Originally Posted by
JonathanGennick
I hope this forum is a reasonable place to ask this question: what is the effect of seat tube angle on bike fit, and specifically on how much of a rider's weight lands forward onto the bars? Is the effect significant?
The reason I ask is that I have new bike that I'm trying to dial in, and I can't seem to adjust things in a way that avoids putting too much of my weight onto the bars. The bike in question has a 74-degree seat tube angle. My previous bikes have had 73 degree seat tube angles. Could that one degree be significant? Am I fighting the basic geometry of the bike that I'm trying to adjust?
The one degree difference results in less saddle setback relative to the BB, if you don't slide your saddle back. I use knee-over-pedal-spindle as my own starting point. As you slide back your center of gravity moves backwards.
I find percieved weight on the bars confusing. Once I set up my Woodrup, and felt hand pressure. I ended up moving my bars down a centimeter, and the hand pressure became really low. I figure the bar now is where my hands want to be, and the higher bar was "in their way."