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Crabon bikes are fast!

Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Crabon bikes are fast!

Old 06-04-19, 10:30 AM
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PepeM
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Crabon bikes are fast!

Hello, fellow BFers.

Lately, I have been riding my steel pedalbike a lot. It is a nice ride. Steel frame of unknown provenance, Dura Ace 10-speed groupset with downtube shifters, Ambrosio Crono wheels with Vittoria Corsa tubulars (23mm.) Solid ride all around.

Today, I took out my crabon bike out for a spin, after a year laying dormant. Focus Cayo, Force groupset, Psimet crabon tubulars. I followed the same route I rode on my trusty steelstead last week and lo and behold, I went over 2 mph faster on the crabon bike!

For the nonbelievers, I shall present evidence.

Exhibit 1, ride on the steel bike:



Note the average speed (shall not be confused with cruising speed.)

Exhibit 2, same ride on the crabon bike:



That's like a 15% gain in speed!

So, is crabon faster? Discuss.
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Old 06-04-19, 10:33 AM
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Before anyone asks: Both bikes have 165mm cranks, so it cannot be that.
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Old 06-04-19, 10:37 AM
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136w got you 19 mph, 216w got you 19.6?
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Old 06-04-19, 10:39 AM
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Exact same power on both rides probably.

EDIT: Also, that's distance you're looking at. Space-time continuum or something.
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Old 06-04-19, 10:41 AM
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how'd you go farther and climb more on the same route?
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Old 06-04-19, 10:42 AM
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Originally Posted by superdex View Post
how'd you go farther and climb more on the same route?
The magic of carbon.

Or maybe I took a slightly longer way out of the 'hood.
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Old 06-04-19, 10:45 AM
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Old 06-04-19, 10:48 AM
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Once you realize the crabon can asplode at any moment and send you to the hospital/graveyard you will no longer be going so fast.
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Old 06-04-19, 10:49 AM
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Originally Posted by PepeM View Post
Exact same power on both rides probably.

EDIT: Also, that's distance you're looking at. Space-time continuum or something.
Holy crap, everything the elders said was true. You just wake up one day and your brain doesn't work anymore.

Also you said same route so it didn't even occur to me that the distances could be different. Clearly I don't use Strava much.
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Old 06-04-19, 10:52 AM
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My geared bike can beat up your geared bike.



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Old 06-04-19, 10:53 AM
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Traffic lights? Wind?

Also, box rim wheels are less aero than taller rims, which I assume your Psimet carbon wheels are.
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Old 06-04-19, 10:56 AM
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Not a single traffic light along the way. Wind? Maybe, don't recall it being windy either day. The crabon wheels are indeed 50/60 mm deep, but Psimet said on that other thread that it doesn't matter.

Someone pointed out something important on another thread though: In the moving process, I lost one of the screws that fixes the stem in place on the carbon bike.
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Old 06-04-19, 11:01 AM
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On flat level ground: Watt for watt, based on my power meter, heart rate, distance, my 70 pound fully loaded Schwinn Varsity and my 16 pound Cervelo R5 are exactly 1 mph apart in average speed.

The kicker is Aerodynamics between a less agressive posture, and panniers vs agressive posture & moderately aero wheels.

On hills, it's still a crapshoot, with carbon being significantly less work, but the Schwinn having better gearing.

Try again.
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Old 06-04-19, 11:09 AM
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That bike was very well rested,

so of course it was faster. That would even out if you rode them the same amount.
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Old 06-04-19, 11:12 AM
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Originally Posted by WhyFi View Post
My geared bike can beat up your geared bike.



My geared bike has chunks of bikes like your geared bike in its stool.
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Old 06-04-19, 11:12 AM
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I hear they're injecting EPO into the carbon frames now a days...
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Old 06-04-19, 11:16 AM
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I have long been curious as to the origins of the word 'crabon' and why its so popular.

Thats all I care to add to this thread, for now.
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Old 06-04-19, 11:17 AM
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Originally Posted by woodcraft View Post
That bike was very well rested,

so of course it was faster. That would even out if you rode them the same amount.
Interesting point. I will have to test that out.
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Old 06-04-19, 11:27 AM
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Originally Posted by WhyFi View Post
My geared bike can beat up your geared bike.



My geared bike has disc brakes, but so does yours. That makes it a knife fight!
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Old 06-04-19, 11:32 AM
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Originally Posted by PepeM View Post
Hello, fellow BFers.

Lately, I have been riding my steel pedalbike a lot. It is a nice ride. Steel frame of unknown provenance, Dura Ace 10-speed groupset with downtube shifters, Ambrosio Crono wheels with Vittoria Corsa tubulars (23mm.) Solid ride all around.

Today, I took out my crabon bike out for a spin, after a year laying dormant. Focus Cayo, Force groupset, Psimet crabon tubulars. I followed the same route I rode on my trusty steelstead last week and lo and behold, I went over 2 mph faster on the crabon bike!

For the nonbelievers, I shall present evidence.

Exhibit 1, ride on the steel bike:



Note the average speed (shall not be confused with cruising speed.)

Exhibit 2, same ride on the crabon bike:



That's like a 15% gain in speed!

So, is crabon faster? Discuss.
Two routes of different lengths, one of which required significantly (1.6-fold) more power for a marginal (1.14-fold) increase in average speed? Sounds like the carbon bike is far less efficient, even though expectation bias leads you to pedal harder.

Last edited by wgscott; 06-04-19 at 11:35 AM.
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Old 06-04-19, 11:33 AM
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My alloy bike is faster than my carbon bike (to be fair, my alloy bike has deep section carbon wheels and my carbon bike has cheep alloy wheels).
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Old 06-04-19, 11:37 AM
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Originally Posted by wgscott View Post
Two routes of different lengths, one of which required significantly (1.6-fold) more power for a marginal (1.14-fold) increase in average speed? Sounds like the carbon bike is far less efficient, even though expectation bias leads you to pedal harder.
See previous post:

Originally Posted by PepeM View Post
Exact same power on both rides probably.
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Old 06-04-19, 12:02 PM
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What you posted says 137 W vs. 216 W

What are we supposed to believe, and what are we supposed to disregard, and why?
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Old 06-04-19, 12:03 PM
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Originally Posted by wgscott View Post
Two routes of different lengths, one of which required significantly (1.6-fold) more power for a marginal (1.14-fold) increase in average speed?
Not for nothing, but wind resistance doesn't increase linearly with speed. I would be a lot ******* faster if it did.
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Old 06-04-19, 12:04 PM
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Originally Posted by wgscott View Post
What you posted says 137 W vs. 216 W

What are we supposed to believe, and what are we supposed to disregard, and why?
Just a hunch, but I'd disregard the one that says "estimated."
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