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Recent Pro Trend for downward tilting saddles

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Recent Pro Trend for downward tilting saddles

Old 02-27-17, 02:43 PM
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link0
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Recent Pro Trend for downward tilting saddles

Basically, tilt your saddle down a bit if you are able to handle a very high amount of saddle to bar drop.

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Old 02-27-17, 03:32 PM
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Originally Posted by link0 View Post
Basically, tilt your saddle down a bit if you are able to handle a very high amount of saddle to bar drop.
What's considered very high? If I have any downward saddle tilt I wind up with numb hands from sliding off the saddle. I run ~4.5" of drop and have a slight upward tilt to my saddle. No issues.

One thing I have found to be true, and obvious in hindsight, is that the more saddle to bar drop I run the less saddle setback I use.

I didn't watch the video.
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Old 02-27-17, 03:42 PM
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Man, everyone in the hot or not thread is going to have to redo their bikes again.
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Old 02-27-17, 03:58 PM
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They're slamming their stems and tilting their seats downward so that in the event of a crash, they are "thrown clear" of those red hot lethal discs.
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Old 02-27-17, 04:27 PM
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They all said it was for comfort reasons. Makes sense to me, my saddle isn't perfectly flat.
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Old 02-27-17, 04:33 PM
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I like a fair amount of drop on my own bikes, but some of those riders are way, way lower. One thing I find interesting about the vid, is that there are UCI rules about the angle of your seat. I never knew that.
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Old 02-27-17, 04:45 PM
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Who says and why do we think that having your ass up in the air relative to your shoulders is more aero. I thought a flat back was more aero. Why is having your back catch air less draggy than having your front catch air?
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Old 02-27-17, 05:03 PM
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Originally Posted by rpenmanparker View Post
Who says and why do we think that having your ass up in the air relative to your shoulders is more aero. I thought a flat back was more aero. Why is having your back catch air less draggy than having your front catch air?
Because we know the ass passes wind most easily.
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Old 02-27-17, 05:12 PM
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I find it amusing that the guys who ride bikes for a living flunk the mantra here of level saddles being the only way to go. I've been told many times I was doing it wrong having all my seats down by the nose. (I fall well short of the UCI limit 9 degrees but I also fall well short of the HB drops in that video.)

Ben
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Old 02-27-17, 05:43 PM
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Originally Posted by rpenmanparker View Post
Who says and why do we think that having your ass up in the air relative to your shoulders is more aero. I thought a flat back was more aero. Why is having your back catch air less draggy than having your front catch air?
Because theres also the head and helmet to raise the profile above the shoulder
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Old 02-27-17, 05:44 PM
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Originally Posted by 79pmooney View Post
I find it amusing that the guys who ride bikes for a living flunk the mantra here of level saddles being the only way to go. I've been told many times I was doing it wrong having all my seats down by the nose. (I fall well short of the UCI limit 9 degrees but I also fall well short of the HB drops in that video.)

Ben
The guys that ride bikes for a living have a greater incentive to suffer with more extreme positions, necessitating the saddle tilt

Also by and large the peloton still maintains level saddles.
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Old 02-27-17, 06:00 PM
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It is to emulate a TT fit a bit more. Not only are the saddles tilted down a bit they are also being slid forward on the rails then the bars are being dropped a bit lower basically clocking the rider around the bottom bracket into a more forward position.
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Old 02-27-17, 06:46 PM
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How low the nose must be before you start sliding down?
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Old 02-27-17, 07:09 PM
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Originally Posted by 79pmooney View Post
I find it amusing that the guys who ride bikes for a living flunk the mantra here of level saddles being the only way to go. I've been told many times I was doing it wrong having all my seats down by the nose. (I fall well short of the UCI limit 9 degrees but I also fall well short of the HB drops in that video.)

Ben
What used to be ain't no more...I guess. Nevertheless, level saddles for me. Mantra is my middle name.
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Old 02-27-17, 07:11 PM
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Originally Posted by redfooj View Post
Because theres also the head and helmet to raise the profile above the shoulder
Is this borne out in the wind tunnel?

