Originally Posted by
GV27
You're the one that said he definitely shouldn't slide his seat back relative to how he has it on his current frame. "Horrible advice" is what you said. I didn't say he should or shouldn't just gave it as an option to try. You're the one who said it wasn't an option.
I don't think you are understanding me or in general bike fit.
Here is what I had posted.
They sell seatposts with different geometries and seats that can be slid fore and aft so that a rider can find his/her correct/comfortable position as it relates to the BB and therefore cranks and pedals. Sliding your seat back to lengthen your theoretical top tube length is horrible advice, as pete pointed out and luckily the OP was aware of.
He should find his optimal saddle position on his new frame based on his position as it relates to the pedals. He knows this as he points out in post 11.
He should not adjust his saddle positon from there (either with a setback seatpost or sliding his seat back)to increase his theoretical top tube length (especially if he has finnicky knees) as you had advised as an option
Kapish?