|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
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 |
Ads |
#2
|
|||
|
|||
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
|
|||
|
|||
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
|
|||
|
|||
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 |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
SOme interesting questions | Just zis Guy, you know? | UK | 1 | March 12th 05 05:59 PM |
Rec.Bicycles Frequently Asked Questions Posting Part 1/5 | Mike Iglesias | General | 4 | October 29th 04 07:11 AM |
Wheelbuilding issues | Nate Knutson | Techniques | 13 | May 9th 04 03:29 PM |
Last few newbie questions... (coaster, drum, S-RAM/Nexus, etc...) | Lobo Tommy | General | 5 | April 23rd 04 02:42 AM |
New Bike bought - lots of questions. | Whiskey the Tat | UK | 20 | April 6th 04 03:45 PM |