Originally Posted by FarHorizon
The bike shop fit me to both bikes by measuring foot angle to the ground at full leg extension and knee over pedal spindle by a drop weight. Wouldn't the combo of these two measurements eliminate any differences in tube angles?
Yes, as much as can be eliminated. However, like in the case of my different sized bikes, you
may be more or less stretched out to the h'bars. This can rotate your pelvis forward onto the peak. My 830 is an inch longer in the top tube than the 520. I can't really slide the saddle too much more forward or I'll be off of KOP too much. An inch is alot. So, I use an adjustable stem to bring the bars up and back a little. Keeps my sitbones where they should be. It's worth it to use the same great saddles on both bikes.