Practical gain from aero bars?
09-14-11, 11:04 AM
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Practical gain from aero bars?
I'm training for a series of TT races and didn't do so great in the first race. It was suggested that I add some aero bars to my road bike. I am considering doing this, but before I plop down a chunk of change, what can I reasonably expect to gain from this addition? If it's simply shaving a couple of seconds off due to being in a more "aero" position, I think I'll pass.
09-14-11, 11:06 AM
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If you install it and can use an aero position properly, you will be close to 1 mph. I remember gaining about 3/4 mph when I started doing tri's and did test with and without the bars.
09-14-11, 11:09 AM
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Given that 90% of the wind resistance is coming from the rider, any difference in posture is significant. In this case, aero bars give you the opportunity to narrow your torso/arms quite a bit, and be lower.
09-14-11, 11:11 AM
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09-14-11, 11:11 AM
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I wonder is that due to having less wind resistance, or does that aero position ergonomically place the body in a more powerful position. I've read that if I use the aero bars that I'd have to adjust the seat to accomodate a new riding position.
09-14-11, 11:12 AM
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I just found this. It's been posted here before and comes from a test in a German cycling magazine.
So you gain 37 watts with aero bars as opposed to the drops
Needed Watts for Speed = 45 km/h :
Stevens San Remo bike with normal handlebar 465 Watts needed to go 45 km/h
Same bike Hands down the drops: 406 watts needed
Same bikeEaston Aeroforce bar: 369 Watts
Same bike Triathlon position (5.5 cm lower bar, saddle forwards): 360 Watts
Same bike Triathlon position (5.5 cm lower bar, saddle forwards) and
carbon Tri spoke wheels front and rear: 345 Watt
Stevens San Remo bike with normal handlebar 465 Watts needed to go 45 km/h
Same bike Hands down the drops: 406 watts needed
Same bikeEaston Aeroforce bar: 369 Watts
Same bike Triathlon position (5.5 cm lower bar, saddle forwards): 360 Watts
Same bike Triathlon position (5.5 cm lower bar, saddle forwards) and
carbon Tri spoke wheels front and rear: 345 Watt
09-14-11, 11:17 AM
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Throw the stick!!!!
Yes, that is a lot. Most riders are happy to gain 20 watts or so in a year of training.
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09-14-11, 11:19 AM
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Think of it as it took 465 watts going all out for this rider to do 28 mph or 406 in the drops. That's almost 10% at that speed.
09-14-11, 11:22 AM
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I gain about 1-1.5 mph with my TT bike over my road bike. I wouldn't gain anything close to this though by putting aero bars on my road bike because I wouldn't be able to put out the same power output for any length of time being in this awkward position.
For example, I am in almost the same body position on my road and TT bikes just rotated more forward on the TT bike. The geometry of the TT bike allows for this more forward rotated position without changing my overall body position much (as if I was on my road bike and someone lifted up my rear wheel a foot or more). Aero bars on a road bike would be a completely new and less efficient position.
For example, I am in almost the same body position on my road and TT bikes just rotated more forward on the TT bike. The geometry of the TT bike allows for this more forward rotated position without changing my overall body position much (as if I was on my road bike and someone lifted up my rear wheel a foot or more). Aero bars on a road bike would be a completely new and less efficient position.
09-14-11, 12:05 PM
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it's the wind resistance. Most people will put out less power in the more aero position, until they train in the new position and adapt to it.
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09-14-11, 02:07 PM
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You should seriously consider getting a proper fit as well. Odds are you'll need to push the seat very far forward and lower the stem. A longer TT in a bad position is likely to be rather uncomfortable and might impede your ability to produce power.
It also takes time to learn how to control your bike properly when you're in the drops. I wouldn't use the aero bars in an event until you feel fully confident.
It also takes time to learn how to control your bike properly when you're in the drops. I wouldn't use the aero bars in an event until you feel fully confident.
09-14-11, 02:13 PM
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Sage advice: Before you start another TT thread, click here.
09-14-11, 03:23 PM
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You should seriously consider getting a proper fit as well. Odds are you'll need to push the seat very far forward and lower the stem. A longer TT in a bad position is likely to be rather uncomfortable and might impede your ability to produce power.
It also takes time to learn how to control your bike properly when you're in the drops. I wouldn't use the aero bars in an event until you feel fully confident.
It also takes time to learn how to control your bike properly when you're in the drops. I wouldn't use the aero bars in an event until you feel fully confident.
09-14-11, 03:24 PM
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Sage advice: Before you start another TT thread, click here.
09-14-11, 03:51 PM
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I gain about 1mph with the same wattage output (~250watts) when I get onto my aerobars, and I didn't move my seat at all from my standard road position.
09-14-11, 03:59 PM
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I'm training for a series of TT races and didn't do so great in the first race. It was suggested that I add some aero bars to my road bike. I am considering doing this, but before I plop down a chunk of change, what can I reasonably expect to gain from this addition? If it's simply shaving a couple of seconds off due to being in a more "aero" position, I think I'll pass.
09-14-11, 04:03 PM
#22
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I remember a thread here a while back saying pretty significant gains were made from those goofy aero helmets too - moreso than aero wheels IIRC.
09-14-11, 04:09 PM
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09-14-11, 04:11 PM
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I've not noticed a huge speed different with aero bars on my road bike in terms of speed. What it does do is provide an additional position to rest my hands and arms that typically bother me on a long ride. I can be just as "aero" on the horns.
