Wheels - aero or lightweight - what to go for - i am confuse
Comments
-
Dennis - surely it depends on what you are expecting from them? 5MPH increase seems an unreasonable expectation.
On the other hand it would be reasonable to expect a time reduction for say a 10 or 25 TT.
You can't really be saying that aerodynamics are not important!
Mike0 -
If you read the rest of my post you will see what i mean.
There is a certain rolling resistance and aerodynamic resistance experienced when riding (different for each rider, tyre choice and any other number of a long list of variable will effect this resistance)
To go at a constant speed, on a perfectly flat road, with a non gusting wind you will need to output a power that is equal to this resistance.
To go faster, you can do one of two things - increase your power output, or decrease the resistance.
Aerodynamic wheels reduce the aerodynamic drag, so for the same power output, you will go quicker. Its not hype, its simple physics. Unless you are trying to claim that every wind tunnel test ever conducted is nonsense and that all wheels have exactly the same aerodynamic properties? In which case, ill stop posting now and let you get back to worshipping the sun and burning witches.
Hype would be calling a wheel "the fastest in the world" Proving this in a wind tunnel, is science and fact, not hype.0 -
Parsnip49 wrote:If you read the rest of my post you will see what i mean.
There is a certain rolling resistance and aerodynamic resistance experienced when riding (different for each rider, tyre choice and any other number of a long list of variable will effect this resistance)
To go at a constant speed, on a perfectly flat road, with a non gusting wind you will need to output a power that is equal to this resistance.
To go faster, you can do one of two things - increase your power output, or decrease the resistance.
Aerodynamic wheels reduce the aerodynamic drag, so for the same power output, you will go quicker. Its not hype, its simple physics. Unless you are trying to claim that every wind tunnel test ever conducted is nonsense and that all wheels have exactly the same aerodynamic properties? In which case, ill stop posting now and let you get back to worshipping the sun and burning witches.
Hype would be calling a wheel "the fastest in the world" Proving this in a wind tunnel, is science and fact, not hype.
I understand what you're saying. I'm just playing devils advocate as usual. It's sort of a
hobby of mine, along with an extreme case of sarcasm. But you probably already knew
that from some of my previous posts :shock: :shock: . Although I still say that at the
prices they charge and the hype that is claimed for all these wheels, that a 5 MPH gain
is about what I would expect, even though we both know "not gonna happen". Then
again, there are probably cycling newbies and even a few people who have a few miles
under their belts, who fall prey to the lure of being able to "buy" speed.
Dennis Noward0 -
Has anyone mentioned the freewheeling/rolling characteristics of the hubs. At my modest level this seems to be much more important. I recently bought a pair of Eastons and they don't freewheel/roll anywhere near as well as my Dura Ace hubs on my other set of wheels. I suggest forget aeros and go for the best hubs you can afford and reliable rims. Think of the energy you will save.0
-
If you're thinking about how well the spin when in the stand, then I'm afraid that has pretty much no bearing at all on performance on the road. Not only is the rolling performance of a hub under no load not a good indicator of its performance with your weight on it, the losses here are dwarfed by the rolling resistance losses, let alone the aero drag.mike ives wrote:Has anyone mentioned the freewheeling/rolling characteristics of the hubs. At my modest level this seems to be much more important. I recently bought a pair of Eastons and they don't freewheel/roll anywhere near as well as my Dura Ace hubs on my other set of wheels. I suggest forget aeros and go for the best hubs you can afford and reliable rims. Think of the energy you will save.0
