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Racer Tech Thread

Old 03-26-15, 11:15 PM
  #1176  
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anyone have experience with copied frames, the ones with good reputations. how are they?
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Old 03-27-15, 05:16 AM
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Originally Posted by valygrl
You can put a cover on the powertap wheel. Aero Disc Cover - AeroJacket - Wheelbuilder.com

Not legal in all races, but ok at local USAC races.

Those disc covers are well made. I used one in one of the two TTs I have ever done.
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Old 03-27-15, 07:24 AM
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Originally Posted by mike868y
still getting REALLY bad chain drop when cross chaining. but, my chain is super worn, so I'm assuming this is it (need to replace whenever I've got a chance to breath). big chainring is relatively new (replaced in the fall). could it be my rd not tensioning the chain enough (assuming the new chain doesn't fix it)? or is it more likely just that 52/36 rings suck?
got sufficiently pissed that i ordered a new cassette and 50/34 chainrings (have a new chain that i'll be installing as soon as I get a chance). please let this fix the problem.

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Old 03-30-15, 03:01 PM
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Im looking for some 25c tubulars. In the past I've run evo cx's. Any reason to look elsewhere? They will be mounted to Enve Classic's with a 22mm width if it matters.
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Old 03-30-15, 04:09 PM
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Depends how much money you have to spend.
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Old 03-30-15, 04:13 PM
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I would like to keep costs reasonable. The 23 and 25mm Vittoria's are around $70 or so on Amazon, so certainly under $100 per tire. That makes the complete swap about $250 with glue ect. I don't want to spend much more than that for tires
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Old 03-30-15, 04:16 PM
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You can get those for $50-55 each from Ribble. If your max is $100 then you can add Veloflex to the mix as well as Conti Competitions.

I currently race on Corsa CX III 25mm although the wheel set I just bought comes with Specialized Turbo Allround 24mm.
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Old 03-30-15, 07:32 PM
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how much does a tt bike help you compared to a regular road bike, and an aero road bike with clip-on handlebars, aero helmet, deep wheels, etc?

how close can you get to a real tt bike with a venge, aero bars, an aero helmet, and wind booties?

I'm comparing my tt time to that of the 1/2/3 field, and my time would've ranked almost dead last. I used a regular road bike, regular helmet, mavic ksyrium elites, and I leaned my forearm on the handlebars to narrow my shoulders as much as possible. it was a 3 mile tt, with a strong tailwind. I averaged around 27 mph.
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Old 03-30-15, 09:30 PM
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^^ a couple mph. the flatter the course the more the gain
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Old 03-30-15, 11:50 PM
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Originally Posted by Ygduf
^^ a couple mph. the flatter the course the more the gain
a couple mph from the regular road bike to the tt bike or with a tricked out venge with all the accessories to the tt bike?
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Old 03-31-15, 05:13 AM
  #1186  
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Aero vs non-aero frame is worth a few seconds over 40k at most. Clip-ons are worth much more regardless of the aeroness of the frame. The major benefit of a TT bike is that it allows your body to get into a much more aero position than is possible with a road bike frame, which is worth more than aerobars and aero frame combined.
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Old 03-31-15, 09:12 AM
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Originally Posted by spectastic
a couple mph from the regular road bike to the tt bike or with a tricked out venge with all the accessories to the tt bike?

there is too much "depends" to give a flat number.
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Old 03-31-15, 09:41 AM
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Originally Posted by spectastic
how much does a tt bike help you compared to a regular road bike, and an aero road bike with clip-on handlebars, aero helmet, deep wheels, etc?

how close can you get to a real tt bike with a venge, aero bars, an aero helmet, and wind booties?

I'm comparing my tt time to that of the 1/2/3 field, and my time would've ranked almost dead last. I used a regular road bike, regular helmet, mavic ksyrium elites, and I leaned my forearm on the handlebars to narrow my shoulders as much as possible. it was a 3 mile tt, with a strong tailwind. I averaged around 27 mph.
My son has a tricked out Venge - no clip-on bars, uses an aero helmet and 50mm profile 20/24 thin spoke wheels, no water bottle. He also has a FELT DA2 with tri front and disc rear. He does TTs on both. He also TTs the FELT with the spoked wheels. For TTs on the VENGE we flip the seat post forward and tip is 4-5 cm behind BB (not always UCI legal).

On a flat 30 min TT - about 1-2 min difference. I don't think the clip-ons make that big a difference as he rests his forearms on the bar tops.
On a hill about the same and if its more than 3-4% the Venge is faster. Down a hill the felt with disc/tri is MUCH faster (3-4MPH).

Position matters too. A good TT position is different than a good road position. The muscle development is slightly different.

If average speeds are going to be under 25 - Venge is a good choice. 25-30 - likely the TT bike. 30-40+ - TT bike for sure.


