I am looking at changing my Triban 5 frame for a new one (thinking along the lines of the top end alu frames, eg Canyon AL SLX, CAAD10 etc) but I have a few questions with determining frame sizing.
1) How much seatpost do you need to overlap the frame? How is this determined or is it a case of don't worry too much and buy the correct length for the frame? I am wanting to upgrade to a carbon post with the frame change.
2) I am thinking I will be ~56cm frame size, I have been sizing up bikes using a 100mm -6deg stem. Is that about the right size or should I be sizing up with a different size stem?
3) I guess headset spacers are best to keep to a range of 0-30mm to ensure not too much stiffness is lost by having too many spacers. Plus I do hate the look of lots of them.
I have been sizing up frames by comparing the distance between BB and handlebars to my current setup. This feels all ok to do as I won't be changing groupset or handlebars when upgrading the frame.