I see the biggest drawback is that passing gas does no good. It pushes you down instead of forward.
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Old 02-27-17, 07:24 PM
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Originally Posted by TheRef View Post
How low the nose must be before you start sliding down?
UCI limit is 9 degrees.
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Old 02-27-17, 09:33 PM
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Originally Posted by rpenmanparker View Post
Who says and why do we think that having your ass up in the air relative to your shoulders is more aero. I thought a flat back was more aero. Why is having your back catch air less draggy than having your front catch air?
Speaking from an armchair fluid dynamics perspective, I suspect that your rear end up with your shoulders lower than your butt is more aerodynamic for a couple reasons.
1. Your head is lower and in turn less exposed to "clean air." (think of the frontal profile silhouette, your head doesn't sit above the profile that your torso makes)
2. The "clean air" first hits your head and shoulders and "sticks" along to your back and smooths over your butt. A lot of aerodynamics is about making sure that where air hits a surface, it attaches as long as possible to reduce turbulence. Hence why you see a lot of aero frames tubes being very wide.
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Old 02-28-17, 06:19 AM
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Originally Posted by Sy Reene View Post
Because we know the ass passes wind most easily.


Originally Posted by Xherion View Post
...1. Your head is lower and in turn less exposed to "clean air."...
2. The "clean air" first hits your head and shoulders and "sticks" along to your back and smooths over your butt...
Yeah, there's more scatological humor in there somewhere...
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Old 02-28-17, 07:37 AM
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Speaking as a person with a large saddle to bar drop, it relieves the numbness. There's not much else to it.
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Old 02-28-17, 08:57 AM
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I always say that a tilted saddle is indicative of something else wrong with the fit of the bike. This discussion seems to be an excellent example of that. Put another way, if you have to tilt your saddle down because of how much saddle to bar drop you are running, then you are running too much drop. Perhaps that situation is right for a very specialized type of race like a short time trial, but not for general riding. It makes no difference whether you are an amateur enthusiast or a pro racer.
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Old 02-28-17, 08:59 AM
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Originally Posted by Xherion View Post
Speaking from an armchair fluid dynamics perspective, I suspect that your rear end up with your shoulders lower than your butt is more aerodynamic for a couple reasons.
1. Your head is lower and in turn less exposed to "clean air." (think of the frontal profile silhouette, your head doesn't sit above the profile that your torso makes)
2. The "clean air" first hits your head and shoulders and "sticks" along to your back and smooths over your butt. A lot of aerodynamics is about making sure that where air hits a surface, it attaches as long as possible to reduce turbulence. Hence why you see a lot of aero frames tubes being very wide.
Testing may prove you right, but I can't tell it just sitting in my armchair. The head still had to stick up for you to see. And by the way, the strain on the neck holding the head at that angle must be extreme. That can't be good.
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Old 02-28-17, 09:00 AM
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Originally Posted by TheRef View Post
How low the nose must be before you start sliding down?
Everyone is different. Not much angle sends me forward.
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Old 02-28-17, 09:05 AM
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Originally Posted by rpenmanparker View Post
I always say that a tilted saddle is indicative of something else wrong with the fit of the bike. This discussion seems to be an excellent example of that. Put another way, if you have to tilt your saddle down because of how much saddle to bar drop you are running, then you are running too much drop. Perhaps that situation is right for a very specialized type of race like a short time trial, but not for general riding. It makes no difference whether you are an amateur enthusiast or a pro racer.
I agree with this.
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Old 02-28-17, 09:31 AM
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Originally Posted by Xherion View Post
Speaking from an armchair fluid dynamics perspective, I suspect that your rear end up with your shoulders lower than your butt is more aerodynamic for a couple reasons.
1. Your head is lower and in turn less exposed to "clean air." (think of the frontal profile silhouette, your head doesn't sit above the profile that your torso makes)
2. The "clean air" first hits your head and shoulders and "sticks" along to your back and smooths over your butt. A lot of aerodynamics is about making sure that where air hits a surface, it attaches as long as possible to reduce turbulence. Hence why you see a lot of aero frames tubes being very wide.
Having a large drop does not put your shoulders below your butt..


Not even close.
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Old 02-28-17, 09:38 AM
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Originally Posted by rpenmanparker View Post
I always say that a tilted saddle is indicative of something else wrong with the fit of the bike. This discussion seems to be an excellent example of that. Put another way, if you have to tilt your saddle down because of how much saddle to bar drop you are running, then you are running too much drop. Perhaps that situation is right for a very specialized type of race like a short time trial, but not for general riding. It makes no difference whether you are an amateur enthusiast or a pro racer.
You admit everyone is different, then offer a one size fits all statement?


What would you do differently if you were the rider pictured?


Run less drop?


I'm tall, I have long arms. To get my shoulders low, given my arms are long, I need a lot of bar drop.


When I'm in the drops, with my elbows bent, it puts a lot of pressure on my perineum. Tilting my saddle relieves this pressure. Since I sit on my sitbones and they are firmly planted in my seat, I don't slide forward. My bike fits me very well for the way I ride. If I were short, with stubby arms, I would be fitted differently.

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