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Deep section rear + box rim front = the point?

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Deep section rear + box rim front = the point?

Old 03-07-08, 10:30 AM
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Deep section rear + box rim front = the point?

I've seen this happening in TdF clips and even with the local pathletes. Pardon my plebian logic patterns but doesn't the front wheel slice more wind?

also: what does it say of the community when 50% of fan-assembled youtube clips are soundtracked by Linkin Park
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Old 03-07-08, 10:32 AM
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This is just a guess, but in the same way that you don't commonly see disc wheels used on the front of time trial bikes, perhaps it's done that way for the sake of stability.
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Old 03-07-08, 10:34 AM
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I prefer Ghost in the Shell or Crystal Method for my youtube cycling videos.
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Old 03-07-08, 10:39 AM
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I haven't seen box section wheels on the front but I have seen deep section rears with shallower fronts. Astana was using the eastons but it ws basicly a 303 front and a 404 rear. Logic being they wanted to maximize the aero gains without making it hard to handle. I know someone is going to same a 404 isn't hard to handle in the wind but your not riding for 6+hours in a group of 200 guys. Even small corrections from the wind will result in fatigue faster.

some T-mobile riders ran 808's in the rear and shallower up front.
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Old 03-07-08, 10:43 AM
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I used the set up the OP was speaking of. Out here where it can get pretty windy I found it to be very stable. Also when climbing i still had a significantly light set up. A good example is Mauricio Soler.

But I did ride a 404 rear with mavic up front. I thought it felt and worked great.

as a matter of fact I will use it again.
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Old 03-07-08, 11:11 AM
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Originally Posted by euphoria
I've seen this happening in TdF clips and even with the local pathletes. Pardon my plebian logic patterns but doesn't the front wheel slice more wind?
My guess is wheel change...
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Old 03-07-08, 11:32 AM
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If you're talking deep carbon rims, it's the wind factor.

If you're talking alloy rims, it's the stiffer rear wheel they're after.

Also could be a wheel change as mentioned above.
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Old 03-07-08, 11:37 AM
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Especially if it is a "regular guy" and they are tubulars, cause if he got a flat in front he may ride a regular clincher while waiting for the tire to be repaired or a new one to be glued on.
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Old 03-07-08, 11:45 AM
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Looks like Julich had it the other way...

https://i26.tinypic.com/m73trb.jpg

https://forum.slowtwitch.com/gforum.cgi?post=1678871

Well, temporarily at least.
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Old 03-07-08, 11:57 AM
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Whats up with that chainring?
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Old 03-07-08, 12:00 PM
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Originally Posted by Jynx
Whats up with that chainring?
O.Symetric rings...

https://www.cyclingnews.com/tech.php?...ures/non-round
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Old 03-07-08, 06:40 PM
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Originally Posted by euphoria
I've seen this happening in TdF clips and even with the
local pathletes. Pardon my plebian logic patterns but doesn't the front wheel slice more wind?
:
I think the main reason companies like Campag have done this in their low/mid-range models
is purely so they can brag that their wheels are "lighter than ever before". The Scirroccos, Zondas, etc, used to all have 30mm front rims, but noe they've been dropped to 24mm, 26mm, etc.
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Old 03-07-08, 09:03 PM
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Originally Posted by Jynx
Whats up with that chainring?
Not this again.....

Elliptical- biopace- whatever you want to call them.. that's whats up.
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Old 03-07-08, 09:34 PM
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Originally Posted by euphoria
I've seen this happening in TdF clips and even with the local pathletes. Pardon my plebian logic patterns but doesn't the front wheel slice more wind?

also: what does it say of the community when 50% of fan-assembled youtube clips are soundtracked by Linkin Park
boy, you got that right. there oughta be a law.
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Old 03-08-08, 09:32 AM
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I used a box section front and a rear deep profile wheel when I did road races with screaming fast descents. I found I wasn't comfy in close quarters at 55+ mph with an aero front wheel. The box section front is more stable at those speeds.

A deep section rear wheel is more stable at high speeds due to its stabilizing rudder like effects, even in a crosswind. I've used a rear disk in a crit with 30-40mph gusts with no problems.

My fastest calculated speed based on spinning 160 rpm in a 54x11 is about 60 mph, and that's after I coasted for a while. I had my cadence magnet but left off the speedo magnet (forgot it). This was at Fitchburg when I was off the back in the RR. Felt totally stable at speed in a tuck with a box front and 440 rear.

This past Feb I got a bit nervous with my bladed spoke DV46 at about 50 mph so at some point I'll rebuild with round spokes (I already did this with my race DV46) and I'll also find a carbon non-aero/box section front wheel for racing and/or training.

cdr
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Old 03-08-08, 10:52 AM
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Huh? You're allowed to use discs in crits?
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Old 03-08-08, 07:40 PM
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Originally Posted by operator
Huh? You're allowed to use discs in crits?
Until USAC follows the minimum 16 spoke rule (a UCI one), yes. I'd pair it with a soon-to-be-illegal TriSpoke up front.

cdr
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Old 03-08-08, 11:27 PM
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Soler rode the Mavic R-SYS up front and the Cosmic Ultimate in the rear, at least in the mountains, due to the fact that because the front brake slows the bike considerably more than the rear and the R-SYS has an aluminum rim. This gets rid of the problem of heating carbon with extended braking, and makes for a lighter set of wheels than just a set of R-SYS's since weight plays more of a factor going uphill than aerodynamics, and like carpediemracing said, the deeper rear acts as a rudder.
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