Attached Images
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VOS 2015 TT Start.jpg (105.1 KB, 112 views)
File Type: jpg
Muretta TT Dirt.jpg (32.1 KB, 110 views)

Last edited by Doge; 03-31-15 at 09:53 AM.
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Old 03-31-15, 10:49 AM
  #1189  
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Originally Posted by globecanvas
Aero vs non-aero frame is worth a few seconds over 40k at most. Clip-ons are worth much more regardless of the aeroness of the frame. The major benefit of a TT bike is that it allows your body to get into a much more aero position than is possible with a road bike frame, which is worth more than aerobars and aero frame combined.
just a few seconds? tunnel data I know, and it's specialized.. but the result is more than just a few seconds.

also, the main difference is moving the seat forward and lowering the handlebars, right? I don't see why that can't be replicated on a road bike.
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Old 03-31-15, 11:33 AM
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Originally Posted by spectastic
just a few seconds? tunnel data I know, and it's specialized.. but the result is more than just a few seconds.


also, the main difference is moving the seat forward and lowering the handlebars, right? I don't see why that can't be replicated on a road bike.
you answered your own question
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Old 03-31-15, 12:00 PM
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Originally Posted by spectastic
just a few seconds? tunnel data I know, and it's specialized.. but the result is more than just a few seconds.

also, the main difference is moving the seat forward and lowering the handlebars, right? I don't see why that can't be replicated on a road bike.
my e.g. on a 5.5mi 2% climb, my merckx is about the same as a my TT bike. on the 5.5mi 2% decline, my merckx is 1 minute slower. the differences are at like 24mph and 32ish mph, respectively.
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Old 03-31-15, 01:05 PM
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Originally Posted by misterwaterfall
Im looking for some 25c tubulars. In the past I've run evo cx's. Any reason to look elsewhere? They will be mounted to Enve Classic's with a 22mm width if it matters.
Teammate uses those on Enve clinchers (not sure of model) and wins a lot on them. The Veloflex Master 25 is closer to a 24mm and maybe a bit less flat prone.
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Old 03-31-15, 01:08 PM
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Originally Posted by spectastic
also, the main difference is moving the seat forward and lowering the handlebars, right? I don't see why that can't be replicated on a road bike.

You can't get the bars as low, or the seat as far forward, on a road bike.
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Old 03-31-15, 02:05 PM
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Originally Posted by Doge
Teammate uses those on Enve clinchers (not sure of model) and wins a lot on them. The Veloflex Master 25 is closer to a 24mm and maybe a bit less flat prone.
I've had good luck with the evo cx's in regards to flats, but the Veloflex's look pretty nice. Might give them a go just because. Didn't we have someone on here that owned a tire site or something?
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Old 03-31-15, 02:41 PM
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Originally Posted by Doge
Teammate uses those on Enve clinchers (not sure of model) and wins a lot on them. The Veloflex Master 25 is closer to a 24mm and maybe a bit less flat prone.
If he wants tubulars, then PR/Arenberg are what he wants. Same tire, different colored sidewall.

Unless I misread his post.
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Old 03-31-15, 04:03 PM
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Originally Posted by misterwaterfall
I've had good luck with the evo cx's in regards to flats, but the Veloflex's look pretty nice. Might give them a go just because. Didn't we have someone on here that owned a tire site or something?
I misread the tubular part. For 25s - FMBs give a great ride. If dry riding go silks. I bought the Vittoria Cronos CS 24mm this year and my son was plagued by flats. Teammates still had flats on the Vittoria cx in same races, so we were just plagued by flats. My son went all season (2,000 miles racing) last year on the FMBs 25mm and had a race flat from a number pin and post race flat from riding through junk - but in general - pretty good. Anything is good compared to this year. I bought the FMBs again. Son trains on the Veloflex criterium and Arenberg both in 23. The Veloflex 25s are heavier, but hard to fault them as an all around tire and IMO better than the Vittoria.
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Old 03-31-15, 05:26 PM
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FMB's for under $100 each without a bro deal?
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Old 03-31-15, 05:51 PM
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Well...sure, if you go visit with cash.

Competition 25 Cx is EUR83.60 @ current rate USD89.74

But then you have the exchange fees and he likes money wired and shipping.
Franšois Marie Boyaux

Well...sure, if you go visit with cash.

Competition 25 Cx (cotton) is EUR83.60 @ current rate USD89.74

But then you have the exchange fees and he likes money wired and shipping.
Franšois Marie Boyaux

$105 @ WCC $5 less than their price for Veloflex Arnenberg https://www.worldclasscycles.com/mm5/...egory_Code=TTV

Last edited by Doge; 03-31-15 at 06:05 PM.
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Old 03-31-15, 06:09 PM
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Weak sauce argument.
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Old 03-31-15, 06:12 PM
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Originally Posted by spectastic
just a few seconds? tunnel data I know, and it's specialized.. but the result is more than just a few seconds.

also, the main difference is moving the seat forward and lowering the handlebars, right? I don't see why that can't be replicated on a road bike.
Where did they mention the wind speed? 40K @ 20mph is quite different than 40K @ 26mph
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