Road Bike Posture
Take a close look at these two riders' positions.
I like the posture of the rider on the left. His position on the bike has been fit quite well. But what I like the most is his hip position. He sits on the saddle with his hips rolled forward as if spilling water out of the front of a bowl made of his pelvis. In contrast, the rider on the right is sitting on his saddle as if it's a bar stool and he's leaning on the bar. His hips are not rolled forward. No water is being spilled from his 'bowl.' This results in a rounded back and unnatural neck and head position. The only way to see where he is going is to lift his head high and curve the neck thus making it more difficult to breathe. It also puts his legs in a position that reduces his potential for power and he has to reach more for the bars.
For most riders, the difficulty in assuming the more efficient and effective hip position of the rider on the left is crotch discomfort. This may be due to a saddle that is incorrect for the rider's anatomy, or just a poor set up to begin with. If you can't ride comfortably in this 'spilled-bowl' position, the place to start is with a bike fit from a specialist who knows what he or she is doing. I have each of my clients go through a bike fit every winter just to see if anything needs changing even if it's the same bike as for the last fit. Riders are always in the process of getting stronger, weaker, tighter, more flexible, heavier, lighter, more fit, less fit, or whatever. They also tweak their positions throughout the year without telling me. I've yet to have a rider not have some bike-fit changes made every year we have done this for them even though the bike hasn't changed.

9 Comments:
This is a very informative post--it helps to see a picture of the difference. I have been working on assuming this position when I ride, but I find that the difficulty arises from tight hamstrings and glutes. Inflexibility seems to be really limiting my ability to find an efficient riding position, moreso than crotch discomfort.
Couldn't agree more - but you didn't highlight the #1 competitive reason to do whatever it takes to get the "spilled bowl" position - namely that if you want superior aerodynamics, you must roll the hips forward or your back will never be flat, and there's no chance at cheating the wind.
The difference in drag between hitting the drops with a spilled-bowl pelvis rotation and a flat back versus semi-upright with a big hump in the back is eye-popping.
The hamstrings are a barrier a lot too - it's worth taking the time to stretch them out, even if it takes months, to achieve the flexibility necessary.
All my humble opinion of course, but stretching is sure easier than intervals ;-)
I agree with this post 1000%, and I have an interesting sport-specific side note.
I raced bikes for 12 years, and over time arrived at a pretty nice pelvis-rotated forward-flat back position on the bike.. (like the rider on the left)
then I switched sports to elite-level speedskating... and because of the technical demands of the sport & the position you need to hold your body in while traveling 40mph on the ice, I went to the "cat back" pelvis rotated in position, & with a very low saddle height, because that is HOW one skates, and it makes cycling more specific to skating
(we skaters ride a lot, mainly for recovery & staying skinny)
but the facinating thing is, the "inneficient" lower position can sometimes "feel" like you are working harder, as you can create more internal pressure in the quads (think a track cyclist/sprinter, very low saddle position) but really, it's slower for anything other than a sprint, the legs don't "breathe" as effectively (more cramped at the top of the pedal stroke), and it's hard to really roll a big gear for very long..
When I go out for rides with my friends who still race, I always seem to have to make that choice of how I set my saddle, the "right" way where I can ride really fast, or the "skate" way.. to reach my own goals....
excellent post!!!
Joe,
Do you mean that the point of contact between the saddle and the athletes are different in the two photos?
I just watched Steve Hogg's "Sitting Pretty" dvd and he talks about keeping your "sit bones" on the seat at all times.
That is, he never sets cyclist or triathletes up so that they are resting weight on soft tissue.
When I've been "tri-fitted" in the past, a significant amount of my weight was on soft tissue and I could not put out nearly as many watts (even though I was more aerodynamic).
Thanks! Eric
Good examples. I used to look like the rider on the right before I hurt my back. After healing up and doing a ton of core strength work and stretching, my hamstrings are like rubber bands and I can now get into the position on the left with no discomfort.
I'm a big fan of stretching and can't emphasize it enough.
Is this also part of the reason that tri-bikes have a steeper seat tube angle? With your pelvis more on top of the crank, it makes the flat-backed position seem more natural.
Oh, and have y'all noticed that the guy on the right has gone for deeper rims to try & compensate for his bidy's aerodynamics?
Andrew — Sprinters it lower? Nonsense! Not good ones at least. Track sprinters certainly look to have the highest effective saddle height of any style of rider. Take a look at this http://www.pponline.co.uk/encyc/cycling-biomechanics.html
While I agree with the pelvic tilt and aerodynamics, and I love Jens' position, I seems tha maybe more power can be produced with a more normalized pelvic tilt. The examples I serve up are (were) some of the fastest riders in the world:
Lance Armstrong http://www.richardpettinger.com/cycling/lance_armstrong/lancepic/
Danilo Diluca
http://images24.fotki.com/v854/photos/1/108147/4923111/Girost20Sirotti007-vi.jpg
Nathan Oniel
http://cache.viewimages.com/xc/57141368.jpg?v=1&c=ViewImages&k=2&d=17A4AD9FDB9CF193CC300C081D9F4700BB91451FB5D082048C0647900F8B865AA55A1E4F32AD3138
It seems that all these riders have a "natural" position that doesn't roll the hips forward.
I read somewhere that many of the Euros are riding with the hips rotated back position (rider #2, aka the upright bowl position). Also heard from Mike Creed one time (grew up with the kid) that the arched back is actually more efficient wind-wise. Maybe I remember wrong, maybe he was wrong back then, I couldn't tell you.
Having a flat back sure does help me extend over my front wheel more, but it puts immensely more weight on my arms and shoulders, and I don't think I am any more efficient in pedal stroke. In fact, I prefer climbing with the arched back position better, as I feel that I am more behind my pedal spindles for optimal push.
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