Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

"The 33"-Road Bike Racing We set this forum up for our members to discuss their experiences in either pro or amateur racing, whether they are the big races, or even the small backyard races. Don't forget to update all the members with your own race results.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 03-07-08, 10:32 AM   #1
king-tony
Ninja don't wear flipflop
Thread Starter
 
king-tony's Avatar
 
Join Date: Aug 2007
Location: NE TN
Bikes: Specialized S-Works Roubaix SL3, BMC TM01...if it every ships
Posts: 1,443
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
TT Wheel help

40k out and back time trial tomorrow. Wind will most likely be 10-15mph coming from the 1 o'clock direction for the first 10k and then a right cross for 10k a left cross for 10k and from the 7 o'clock position on the way back.

I'm going to run a 404 on front and I am committed to running my PT wheel on the back. The question is should I run it without the disc covers (it is an Open Pro) or with the disc covers. I'm 195# so the wind does not bother me quite as much as lighter riders, but would the energy fighting the cross-wind for 20k cost me more than the aerodynamic advantage of running it as a disc?

Thanks for your help.
king-tony is offline   Reply With Quote
Old 03-07-08, 10:43 AM   #2
jrennie
Race to train
 
jrennie's Avatar
 
Join Date: May 2005
Location: suffering on the back
Bikes:
Posts: 3,115
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Disc cover. Even in a direct cross wind a disc is show to be more aero.
jrennie is offline   Reply With Quote
Old 03-07-08, 10:45 AM   #3
merlinextraligh
pan y agua
 
merlinextraligh's Avatar
 
Join Date: Aug 2005
Location: Jacksonville
Bikes: Wilier Zero 7; Merlin Extralight; Co-Motion Robusta; Schwinn Paramount; Motobecane Phantom Cross; Cervelo P2; Motebecane Ti Fly 29er; Calfee Dragonfly Tandem
Posts: 29,108
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
+1

And 10-15 mph wind shouldn't give you any significant handling problems, particularly at your size.
merlinextraligh is offline   Reply With Quote
Old 03-07-08, 11:44 AM   #4
ElJamoquio
Burning Matches.
 
ElJamoquio's Avatar
 
Join Date: Jan 2006
Location: San Jose, CA
Bikes: Motobecane Le Champion SL, Cervelo P2SL
Posts: 9,666
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 81 Post(s)
Quote:
Originally Posted by merlinextraligh View Post
And 10-15 mph wind shouldn't give you any significant handling problems, particularly at your size.
Really? I've never run them in anything but still air. I'm pleasantly surprised.
__________________
Reacting is mind candy; it requires no thought. Thinking is tedious.

Bikeforums 'Group Buy': Kinlin Rims, Sapim/DT Spokes, Formula/Bitex Hubs


"The only good race pace is suicide pace, and today looks like a good day to die."
-Steve Prefontaine
ElJamoquio is offline   Reply With Quote
Old 03-07-08, 12:38 PM   #5
GatorFL
I miss my bike.
 
GatorFL's Avatar
 
Join Date: Mar 2007
Location: Jax, FL
Bikes: Ridley Excalibur, S-Works Transition
Posts: 408
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by king-tony View Post
would the energy fighting the cross-wind for 20k cost me more than the aerodynamic advantage of running it as a disc?
You shouldn't fight a crosswind anyway. Relax and barely lean into it. If you concentrate on staying straight, you aren't concentrating on going fast. If you're relaxed and focusing on going forward, you only need to barely think about the crosswind to keep the rubber down.
GatorFL is offline   Reply With Quote
Old 03-07-08, 12:44 PM   #6
Stallionforce
Senior Member
 
Stallionforce's Avatar
 
Join Date: Apr 2005
Location: Victoria
Bikes: 05 Norco CRR Team Carbon Dura Ace, 06 Cervelo P2C TT Dura Ace, 88 Olmo Steelie w. Campy Mirage, Cypress CX w. 105
Posts: 1,372
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Disc it up my friend. One day, invest in a lenticular disc, and you will find crosswinds a trifling matter. Good luck tomorrow, wish I had a 40k this early in the season!
Stallionforce is offline   Reply With Quote
Old 03-07-08, 12:45 PM   #7
Stallionforce
Senior Member
 
Stallionforce's Avatar
 
Join Date: Apr 2005
Location: Victoria
Bikes: 05 Norco CRR Team Carbon Dura Ace, 06 Cervelo P2C TT Dura Ace, 88 Olmo Steelie w. Campy Mirage, Cypress CX w. 105
Posts: 1,372
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Good discussion of the physics of it here:

http://ccforums.ipbhost.com/index.php?showtopic=4119
Stallionforce is offline   Reply With Quote
Old 03-07-08, 02:35 PM   #8
cslone
Quarq shill
 
cslone's Avatar
 
Join Date: Jul 2004
Location: Ohio
Bikes: 08 Felt F4, 05 Fuji Team SL, 08 Planet X Stealth, 10 Kona Jake the Snake, 03 Giant OCR flat bar.
Posts: 3,962
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Other than a hillclimb, there's no reason not to run your disc.

Good luck!
cslone is offline   Reply With Quote
Old 03-07-08, 03:00 PM   #9
king-tony
Ninja don't wear flipflop
Thread Starter
 
king-tony's Avatar
 
Join Date: Aug 2007
Location: NE TN
Bikes: Specialized S-Works Roubaix SL3, BMC TM01...if it every ships
Posts: 1,443
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Seems pretty unanimous. They have increased the projected winds to 25mph tomorrow, but from what I am reading it looks like I should still run the covers. Also, thanks for the advice on relaxing with the crosswind. As a big guy I often try to simply power through such things.
king-tony is offline   Reply With Quote
Old 03-07-08, 03:27 PM   #10
Crit Rat
Member
 
Crit Rat's Avatar
 
Join Date: Jan 2008
Bikes:
Posts: 34
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
definitely use the cover.

Power through but power through it forward...
Crit Rat is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 10:30 AM.