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PostPosted: Thu Mar 01, 2012 7:42 pm 
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Joined: Mon Jan 02, 2012 8:09 pm
Posts: 39
Okay I hear you guys on here say that aero trumps weight everytime except uphill TTs. Heres my question I hope you guys can make the right decision on wheels for a race this weekend.

I have a flat 50 mile road race in florida on saturday. Its a 14 mile loop no hills with the exception of a gradual up hill finish. it has maybe 6 turns total. I am 5'7" 149 lbs. I have normally race the American Classic 420 aeros which are pushing 1530 grams but have the oppurtunity to race some zipp 404 aluminum/carbon clinchers. The bike weight with the: 420 aeros weight 16lbs 08 ozs
zipp 404s weight 16lbs 13 ozs

the amount of aero advantage of the: zipp 404 58mm depth
420 aeros 34mm depth

Is the zipps the right choice or should I be leaning to the faster spin up of the 420s. I am on the fence. Thanx for any data or insight you might be able to get me.


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Posted: Thu Mar 01, 2012 7:42 pm 


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PostPosted: Thu Mar 01, 2012 7:46 pm 
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Shop Owner

Joined: Sat Jun 13, 2009 4:02 am
Posts: 1980
Location: NoVA/DC
go with the 404s. the weight difference will save maybe one second TOTAL in acceleration advantage. the 404 is a proven aero advantage.


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PostPosted: Thu Mar 01, 2012 8:05 pm 
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Joined: Mon Jan 02, 2012 8:09 pm
Posts: 39
So even with the weight and spin up difference your saying their is a significant aeroadvantage to the 404s over the 420s that will more than offset the weight and spinup? Do you think the spin up difference is much different?


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PostPosted: Thu Mar 01, 2012 8:09 pm 
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Shop Owner

Joined: Sat Jun 13, 2009 4:02 am
Posts: 1980
Location: NoVA/DC
i think the spin up difference would save almost nothing. hence, my guesstimation of 1 second savings total.


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PostPosted: Thu Mar 01, 2012 8:19 pm 
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Joined: Fri Oct 28, 2011 3:25 am
Posts: 1318
Location: United Kingdom of Great Britain and Northern Ireland
The maths say that about 80% of the effort on a bike is spent pushing air out of the way, and deep section aero wheels are timesavers. But what us cyclists actually know is that in racing you are mostly riding in someone's slipstream, ie. in the dirty air from the guys in front, and do not encounter a smooth air flow unless you are on/off the front. And there are things called sidewinds.

All said, for a short flat race I would go 404's. And 50 miles ... is that a serious race?


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PostPosted: Thu Mar 01, 2012 8:32 pm 
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Joined: Mon Jan 02, 2012 8:09 pm
Posts: 39
Valbrona wrote:

All said, for a short flat race I would go 404's. And 50 miles ... is that a serious race?


Because our Cat4 road race is combined with the Cat 5. its a omnium weekend. Whereas in 2 weeks the Cat 4 road race will be 72 miles. Been racing cat 4 for about 5 weeks and I'm halfway already to my cat 3 upgrade. I cant wait to get to the 80-100 mile races


so you also agree that 404s are a way better option than the 420s for a flat road race.


Last edited by JAX11 on Thu Mar 01, 2012 8:33 pm, edited 1 time in total.

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PostPosted: Thu Mar 01, 2012 8:33 pm 
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Joined: Tue Sep 14, 2010 3:28 pm
Posts: 1405
I've never bought the inertia theory's. At flat road race and criterium speeds aerodynamics will help you accelerate much more than those 200+/- grams weight savings.


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PostPosted: Thu Mar 01, 2012 8:37 pm 
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Joined: Thu Nov 17, 2011 8:26 pm
Posts: 269
Location: Norway
Some seem to forget that weight isn't the only factor in accelerations. Aerodynamics also play a huge role in how easy you will gain speed after a turn as you still need to beat the wind.


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PostPosted: Thu Mar 01, 2012 8:48 pm 
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Joined: Mon Jan 02, 2012 8:09 pm
Posts: 39
Awesome. Thanx for all the responses. I am getting ready to purchase zipp 303 firecrest carbon tubulars soon, but sounds like these 404 aluminum/carbon clinchers will work for now.


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PostPosted: Thu Mar 01, 2012 9:12 pm 
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Joined: Tue Dec 20, 2011 12:43 am
Posts: 284
Location: Los Angeles, CA
404's all the way.

_________________
Cervélo S2 2012 DA9000


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PostPosted: Thu Mar 01, 2012 9:24 pm 
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Joined: Thu Jan 03, 2008 6:14 am
Posts: 1328
Location: by Crystal Springs (Sawyer Creek Trail)
Absolutely 404 will CRUSH the 420s on a course like this. Hell, you could get Lightweight Obermeyers and the 404s would crush them here


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PostPosted: Fri Mar 02, 2012 12:49 am 
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Joined: Tue Sep 20, 2011 8:15 pm
Posts: 177
How you attach your race number will matter more than having aero wheels.


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PostPosted: Fri Mar 02, 2012 1:05 am 
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Joined: Tue Sep 14, 2010 3:28 pm
Posts: 1405
Even still, aero wheels will make you faster.


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PostPosted: Fri Mar 02, 2012 1:49 am 
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Joined: Thu Jan 03, 2008 6:14 am
Posts: 1328
Location: by Crystal Springs (Sawyer Creek Trail)
2011 wrote:
How you attach your race number will matter more than having aero wheels.


Sorry, but I call bullsh!t on that one


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PostPosted: Fri Mar 02, 2012 2:42 am 
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Joined: Mon Jan 02, 2012 8:09 pm
Posts: 39
It must be the anti placebo effect I take these out on the road and they feel sluggish. Is it just my mind knowing there heavier and bulkier. Maybe i should put a different tire on there. right now there is continental gp4000 that are 2 years old the guy says. they are in good shape. Maybe i should put some vittoria diamonte 220tpi or come open corso cx.

the getting going seems harder. But it might be my mind


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Posted: Fri Mar 02, 2012 2:42 am 


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