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Question asked but buried in the tt thread.
I have read about pelvis rotation necessary to get the right aero position.
I'm not convinced I am doing things right. How would you describe to rotate your Pelvis?
I'm lifting the tail bone and pushing back with the arse, feeling like I'm curving my spin inwards and down pushing the 'gentleman bits' into the saddle.
Right or wrong? Having outside hip pain after I finish a session and it feels like a posture/position issue
It's a touchy subject on this forum; most of the nodders think you should sit bolt upright with your bars level with the saddle 😉
It's easier to get a feel for it if you leave your feet off the pedals and just rotate forwards. You will probably need to lower/lengthen your cockpit.
Your saddle will probably need to move down aswell.
It's necessary for if you want to be a record holder......
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That's what I'm aiming for position wise. Saddle is further forward over the bb and much longer/lower reach than the road fit. If anything the saddle is slightly higher though.
But it feels like I'm slouching and just letting my core hang if that is the right phrase. Position seems to recruit the quads much more than the road position
Short TT saddle lower than road bike and pushed forwards to the UCI 5 cm. behind the BB. Perch right on the end!. Note TT saddles are shorter in the nose, so when positioned at 5cm, the wider section where you might rest on will be much further forward than a conventional saddle. I use a Prologo which has softer padding and some grip, previously I used an Ares. The saddle to pad drop also dictates the rotation. Matt Bottrill's saddle to pad drop is 17 cm (measured his bike last week at ToC). He's very flat of back and 6 ft. Mine is 14 cm, and I lowered the saddle to accommodate being less flexible!
The biggest issue is at what hip angle does your power start to decline. The above position is unusual in that the angle is below 90 degrees (BB-hip-shoulder). Mine is 92. He also can't see where he's going! Longer reach is not necessary, in fact compact may be more aero, you want your knees close behind your elbows. Mine are about 2cm behind at the closest point.
I would have thought lumbar flexion was more useful, non?
I think it helps, and I can touch my toes, but it's not just a case of cranking over and resting on the aerobars - power will dissapear. I had to swap seatpost to get my saddle far enough forward on a 73 degree parallel frame. Modern TT bikes have steeper seat angles to achieve this "over the BB" position. Hence the rotation.
There are some very fast TT riders who are not flat. This guy was pretty fast when he was upright.
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Flatter at Rio
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This guy is also fast based on recent form![img] 
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[dick]I enjoy a good bike ride but **** that for a game of soldiers.[/dick]
?
I can easily touch floor even put the back of my hands on the floor. But I can do this by kind of cheating and flexing the lower back / pushing the tail bone out which alters the pull on the hamstrings. That's why I'm trying to work out if I'm cheating with the position and it will cause issues or it's okay. Power wise it seems I'm pushing more not leds watts but can only last 45 mins or so in the tuck
Pulling on the hamstrtings is a sign that the saddle is too high for the forward rotation you have. you are more flexible than I am! I pulled a hamstring in a 25 when my saddle was far forward but the same height as my road bike, I put this down to over-extension due to the hip angle being closed down compared with my road position. Hence the saddle is now lower (about 2cm lower), opening up the hip angle slightly, but being forward, I can still stand on the pedals and applying power is not a problem. Different muscles ache after a ride (and knees a little), but it is not uncomfortable for up to 100 km.
I think that if you can flex your back, then you will be more Tom D and less Bradley W (who is known for his very flat back). Both can be fast.