Originally Posted by
dobber
Top tube length is more relevant than frame size.
But based simply on what you've provided, I'd hazard the opinion that you need a longer stem to compensate for a smaller frame.
A factor to consider is that as one elevates the stem, the cockpit length is effectively shortened.
Yes and no. Why do I need a longer stem? Why do you think my frame is small for me?
I hear this all the time about TT being more relevant. It depends a lot more on the individual and their style. Not like the old days. Why TT is perfect, but you need to have you seat all the way doen to the frame.
Lets start with my Madison. Its a SM frame according to Schwinn. because of the TRACK geomerty, the TT is short and shorter than I prefer. The MED would give me a TT of 545.2mm which would be also most a match for my Road bike. But the stand over 31.4. My cycling inseam with the junk crushed is 31.2. Basically the frame is too tall for me, but the appropriate TT.
To get the same position on my road bike, I need a 135-140mm stem. Too long for my likening. Because the the frame Geo, I am too far forward over the front wheel.
This is also why on my road bike, I prefer a compact geo and ride a MD/LG frame. I had a SCOTT which was not compact but semi sloping and went with the TT measurment. It was on a MED frame and a 54.2TT. With a 110-120 stem I was fine. But guess what? I had no clearance. The Stand over was 31.5.
So yes, TT is the first thing one should look for. But SO and ST angle and HT angle play a HUGE part.
Sees like most of you guys never road a bike before your tarck bikes and have zero idea about fit. Too many hipsters using 70mm stems and all crunched up. But you look cool, right?
Yes, I have been fitted many times now and I am in the process of learning fitting myself. I have fitted several riders so far and so goo.
Same with another poster telling the guy here that his leg should almost being locked out at the bottom. False! Most riders have the highest Power output in the 15-25 degree range.
back you quote. my 50cm Kilo gives me a 1/2-1" clearnce. I do ride more up right on this bike. with flat bars I use a 120mm stem. To get to my optimal position, I need 140mm stem! Next size Kilo, TT right but ZERO stand over. Track geo and higher BB force more riders to go a size down.