I’m glad it helped you. It took me much longer to figure it out! 
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Setup isn’t super low. Slight upward tilt on extensions and armpads. As I slide forward, the biggest thing that’s happening is I get uncomfortable on the saddle since I’m now sitting (what feels) too far forward on it. I do get scrunched up a bit. I don’t have this problem as much at higher powers, but anything below around 250 watts (tempo or less) I have to reposition pretty frequently.
At the start of the gif below, I’ve already slid forward. About 2-3 seconds in, I reposition back to where I’m comfortable on the saddle.
edit: nvm fixed it
Does this sliding happen just on the trainer, or outside too.
I like the concept of closing the gap a bit between saddle and bars. Moving the saddle forward makes sense.
I’d also suggest trying to slide just a bit back on your extensions and arm pads for a quick test. See if you still slide forward once your arms and upper body are further back.
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I’ve only noticed it happening inside while on the trainer – I do most of my outdoor riding on my roadbike and usually am only on the tri-bike during races.
I’ll try sliding back on the extensions and see how that feels, and will then try sliding the saddle forward again and stick with it in that position for a few rides to see if I can get used to it.
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So, back from the fitter.
My position wasn’t that far off it seems.
He adjusted the cleats, and moved me a bit forward.
Also worked on my reach, and I ended up with a new, more modern, saddle.
Insoles also, which seem to greatly help.
Will report back once I’ve done a couple of rides…
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Are there any good online resources for sizing a TT bike based off body measurements? Like input various measurements and it either gives me a range for stack and reach, or suggests specific bikes? Or would I be better off waiting for a proper fitting? I’m fine with paying for a fit, but not able to find one in my area that’s open right now with Covid.
First hard ride. Miles better, I can stay on the hoods all the time, I can even tuck in aero position for extended amount of time.
It was my first session in a few days, and my knees still feel a bit rusty. Might have to adapt to the new position and the insoles, but i had no pain for the whole first hour, and after that it was only minor discomfort.
Still getting treatment on my ITB, so that goes hand in hand, but very satisfied for now 
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I can’t say I have seen one for TT use. So much of flexibility comes into play that it might be hard to do anything more than really broad ranges.
That’s what I figured. I would love to get fitted, but it’s just not happening right now. Guess I’ll have to wait.
Do you already have a bike and just want guided adjustments?
I might be able to do some review and make general recommendations like we’ve done for others in this thread.
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No bike yet. My plan was to get a TT fit, and have some bike options that fit me, and pick the bike I want. Or at least get a range of stack & reach that I could find a suitable bike. I don’t know what size bike to buy is the problem. So without an actual in-store fit, I was hoping to use my body measurements (height, inseam, arm length, etc) to find some bike that would fit me. And then search for a bike that I can buy.
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You might have some luck over in SlowTwitch, since they live and breath those bikes more, and might be able to help you ballpark sizing relative to some measurements.
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Ah, good idea. Thanks.
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Hi all, after any hints and tips for my TT/duathalon position…plus helmet advice - (thinking white one looks more aero). I’ve always struggled to put out power in TT position (like ftp 307 and power of 10 miles on TT bike of about 240!), so this morning I did a bit of playing around with my position.
Did a bit of experimenting with moving the saddle height up and down, just on the trainer and using RPE over 45-60 secs but settled on about 35mm higher than previous. Also reduced the angle of the aero bars a little to raise up the elbow pads.
These videos are in the new position just with two different helmets. Any and all tips much appreciated! Appreciate need some longer rides in this position not just 60 secs on trainer!
Thanks
I’d get shims to have equally long legs and let myself slowly adapt to the new fit, even if it took months or years. During that time I’d ignore power balance numbers and lower my expectations on performance.
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Have a question for the fitters in this group, how are you usually dealing with fits for people with abnormal long leg length relative to height combined with short arms?
Proportions:
- Height: 180cm
- Wingspan: 162cm
- Torso length: 48cm
- Inseam length: 86cm
- GT length: 100cm
- Floor to knuckle length/preferred bottom bracket to control position: 85cm
Generally, I prefer the 175mm cranks and the general position of my MTB to my roadbike and I’m realizing that I may have been riding bikes that are too small?
My current Tarmac is a 56 with a 100mm stem that the fitter really only adjusted saddle height/position and feels great on the hoods, but while in the drops descending or sprinting, the bike feels too small.
From some of the math I’ve been doing, I’d actually be better off on larger sizes almost across the board with higher reach and stack than would be expected for someone of my size.
Does this make logical sense?
I have two issues, hope you guys can help me figure out what’s going on…
-
I’ve been trying different saddles for a while now. Started out with a Prologo Nago Evo CPC - it fit my butt fine, but my dam area got numb. So I tried a Prologo scratch 2, which really just plain hurts my butt cheeks.
Now I’m on a Selle Italia SP01 Boost Kit Carbonio, since I can test Selle Italia saddles and if they don’t fit choose another.
I feel like the insides of my legs are rubbing against the saddle, as if it were too wide in the middle/front part. Might that actually be the case or is it more likely to be the position? -
I tend to get tense in the upper back/neck area after rides >50km. I’ve tried different stem lengths, I do regular core/strength exercises. Not sure what it could be, I’ve started to do more shoulder training and also started stretching my neck more.
I’m aware I probably didn’t include nearly enough information here for you to be able to assess how to remedy these two issues, but maybe we can work together and I can then provide the information that might be needed? Your help would be so much appreciated!
Is each saddle in the same position? (unsure if all have same rail height and profile)
My first thought would be to check saddle is not too high. Leg rub can be leg over-extension, numbness can be sitting to far forwards (which happens for a variety of reasons including seat too high). The butt cheek pain is a weird one though, could that saddle have been in a different position that rolled you forwards and engaged glutes more - and you not being used to it?
For the second it could be weight on hands - either one or more of the following:
saddle too far forwards (both pushing weight forwards and not allowing you to to balance)
reach too long
bar drop too long
IMHO first two steps are
- check saddle height using a rough and indicative test - heels on pedals and pedal backwards, do they just maintain contact without your pelvis rocking?
- check weight on hands - at FTPish power can you lift your hands off the bars and hover above or do you fall forwards? NB this will always be harder on a trainer as you don’t have air pushing against your body.
Thanks for the detailed response!
I’ll check the saddle height, allthough it’s pretty much what my bike fit a few years ago indicated. Allthough I am now on a different bike and have a new saddle (as indicated above).
I moved the saddle as far forward as I can, since I feel like I’m too stretched on the bike otherwise (I have a 2019 Scott Foil, size 54 with 110mm stem, before Im had a cervelo R5, size 54 with 100mm stem). The seatpost also has a little setback and the saddle is Selle Italia SP01 Boost - which is a shorter version than the regular SP01.
Regarding butt cheek pain: to clarify, I don’t mean the muscles or so, but really the sit bones. Feels like there’s a lot of pressure in the sit bones, so basically on the very inside of either butt cheek.
Man, this is weird to describe 
Is your saddle too narrow? maybe its not supporting your sitbones correctly?