Your wattage for 25mph TTs
#51
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#52
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Not really. I would like an answer to the question about body weight on a flat course. Are w/kG so important if you're not climbing? I would guess that if you're putting out 290 watts and averaging 22 mph while other guys are doing 15%+ less and averaging 26 mph it's either an aero issue, a w/Kg issue or both.
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#53
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my elementary and almost certainly incorrect assessment tells me that if it is totally flat than weight would only effect 2 things: acceleration and normal force (thus, friction), which both seem like they would be negligible in a tt, so my guess is no. but, since my guess is no, the answer is probably yes. get it?
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I would like an answer to the question about body weight on a flat course. Are w/kG so important if you're not climbing?
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Weight will matter a little in speed, but remember, if we compare you (I'm going to assume 75kg) to me (54), I'm going to be a scrawny little bastard standing next to you, which means smaller arms, legs, hips, shoulders, chest, etc. All the little things add up, and a much smaller body in weight is probably a much smaller body to the wind.
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Making a kilometer blurry
#59
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I'll give it a shot. Am putting the TT bike on a trainer and playing with fit this week anyway. One question, though - if I move the saddle back, wont that close my hip angle?
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Not really. I would like an answer to the question about body weight on a flat course. Are w/kG so important if you're not climbing? I would guess that if you're putting out 290 watts and averaging 22 mph while other guys are doing 15%+ less and averaging 26 mph it's either an aero issue, a w/Kg issue or both.
But what is throwing me off is Tom vs WR - WR is leaner than Tom but seems to have a much higher Cda even though his position looks good.
Any aero gurus here care to chime in?
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One consideration from Saturday and the numbers I posted - it was windy (mostly cross, some head, some tail). I don't understand the science but I suspect a bigger guy has some advantage in those conditions. Also had a disc wheel cover. In other tetsing I've required around 300W to go 25mph (same bike/position but no clown hat or disc). So it seems like conditions yesterday assisted me somehow.
Position-wise I'd guess I look similar to WR. Probably slightly flatter back, arms maybe a fraction lower, and forearms flat.
EDIT - I do have problems with knees hitting elbows (long legs, shorter torso). So I am slightly "supermaned" and saddle is slightly farther back than I'd like.
Position-wise I'd guess I look similar to WR. Probably slightly flatter back, arms maybe a fraction lower, and forearms flat.
EDIT - I do have problems with knees hitting elbows (long legs, shorter torso). So I am slightly "supermaned" and saddle is slightly farther back than I'd like.
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One consideration from Saturday and the numbers I posted - it was windy (mostly cross, some head, some tail). I don't understand the science but I suspect a bigger guy has some advantage in those conditions. Also had a disc wheel cover. In other tetsing I've required around 300W to go 25mph (same bike/position but no clown hat or disc). So it seems like conditions yesterday assisted me somehow.
Position-wise I'd guess I look similar to WR. Probably slightly flatter back, arms maybe a fraction lower, and forearms flat.
EDIT - I do have problems with knees hitting elbows (long legs, shorter torso). So I am slightly "supermaned" and saddle is slightly farther back than I'd like.
Position-wise I'd guess I look similar to WR. Probably slightly flatter back, arms maybe a fraction lower, and forearms flat.
EDIT - I do have problems with knees hitting elbows (long legs, shorter torso). So I am slightly "supermaned" and saddle is slightly farther back than I'd like.
I have a cheap TT frame, disc cover, and aero helmet.
https://connect.garmin.com/activity/94890724
#63
Making a kilometer blurry
I think my height just costs a lot. I can get my torso to look like other torsos, but my upper arms are long, my legs are long, and my feet are big. There's no way to overcome that other than with power. Even if I look thin, proportionally, someone with my same build on a shorter frame will have narrower shoulders and hips too.
Also, my reported power number is for the bike pictured w/out the wheels. Think 32h alum clinchers. I would say just in equipment alone, I'm looking at 20-30W in drag. Round tubes, road bars, road shifters, training wheels, training tires. The wheels in pic above were there due to RX's generosity and assumption that our "B" team had a shot at the TX state TTT title in the 35+ category (we won).
Would it help to slam the saddle forward and move your base bars forward the same amount (bringing the pads with them)? That would leave your legs back there a bit, and wouldn't affect your arm angles.
Last edited by waterrockets; 06-27-11 at 07:07 AM.
