#61
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windtunnel.. not rollingresistence. you are not going to see 25w if the tires are the same size.
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#62
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Quote:
Quote:
https://www.tiktok.com/@goodgirlspos...06827792911659 But also... what would we talk about instead then? I'll let the engineerds on here answer this but I think it would work the same way since your relative wind-speed is 25mph. |
#63
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The Emonda ALR had Fulcrum wheels. They used the same front tire for all testing.
Quote:
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#64
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I don't really care about going fast except for our Wednesday morning rides. Yesterday, I got dropped on a hill about 25 miles into the 55-mile ride. This is a drop ride; no one waits around. According to my ride file, I then chased solo for the next 5 miles averaging 24.4 mph with an average heart rate of 177 and max of 187 (my actual max is about 190). I certainly was very happy to be riding aero wheels when I barely caught the tail end of the group after 5 miles
But then I got dropped again at mile 40 No amount of aero would have saved me because my legs exploded. But at least it meant I had to ride back solo for 20 miles instead of 30! As a heavy rider trying to keep up with faster folks (I often get dropped on hills and have to chase back on rides like these), I am always happy to have a few free Watts Quote:
Last edited by fa63; 09-06-2024 at 06:30 AM. |
#65
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A quibble I have with this test (perhaps a minor one), but using box shaped rims as a baseline?, come on... I raced in 2015 and pretty much no one raced on wheels like those not in 2010, definitely not in 2015, so it's not really a honest baseline.
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#66
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Can anyone post the article? Fair use - this is for a discussion of a scientific nature.
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#67
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Quote:
Like, the article calls the 2015 Emonda "baseline", but none of the Emondas of that period came stock with box-section rims. They were generally shallow U-section rims. |
#68
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Relative to this discussion, I was watching stage 17 of the Vuelta yesterday. The course profile had a bit of everything (a couple mountain climbs early, rolling hills, flat parts and sprint finish was possible). The break du jour had a Euskatel and a Lotto Destiny rider, both Orbea sponsored. I thought it was interesting that one chose the Orca Aero and the other was on the Orca non- aero climbing bike.
__________________
BIXXIS Prima Cyfac Fignon Proxidium Legend TX6.5 |
#69
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I'm willing to bet if they put on aero bars and wheels that Emonda it would be pretty close to the superbikes. At the local level, fitness trumps aero. Pro peloton where these guys are already pretty much at the peak of fitness, sure aero gains can make a difference.
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#70
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That would have been a relatively easy test to run while they were in the wind tunnel, especially on a bike with externally routed cables. Would have indeed been really interesting to see!
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#71
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I’d like to see how this old junker would stand up against the new ones.
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#72
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Good body position can make up for all the little marginal gains!
pys |
#73
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What if you already have a good body position? Not that I do...
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#74
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Does it have aero bars
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#75
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HAHA
Some Numbers for fellow enginnerds out there: According to authors Wilson and Schmidt in Bicycling Science 4th Ed. 2020, aerodynamic drag is mostly on the body/position of the cyclist. Here are their aerodynamic drag numbers from page 230: Road Bike Touring position (on tops?): 268W to go 10 m/s (or 22mph in old money) Cd Drag Coefficient = 1.0 frontal area A = 0.4m^2 A * Cd drag area = 0.4m^2 Watts (power) to get to 10M/s 230W to overcome aero drag 95kg mass of bike and rider * 0.0045 Cg rolling resistance = 38W of wheel drag at 10m/s Road Bike Racing position (in drops?): 200W Cd Drag Coefficient = 0.88 frontal area A = .36^m2 A * Cd drag area = 0.32m^2 Watts (power) to get to 10M/s = 176W 81kg mass, 0.0030 Cg = 24W rolling drag @ 10m/s - lighter rider and bike, apparently Last edited by ojingoh; 09-07-2024 at 12:23 AM. Reason: quotes |
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