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wheelbuilding question(s)-rim sources?



 
 
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  #1  
Old June 8th 05, 05:11 PM
the blur
external usenet poster
 
Posts: n/a
Default wheelbuilding question(s)-rim sources?


hi-
i'm looking to build up a set of fast 700c road wheels (aero) that i'l
use every day in fast group rides. i think i'll use aero bladed spoke
like DT aerolights or sapim cx- ray. i can find hubs with 20/2
drilling (front/rear) but where do i find some aero rims that ar
drilled that way? all i can find are mavic cxp33's with 28 holes. an
suggestions for sources, or other rims to recommend? how abou
non-proprietary paired spoke rims? also, any opinions on bearing dra
for different hubsets? i'm looking at some american classic hubs.
opinions? how about white industries? thanks for opinions
(trying not to spend $800 for rolf prima vigors)

extra questions: the concept of an aero wheel-is it low spok
counts/bladed spokes that make the difference, or the deep rim-or both
are the rims deep and stiff so you can use less spokes, or is the dee
rim important in a slipstream/turbulence decreasing effect? or is th
main effect low spoke number?
why is there no data on wheel efficiency? taking into account bearin
seal drag, wind efficiency, weight distribution (hub vs rim) etc. ha
anyone taken different wheels and just "rolled them down an incline
and tabulated that

--
the blur

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  #2  
Old June 8th 05, 06:15 PM
Jay Beattie
external usenet poster
 
Posts: n/a
Default wheelbuilding question(s)-rim sources?


"the blur" wrote
in message ...

hi-
i'm looking to build up a set of fast 700c road wheels (aero)

that i'll
use every day in fast group rides. i think i'll use aero

bladed spokes
like DT aerolights or sapim cx- ray. i can find hubs with

20/24
drilling (front/rear) but where do i find some aero rims that

are
drilled that way? all i can find are mavic cxp33's with 28

holes. any
suggestions for sources, or other rims to recommend? how about
non-proprietary paired spoke rims? also, any opinions on

bearing drag
for different hubsets? i'm looking at some american classic

hubs.
opinions? how about white industries? thanks for opinions
(trying not to spend $800 for rolf prima vigors)

extra questions: the concept of an aero wheel-is it low spoke
counts/bladed spokes that make the difference, or the deep

rim-or both?
are the rims deep and stiff so you can use less spokes, or is

the deep
rim important in a slipstream/turbulence decreasing effect? or

is the
main effect low spoke number?
why is there no data on wheel efficiency? taking into account

bearing
seal drag, wind efficiency, weight distribution (hub vs rim)

etc. has
anyone taken different wheels and just "rolled them down an

incline"
and tabulated that?


--
the blur


Dear Mr. The Blur,

Putting aside for the moment the prudence of a 20/24 spoke wheel,
one choice is the Velocity Deep V.
http://velocityusa.com/rims/road-rims.php . If I were building a
semi-aero, ultra-light wheel with bladed spokes, however, I would
use an Aerohead OC 28 hole rim for the rear. By the way, there
is plent of data bearing on your questions, which Carl Fogel will
undoubtedly dredge up from the bowels of the internet. -- Jay
Beattie.


  #3  
Old June 8th 05, 07:18 PM
colnalu
external usenet poster
 
Posts: n/a
Default wheelbuilding question(s)-rim sources?



the blur wrote:
hi-
i'm looking to build up a set of fast 700c road wheels (aero)

---8--
i can find hubs with 20/24
drilling (front/rear) but where do i find some aero rims that are
drilled that way?

---8---

Just answering the bit above, try www.corima.fr for some fine carbon
rims in a number of drillings. You might want to confirm what spokes
you have to use, before buying. /Robert

  #4  
Old June 8th 05, 07:21 PM
external usenet poster
 
Posts: n/a
Default wheelbuilding question(s)-rim sources?

On Wed, 8 Jun 2005 10:15:11 -0700, "Jay Beattie"
wrote:


"the blur" wrote
in message ...

hi-
i'm looking to build up a set of fast 700c road wheels (aero)

that i'll
use every day in fast group rides. i think i'll use aero

bladed spokes
like DT aerolights or sapim cx- ray. i can find hubs with

20/24
drilling (front/rear) but where do i find some aero rims that

are
drilled that way? all i can find are mavic cxp33's with 28

holes. any
suggestions for sources, or other rims to recommend? how about
non-proprietary paired spoke rims? also, any opinions on

bearing drag
for different hubsets? i'm looking at some american classic

hubs.
opinions? how about white industries? thanks for opinions
(trying not to spend $800 for rolf prima vigors)

extra questions: the concept of an aero wheel-is it low spoke
counts/bladed spokes that make the difference, or the deep

rim-or both?
are the rims deep and stiff so you can use less spokes, or is

the deep
rim important in a slipstream/turbulence decreasing effect? or

is the
main effect low spoke number?
why is there no data on wheel efficiency? taking into account

bearing
seal drag, wind efficiency, weight distribution (hub vs rim)

etc. has
anyone taken different wheels and just "rolled them down an

incline"
and tabulated that?


--
the blur


Dear Mr. The Blur,

Putting aside for the moment the prudence of a 20/24 spoke wheel,
one choice is the Velocity Deep V.
http://velocityusa.com/rims/road-rims.php . If I were building a
semi-aero, ultra-light wheel with bladed spokes, however, I would
use an Aerohead OC 28 hole rim for the rear. By the way, there
is plent of data bearing on your questions, which Carl Fogel will
undoubtedly dredge up from the bowels of the internet. -- Jay
Beattie.


Dear Jay,

[Bullfrog sees red flannel waving, bullfrog's tongue lashes
out.]

http://damonrinard.com/aero/aerodynamics.htm

The link above to an article by Rainer Pivit has a nice
table of potential aerodynamic improvements due to taping
shoelaces, shaving legs, and so forth.

It indicates that switching to one particular front aero-rim
might save 44 seconds in a 65-minute 40km ride, while a
similar rear aero-rim might save another 18 seconds.

Such small improvements are probably visible only in
predictions, not in averaged test runs, since the wind (and
the rider's breakfast) will normally cause more variation
than 1 minute out of 65 on an outdoor ride:

Out of curiosity, I put 37 km/h for a 65-minute 40 km ride
into this calculator, using a default rider on a triathlon
bike:

http://www.kreuzotter.de/english/espeed.htm

With no wind, the prediction is 213 watts, 64:51.9.

With a 1 mph headwind, the same 213 watts takes 65:56.0.

That's about 63 seconds longer--roughly the 66 seconds that
the other page predicts might be saved by an aero rim.

Carl Fogel
 




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