#65
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Approximately 450 watts. Of course that's on the tandem.
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I don't see Tom's pic.
I think my height just costs a lot. I can get my torso to look like other torsos, but my upper arms are long, my legs are long, and my feet are big. There's no way to overcome that other than with power. Even if I look thin, proportionally, someone with my same build on a shorter frame will have narrower shoulders and hips too.
Also, my reported power number is for the bike pictured w/out the wheels. Think 32h alum clinchers. I would say just in equipment alone, I'm looking at 20-30W in drag. Round tubes, road bars, road shifters, training wheels, training tires. The wheels in pic above were there due to RX's generosity and assumption that our "B" team had a shot at the TX state TTT title in the 35+ category (we won).
Would it help to slam the saddle forward and move your base bars forward the same amount (bringing the pads with them)? That would leave your legs back there a bit, and wouldn't affect your arm angles.
I think my height just costs a lot. I can get my torso to look like other torsos, but my upper arms are long, my legs are long, and my feet are big. There's no way to overcome that other than with power. Even if I look thin, proportionally, someone with my same build on a shorter frame will have narrower shoulders and hips too.
Also, my reported power number is for the bike pictured w/out the wheels. Think 32h alum clinchers. I would say just in equipment alone, I'm looking at 20-30W in drag. Round tubes, road bars, road shifters, training wheels, training tires. The wheels in pic above were there due to RX's generosity and assumption that our "B" team had a shot at the TX state TTT title in the 35+ category (we won).
Would it help to slam the saddle forward and move your base bars forward the same amount (bringing the pads with them)? That would leave your legs back there a bit, and wouldn't affect your arm angles.
Not much room for changes on the current bike, but am just building a TT bike so will have the opportunity to work on fit.
#67
Making a kilometer blurry
I still need to get out for some terminal velocity testing sometime. The thing that sucks is that it's always windy in Austin. I might be able to beat it at 6am sometime, but certainly not every day.
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Generally with size comes power at the price of climbing ease. So flats and descents are my friend. Climbing I'll get passed by damn near everyone. Just got to ride your strengths and hold on when you're in a situation that doesn't favor your style.
I'll let the experts fill in the details on weight and aerodynamic drag. I just try to lessen both.
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Just for another data point, here is a 12k tt I did Thursday, out and back. Eddy Merckx. 15-20 mph tail wind on the way out. I'm 5'10" 155 lbs
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I think my height just costs a lot. I can get my torso to look like other torsos, but my upper arms are long, my legs are long, and my feet are big. There's no way to overcome that other than with power. Even if I look thin, proportionally, someone with my same build on a shorter frame will have narrower shoulders and hips too.
Also, my reported power number is for the bike pictured w/out the wheels. Think 32h alum clinchers. I would say just in equipment alone, I'm looking at 20-30W in drag. Round tubes, road bars, road shifters, training wheels, training tires. The wheels in pic above were there due to RX's generosity and assumption that our "B" team had a shot at the TX state TTT title in the 35+ category (we won).
Also, my reported power number is for the bike pictured w/out the wheels. Think 32h alum clinchers. I would say just in equipment alone, I'm looking at 20-30W in drag. Round tubes, road bars, road shifters, training wheels, training tires. The wheels in pic above were there due to RX's generosity and assumption that our "B" team had a shot at the TX state TTT title in the 35+ category (we won).
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I think I read somewhere that "Armstrong was doing 38mph on the flats" in a TT once. At first I thought, that's a ridiculous exaggeration. With a tailwind perhaps, but c'mon. After reading this thread I can see it's possible. In an interview a long time ago, Hincapie said he'd been working on threshold intervals at 500w. Armstrong is probably around the same.
That blows my freaking mind.
That blows my freaking mind.
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Here are some non-aero #s from a couple of weeks ago in St. Louis. Flat, very windy out and back, Merckx style with my travel bike including Gatorskin tires, a huge seat bag, a triple, hairy legs... I had it all going on!
Total Elapsed Time 00:23:00
Distance, mi 8.79
Work, kJ 406
Temperature, °F --
Average Power, Watts 254
Average Cadence 95
Average Speed, mph 22.89
Total Elapsed Time 00:23:00
Distance, mi 8.79
Work, kJ 406
Temperature, °F --
Average Power, Watts 254
Average Cadence 95
Average Speed, mph 22.89