Can bikecad help me determine the distanse from the center of (frame-plan) the seattube to the braze-on/frontderailleur bolt mounting?
Or is there a simple trick to calculate this? In my case I use a shimano ultegra with a 43.5mm chainline and I need to know how far from the center of the frame-plan I have to intall the front derailleur braze-on bolt hole. A qualified guess is 25.0mm but it would be nice to know how to do this calculation incase the chainline changes.(diffrent crankset)
greetings from Slovenia