Aero Tires, worth it??
sam
wheel(s). I ride on a QR Kilo with the stock Velocity Deep V wheels
with the stock Krono tires.
I noticed in my last race that almost everone who beat me on the bike
had race wheels. I have been following this NG and reading up on
wheels, but I still can't tell how much race wheels help say over a 40k
bike leg.
It seems that a front tire is way more important than a back one, so
should I pony up the $$ for a good front tire? What race wheels do you
folks prefer? What about a used set of wheels or is this a bad idea
because "trueness" is very important?
Thanks for any help. And yeah I know I can train more and get faster.
:)
-sam
(email remove "nospam")
Pat Brug
traditional 32-spoked wheel. They accounted for weight variations by
varying the amount of water in water bottles etc... The results as I can
best remember ranged from 1) no improvement to 2) ~ 0.5 mph improvement
(Specialized & Spinergy_. Again, the total improvement would be dependent
on the total weight of the bike+rider. Assuming an average bike+rider
weight, I did a quick calculation to tabulate the results. As you can see,
the amount of time saved varies on your ability as indicated in the table
below.
Speed (mph) Seconds Saved Seconds Saved
for 40 km with 0.5 mph with 0.25 mph
increase increase
--------------------------------------------------------------
20 109.12 55.23
21 99.09 50.13
22 90.38 45.70
23 82.77 41.83
24 76.09 38.44
25 70.18 35.44
26 64.93 32.78
27 60.25 30.40
28 56.06 28.28
29 52.30 26.37
30 48.89 24.65
One final comment, I have always ridden on race wheels, but the race
worthiness of your Velocity wheels is under-rated IMHO. You already have a
good aero rim and a wheel that should outperform a stock non-aero wheel. So
your overall time gains will be less than the chart above.
FWIW,
Pat
sam wrote in message <35DB23B2...@yahoo.com>...
sam
sam wrote:
> OK I have been racing for 2 years and am thinking of getting race
> wheel(s). I ride on a QR Kilo with the stock Velocity Deep V wheels
> with the stock Krono tires.
>
Stephen Fleck
> >wheel(s). I ride on a QR Kilo with the stock Velocity Deep V wheels
> >with the stock Krono tires.
> >
The Velocity's are not bad "race wheels" on there own with a set of decent
clincher tires on them. Better and less expensive to get a pair of training
wheels(heavier, more durable, less aero). Train on the training wheels race on
the race wheels.
Steve Fleck
Mark Miller
expecting my new Specialized wheels to come in tomorrow, and it's a relief
to see that my purchase decision has been confirmed in actual tests. (I
don't mind getting beat by better athletes (ok, that's not ENTIRELY true),
but I absolutely DESPISE getting beat by better equipment!)
-- Mark
Pat Brug wrote in message <6rfh7r$afr$1...@newshost.lanl.gov>...
Don Van Wie
Anyone have an estimate of what a pair of 700c velocity deep v clincher
wheels would cost with say shimano 105 hubs and an 8 speed cassette?
I have a carbon fiber Giant Cadex road bike with an aluminum fork and
pretty classic road wheels and was thinking of upgrading to better
wheels for racing tris. All the QR bikes I've seen have the velocity
wheels so I figured they must be a pretty good wheel.
Budget is an issue right now and the HED/Zipp wheels I've priced are
just too much for this year.
Thanks
Don Van Wie
Pat Brug
just over $200, I believe.
For more info see, www.bicyclesports.com
pat
Don Van Wie wrote in message <35DC73...@earthlink.net>...
E.P....@doc.mmu.ac.uk
I don't think you have understood the results. At what speed
do the more aerodynamic wheels give a 0.5mph saving? Whatever it is the
saving will be even more at higher speeds and less at lower speeds. In your
table, the savings are reversed. The faster you go, the more aerodynamics
plays a role. For example, at 30mph there is approximately
(neglecting the negligible surface friction; form drag only, with same rider
position and bike set up) 9/4 times more aerodynamic drag than at 20mph.
Only a small proportion (but probably significant in terms of time savings) of
the overall drag is due to the wheels.
TriEd.
In article <6rfh7r$afr$1...@newshost.lanl.gov>,
> sam wrote in message <35DB23B2...@yahoo.com>...
> >OK I have been racing for 2 years and am thinking of getting race
> >wheel(s). I ride on a QR Kilo with the stock Velocity Deep V wheels
> >with the stock Krono tires.
> >
>
>
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E.P....@doc.mmu.ac.uk wrote:
> Pat,
> I don't think you have understood the results. At what speed
> do the more aerodynamic wheels give a 0.5mph saving? Whatever it is the
> saving will be even more at higher speeds and less at lower speeds.
Actually, Pat has it right...slower riders (within reason - i.e., we're not
talking about riding fat-tired bikes in deep sand here) benefit more than do
faster riders from aero equipment. The reason for this is two-fold:
1) slower riders are on a shallower portion of the power-velocity curve.
Thus, a given decrease in drag (or increase in power) has more of an effect
on velocity than the same change at a higher speed.
2) slower riders take longer to cover a given distance, and thus benefit from
a reduction in drag for a longer period of time.
Good aero wheels are a known "go fast" aid, so anybody not using them is
putting themselves at a distinct disadvantage relative to their competition,
even if they only average 30 km/hour while racing.
E.P....@doc.mmu.ac.uk
a 0.5mph speed increase at 20mph, then there will be approximately a 0.75mph
speed increase at 30mph (assumes aerodynamics is the sole source of drag;
in reality, the speed increase at 30mph would be a little less than 0.75mph).
This would result in a saving over 40Km of around 109secs at 20mph and
73secs at 30mph. Therefore, it is true to say that more aerodynamic wheels
give greater time savings for slower riders.
TriEd.