Honestly, I don't see an issue to go further than 8, I mean in 99% of your lifetime you will have clothes on and I assume that you would still look good in short pants after doing 10 cm. Nevertheless, it is also up to your body and flexibility how your body would handle such a new height. Therefore, I would recommend to start and decide your final goal during the lengthening for example after you have reached 6 or 7 cm. Listen to your body and find your final size based on that rather than be focused on one final number. Hope you understand what I mean.
That's my diary: http://www.limblengtheningforum.com/index.php?topic=71436.0
I am going through the same process right now and honestly although my ratio seems to be bad based on the numbers, so far nobody have mentioned or noticed that my femurs might be a bit longer than they should be. But this is only my personal experience in this regard. Finally you will regret stopping at 6 although your body would be able to go further at least this is what I would do 
So good luck and keep strong. The first weeks are the hardest!
Need advice on how much i should lengthen my femur
Hey Taller90,
the part of maybe regretting to have stopped at 6 cm was mentioned by Prof. Dr. Betz as well. I think your approach, deciding in the process, is quite valuable.
I have already read your diary and saw the pictures and I agree, your proportions look good despite having lengthened "so much".
Another concern is doing (light) sports like jogging with such long femora. I would like to go back to doing sports like jogging several times a week until the end of my life and I don't know how the femur / tibia ratio will affect that. And while I can evaluate my proportions during the lengthening of my femora and stop if I think i reached a certain point, I can't do that for the ability to run long term. So I tend to be a little bit more conservative with the length goal from beginning....
I will have surgery next month... 
I am glad if I helped brother. It's a sirious surgery snd not to be underestimated. Also please note I HAVE NOT done it myself and it is very obvious how much i value safety.
I am personally an extremely patient person, meaning, if i was you (and valurd proportions to the maximum) I would go for the 6cm and ENJOY my new height. Then after it is possible (having recovered and enjoyed the height) maybe go for a 2md one on the tibias for 4-5 cm.
Aesthetically that would be the best in my opinion.
By the way, i must agree with a point a person above made and it was to have your arms down so the wingspan can be shown.
For example me myself my armspan is 176-177cm,meaning the maximum i should go for is 180-181 (tty to not exceed 5 cm over wingspan bcs then thats when some people might look twice)
Also if you at any point overthink too much the proportions just keep in mind that 99.999% of peopld do not notice it at all. Literally not a second.
Obviously, do not go for crazy amount like 20cm. But if i had to give an estimate, i personally think every guy at the 170-177cm range can easily pull off a 6-10cm lengthening
That is judging by all the mock ups i have seen
Shorter men (165-170cm) usually pull off greater lengthenings since most of the time(if you are lucky too) ylegs are simply short.Thats why you may see 1.68m men pull of 14 cm of lengthening.
To bring this answer to an end keep your lengthening between 6-7cm nobody will ever say anything and love it. And if you want more bear in mind that those 4-5cm in your tibias won't hurt (only your wallet will xD)
Go for 6 or 7. I did this and I got really tight. That's with doing PT every day and doing at-home stretching. If someone goes to 10 they are changing the mechanics of their body that squatting down or leaning over, etc will become very odd. I could feel the difference at 7cm, so I couldn't imagine 10. Also, your tightness levels will be off the charts and some soft tissue damage may occur at 10. To answer the question, 6 looks great...8 looks acceptable. Go for lucky number 7.
Hey AllinStryde,
thanks for your answer! My surgery will be in a few weeks and my goal at the moment is indeed 6 or at most 7 cm. And even "only" 6 cm will push my Femur / tibia ratio to a level that does not occur in natural variation of femur / tibia ratio according to studies.
I am really glad that you guys consider my appearance at 6 cm growth as good looking, I was already thinking lengthening only one segment (Femur) by that amount will make me look awkward.
But I think most people won't notice the proportions.
Getting anxious, the operation is coming closer
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