why the figure of 1.8W baffles me, is because I did an aero testing and the Swissside H-U 80 dB were over 4 watts faster than my Roval 64 (45kph).
That is just the front wheel, same 23c tires and a depth difference of just 16mm.
Front wheels have a bigger impact, I know, but the rear wheel goes from 80mm to disc, which is a significantly larger jump.

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They really aren’t…I can’t think of a single course / condition where I would hesitate to use a rear disc. Were I ever able to qualify for Kona, I would run a disc there (if they allowed it).

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Same here. I run my disc cover all the time (since it’s a pain to take it off and on) in strong Prairie winds and it’s the front wheel that gets blown around and makes things feel more unstable than the rear - - having an extra Torhans Aero 30 hanging off the front probably doesn’t help on strong crosswinds either though.

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That’s why I a wrote it like this.

I live near the North Sea shore, it gets very windy and especially gusty.
I have not ridden a single mile on my TT bike without the rear disc in over Ă  year.
80mm or tri-spoke for good weather and 51mm for bad weather.

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Definitely…anything that you have in front of the steering axis that is susceptible to crosswinds will make your bike feel more unstable. Even the nosecone on my 1st-Gen Shiv TT can be felt in a crosswind somedays.

Discs, not so much.

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Ah…I took the italics for emphasis on the point, not sarcasm. My bad.

Which is good 'cuz I was kinda surprised you woulda had that take given your extensive experience on a TT bike! :sunglasses:

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I was too lazy to write it WiTH tHe rANdoM CaPs😂

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